WO2022172541A1 - Cable monitoring device, management device, cable monitoring system, and cable monitoring method - Google Patents

Cable monitoring device, management device, cable monitoring system, and cable monitoring method Download PDF

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Publication number
WO2022172541A1
WO2022172541A1 PCT/JP2021/041881 JP2021041881W WO2022172541A1 WO 2022172541 A1 WO2022172541 A1 WO 2022172541A1 JP 2021041881 W JP2021041881 W JP 2021041881W WO 2022172541 A1 WO2022172541 A1 WO 2022172541A1
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WIPO (PCT)
Prior art keywords
cable
cable monitoring
monitoring device
unit
partial discharge
Prior art date
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PCT/JP2021/041881
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French (fr)
Japanese (ja)
Inventor
横山大
下口剛史
Original Assignee
住友電気工業株式会社
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Priority to JP2022581190A priority Critical patent/JPWO2022172541A1/ja
Publication of WO2022172541A1 publication Critical patent/WO2022172541A1/en

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
    • G01R29/18—Indicating phase sequence; Indicating synchronism
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/08—Locating faults in cables, transmission lines, or networks
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/58—Testing of lines, cables or conductors
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/46—Monitoring; Testing

Definitions

  • the present disclosure relates to a cable monitoring device, a management device, a cable monitoring system and a cable monitoring method.
  • This application claims priority based on Japanese Patent Application No. 2021-21530 filed on February 15, 2021, and incorporates all of its disclosure herein.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 2013-217870 discloses the following accident point locating device. That is, the accident point locating device is disposed so as to loop inside each end portion of the underground cable that constitutes the section, and one end is connected to the end portion of the underground cable and the other end is grounded. A plurality of photocurrent sensors that detect and output the current generated at the accident point through a grounding wire, and the output signal of each of the photocurrent sensors that is input via the optical fiber transmission line is used by a low-pass filter to obtain a commercial signal.
  • a commercial frequency component detector for extracting and outputting fault current in a frequency band, wherein the commercial frequency component detector is extracted from the output signal of a photocurrent sensor disposed inside both terminal portions of each section;
  • a fault zone detector for detecting fault zones based on periodic fault currents; It has a surge current component detector that extracts and outputs a surge current, and the surge current component detector is based on the surge current extracted from the output signal of a photocurrent sensor disposed inside both terminal portions of each section.
  • an accident point detection unit having an accident point locating unit for locating an accident point distance, which is accident point information, by calculating the time difference between when the surge current reaches each photocurrent sensor.
  • Patent Document 2 International Publication No. 2016/079869 discloses the following partial discharge positioning device. That is, the partial discharge position locating device is a partial discharge locating device capable of locating the position of the partial discharge generated in the gas insulated equipment to which the power cable is connected or in the power cable, and is attached to the gas insulated equipment. a first sensor capable of detecting a partial discharge signal; a second sensor attached to the power cable and capable of detecting the partial discharge signal; and a detection time of the partial discharge signal by the first sensor. a time difference detection unit for detecting a time difference between a time at which the partial discharge signal is detected by the second sensor; and the time difference detected by the time difference detection unit and the partial discharge signal in the gas-insulated equipment. and a processing unit for locating the generation position of the partial discharge based on the propagation speed of the partial discharge signal and the propagation speed of the partial discharge signal in the power cable.
  • a cable monitoring device monitors a cable having a linear conductor that transmits electric power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer.
  • a signal detection unit that outputs an output signal corresponding to a change in the current flowing through the shielding layer or a change in the potential of the shielding layer; and based on the output signal output from the signal detection unit, the an anomaly detector for detecting partial discharge and dielectric breakdown in the cable;
  • the management device of the present disclosure monitors a cable having a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer.
  • a plurality of pieces of first detection information respectively indicating times at which a plurality of installed cable monitoring devices detected partial discharge in the cable, and a plurality of pieces of information indicating times at which the plurality of cable monitoring devices detected a dielectric breakdown in the cable.
  • an acquisition unit that acquires second detection information; a first calculation unit that calculates the occurrence position of the partial discharge in the cable based on each of the first detection information acquired by the acquisition unit; and a second calculator that calculates a location where the dielectric breakdown occurs in the cable based on the obtained second detection information.
  • a cable monitoring system of the present disclosure monitors a cable having a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer.
  • a plurality of cable monitoring devices installed in the cable; a plurality of first detection information indicating times at which the plurality of cable monitoring devices detect partial discharge in the cable; and a management device that acquires a plurality of pieces of second detection information each indicating a time at which the partial discharge is detected, and the management device determines the generation position of the partial discharge in the cable based on each of the acquired first detection information. Based on each of the calculated and acquired second detection information, a position where the dielectric breakdown occurs in the cable is calculated.
  • a cable monitoring method of the present disclosure is a cable monitoring method in a cable monitoring system including a plurality of cable monitoring devices installed at mutually different positions and a management device, wherein the plurality of cable monitoring devices transmit power.
  • One aspect of the present disclosure can be implemented not only as a cable monitoring device including such a characteristic processing unit, but also as a semiconductor integrated circuit that implements part or all of the cable monitoring device, or as a cable monitoring device. It can be realized as a method having steps of processing in the device, or as a program for causing a computer to execute the steps of processing in the cable monitoring device.
  • one aspect of the present disclosure can be implemented not only as a management device including such a characteristic processing unit, but also as a semiconductor integrated circuit that implements part or all of the management device, or as a management device. or as a program for causing a computer to execute the steps of the processing in the management apparatus.
  • one aspect of the present disclosure can be implemented not only as a cable monitoring system including such a characteristic processing unit, but also as a semiconductor integrated circuit that implements part or all of the cable monitoring system, It can be implemented as a program for causing a computer to execute processing steps in the cable monitoring system.
  • FIG. 1 is a diagram showing the configuration of a power transmission system according to an embodiment of the present disclosure.
  • FIG. 2 is a diagram illustrating an example of a configuration of an underground cable used in a power transmission system according to an embodiment of the present disclosure;
  • FIG. 3 is a diagram illustrating an example of a connection method of an underground cable in a normal connection section used in the power transmission system according to the embodiment of the present disclosure.
  • FIG. 4 is a diagram illustrating an example of a connection method of an underground cable at an insulated joint used in the power transmission system according to the embodiment of the present disclosure.
  • FIG. 5 is a diagram illustrating another example of a connection method of an underground cable at an insulated joint used in the power transmission system according to the embodiment of the present disclosure.
  • FIG. 1 is a diagram showing the configuration of a power transmission system according to an embodiment of the present disclosure.
  • FIG. 2 is a diagram illustrating an example of a configuration of an underground cable used in a power transmission system according to an embodiment of the present disclosure;
  • FIG. 6 is a diagram showing the configuration of the cable monitoring system according to the embodiment of the present disclosure.
  • FIG. 7 is a diagram showing the configuration of the cable monitoring device according to the embodiment of the present disclosure.
  • FIG. 8 is a diagram showing the configuration of CT in the cable monitoring device according to the embodiment of the present disclosure.
  • FIG. 9 is a diagram showing a configuration of a cable monitoring device according to a modification of the embodiment of the present disclosure;
  • FIG. 10 is a diagram showing an example of attachment of metal foil electrodes in the cable monitoring device according to the embodiment of the present disclosure.
  • FIG. 11 is a diagram illustrating an example of a configuration of an abnormality detection unit in the cable monitoring device according to the embodiment of the present disclosure.
  • FIG. 12 is a diagram illustrating a configuration of a management device according to an embodiment of the present disclosure
  • FIG. 13 is a diagram illustrating an example of positions where partial discharges occur in the power transmission system according to the embodiment of the present disclosure.
  • FIG. 14 is a diagram illustrating a configuration of an abnormality detection unit according to a modification of the embodiment of the present disclosure
  • FIG. 15 is a diagram illustrating a configuration of an abnormality detection unit according to a modification of the embodiment of the present disclosure
  • 16 is a diagram illustrating an example of an output signal received by an ADC in the cable monitoring device according to the embodiment of the present disclosure
  • FIG. 17 is a diagram illustrating an example of an output signal received by an ADC in the cable monitoring device according to the embodiment of the present disclosure
  • FIG. 18 is a flow chart defining an example of an operation procedure when the cable monitoring device according to the embodiment of the present disclosure detects partial discharge and dielectric breakdown.
  • FIG. 19 is a diagram illustrating an example of a sequence of determination processing in the cable monitoring system according to the embodiment of the present disclosure.
  • Patent Document 1 cannot detect partial discharge in a cable.
  • Patent Document 2 cannot detect dielectric breakdown in the cable.
  • the present disclosure has been made to solve the above problems, and its object is to provide a cable monitoring device, a management device, and a cable monitoring device capable of realizing excellent functions related to detection of partial discharge and dielectric breakdown in cables. To provide a system and cable monitoring method.
  • a cable monitoring device includes a linear conductor that transmits electric power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer.
  • both partial discharge and dielectric breakdown in the cable are detected with a simple configuration, thereby detecting partial discharge and dielectric breakdown in the cable. be able to. Therefore, excellent functionality for detecting partial discharges and dielectric breakdowns in cables can be achieved.
  • the abnormality detection section may distinguish between the partial discharge and the dielectric breakdown based on a comparison result between the level of the output signal and a predetermined threshold value.
  • the abnormality detection section may distinguish between the partial discharge and the dielectric breakdown based on the waveform of the output signal.
  • the abnormality detection unit detects the partial discharge based on the output signal that has passed through a high-pass filter that attenuates components below a predetermined frequency, and detects the partial discharge based on the output signal that has not passed through the high-pass filter.
  • the dielectric breakdown may be detected.
  • the cable monitoring device may further include a notification unit that notifies another device of the time at which the abnormality detection unit detected the partial discharge.
  • the cable monitoring device may further include a notification unit that notifies another device of the time at which the abnormality detection unit detects the dielectric breakdown.
  • the cable monitoring device further includes a synchronization unit that performs processing for synchronizing time with the other cable monitoring device through communication with the other cable monitoring device that monitors the cable.
  • a management device includes a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer.
  • a plurality of first detection information indicating times when a plurality of cable monitoring devices installed at mutually different positions for monitoring a cable detect partial discharge in the cable; an acquisition unit configured to acquire a plurality of pieces of second detection information each indicating a detection time; a calculator; and a second calculator that calculates a location where the dielectric breakdown occurs in the cable based on each of the second detection information acquired by the acquirer.
  • the occurrence position of partial discharge is calculated based on the partial discharge detection time in a plurality of cable monitoring devices capable of detecting both partial discharge and insulation breakdown, and the dielectric breakdown detection time in the plurality of cable monitoring devices is calculated.
  • a cable monitoring system includes a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer.
  • a plurality of cable monitoring devices installed at different positions for monitoring the cables, a plurality of first detection information indicating times when the plurality of cable monitoring devices detected partial discharge in the cables, and the plurality of cables a management device that acquires a plurality of pieces of second detection information each indicating a time at which a monitoring device detects a dielectric breakdown in the cable; and the management device acquires the cable based on the acquired first detection information. , and based on each of the acquired second detection information, calculate the position of occurrence of the dielectric breakdown in the cable.
  • the occurrence position of partial discharge is calculated based on the partial discharge detection time in a plurality of cable monitoring devices capable of detecting both partial discharge and insulation breakdown, and the dielectric breakdown detection time in the plurality of cable monitoring devices is calculated.
  • the configuration for calculating the dielectric breakdown occurrence position based on it is possible to locate both the partial discharge occurrence position and the dielectric breakdown occurrence position with a simple configuration. Therefore, excellent functionality for detecting partial discharges and dielectric breakdowns in cables can be achieved.
  • a cable monitoring method is a cable monitoring method in a cable monitoring system including a plurality of cable monitoring devices installed at mutually different positions and a management device, wherein the plurality of cables a monitoring device monitoring a cable having a linear conductor that transmits electric power, an insulating layer surrounding the conductor, and a shielding layer that is a conductor surrounding the insulating layer; a step of acquiring a plurality of first detection information respectively indicating times when the plurality of cable monitoring devices detected partial discharge in the cable; acquiring a plurality of pieces of second detection information each indicating a detection time; and calculating, by the management device, the location where the partial discharge occurs in the cable based on the acquired pieces of the first detection information. and calculating, by the management device, the location where the dielectric breakdown occurs in the cable based on the obtained second detection information.
  • the occurrence position of partial discharge is calculated based on the partial discharge detection time in a plurality of cable monitoring devices capable of detecting both partial discharge and insulation breakdown, and the dielectric breakdown detection time in the plurality of cable monitoring devices is calculated.
  • Both the partial discharge occurrence position and the dielectric breakdown occurrence position can be located by a simple method by the method of calculating the dielectric breakdown occurrence position based on the above. Therefore, excellent functionality for detecting partial discharges and dielectric breakdowns in cables can be achieved.
  • FIG. 1 is a diagram showing the configuration of a power transmission system according to an embodiment of the present disclosure.
  • power transmission system 502 includes underground cables 10A, 10B, 10C, normal connections 41A, 41B, insulated connections 42A, 42B, 42C, and ground connections 43A, 43B.
  • each of the underground cables 10A, 10B, and 10C is also referred to as the underground cable 10
  • each of the normal connection portions 41A and 41B is also referred to as a normal connection portion 41
  • each of the insulated connection portions 42A, 42B, and 42C is referred to as an insulated connection portion.
  • 42 and each of the ground connection portions 43 A and 43 B is also referred to as a ground connection portion 43 .
  • At least a portion of transmission system 502 is provided, for example, in an underground portion of the power system.
  • the ground connection section 43 includes cable terminals 11A, 11B, and 11C.
  • the underground cable 10 is connected to the cable terminals 11A, 11B and 11C at the ground connection portion 43 . More specifically, underground cable 10A is connected to cable terminal 11A, underground cable 10B is connected to cable terminal 11B, and underground cable 10C is connected to cable terminal 11C.
  • the ground connection part 43 is provided, for example, in a substation where the underground cable 10 appears on the ground.
  • the normal connection portion 41 and the insulated connection portion 42 are provided inside the manhole 31 .
  • FIG. 2 is a diagram showing an example of the configuration of underground cables used in the power transmission system according to the embodiment of the present disclosure.
  • FIG. 2 shows a cross-sectional view of underground cable 10 .
  • underground cable 10 includes, in order from the center, a linear conductor 71 that transmits electric power, an internal semiconductive layer 72 made of semiconductive ethylene propylene (EP) rubber, and an insulating layer. It consists of an insulator 73 made of EP rubber which is a layer, an outer semiconductive layer 74 which is a semiconductive tape, a conductive shielding layer 75 and a sheath 76 made of vinyl.
  • EP semiconductive ethylene propylene
  • the inner semiconducting layer 72 surrounds the conductor 71
  • the insulator 73 surrounds the inner semiconducting layer 72
  • the outer semiconducting layer 74 surrounds the insulator 73
  • the shielding layer 75 which is a conductor Surrounding the outer semi-conducting layer 74 is a sheath 76 surrounding the shielding layer 75 .
  • a conductor 71 in the underground cable 10 is used for power transmission and is applied with a high voltage.
  • the shielding layer 75 is electrically conductive while being grounded in the middle of the underground cable 10 . Therefore, the voltage on shield layer 75 is lower than on conductor 71 .
  • a 3-phase 3-wire system is used as a power distribution system.
  • underground cables 10A, 10B, and 10C are provided as three-phase underground cables 10.
  • FIG. 10A, 10B, and 10C are provided as three-phase underground cables 10.
  • the shielding layers 75 of the underground cables 10A, 10B and 10C are exposed at the cable terminals 11A, 11B and 11C. Terminals are provided in the exposed portions of these shielding layers 75, respectively.
  • the underground cables 10A, 10B, 10C are connected to the ground node 15 at cable terminals 11A, 11B, 11C, respectively. More specifically, the shielding layer 75 of each underground cable 10 is grounded by connecting the terminal provided to each of the underground cables 10A, 10B, 10C to the ground node 15 via the grounding cable 14 or the like. be.
  • the underground cable 10 is composed of a plurality of cables whose ends are connected to each other at normal connection portions 41 and insulated connection portions 42 .
  • FIG. 3 is a diagram showing an example of a connection method of underground cables in a normal connection section used in the power transmission system according to the embodiment of the present disclosure.
  • FIG. 3 mainly shows the conductor 71 and the shielding layer 75 of the underground cable 10A for ease of explanation. The contents described below are the same for the underground cable 10B and the underground cable 10C.
  • underground cables 10A1 and 10A2 are connected at a normal connection portion 41.
  • the shielding layer 75 of the underground cables 10A1 and 10A2 is exposed at the connection portion between the conductors 71 of the underground cables 10A1 and 10A2.
  • shielding layer 75 of underground cable 10A1 and shielding layer 75 of underground cable 10A2 are connected using conductive wire 12, for example.
  • the terminal 81 is provided at the exposed portion of the shielding layer 75 of the underground cable 10A2, for example. Note that the terminal 81 may be provided at an exposed portion of the shielding layer 75 of the underground cable 10A1. By connecting the terminal 81 to the ground node 13 via a cable or the like, the shielding layer 75 of the underground cable 10A is grounded.
  • FIG. 4 is a diagram showing an example of a connection method of an underground cable at an insulated joint used in the power transmission system according to the embodiment of the present disclosure.
  • FIG. 4 mainly shows the conductor 71 and the shielding layer 75 of the construction of the underground cable 10A for ease of explanation. The contents described below are the same for the underground cable 10B and the underground cable 10C.
  • underground cables 10A1 and 10A2 are connected at the insulated connection portion 42 .
  • the shielding layers 75 of the underground cables 10A1 and 10A2 are exposed at the connecting portions between the conductors 71 of the underground cables 10A1 and 10A2, and the terminals 81 and the like are provided at the exposed portions.
  • the terminal 81 of the underground cable 10A1 and the terminal 81 of the underground cable 10A2 are connected using the wire 12.
  • the wiring connects the shielding layer 75 of the underground cable 10A1 and the shielding layer 75 of the underground cable 10A2.
  • FIG. 5 is a diagram showing another example of a connection method of underground cables in the insulated joints used in the power transmission system according to the embodiment of the present disclosure.
  • underground cables 10A1 and 10A2 are connected, underground cables 10B1 and 10B2 are connected, and underground cables 10C1 and 10C2 are connected at insulating connection portion 42 .
  • the shielding layer 75 of the underground cables 10A1 and 10A2 is exposed at the connection portion between the conductors 71 of the underground cables 10A1 and 10A2, and at the connection portion between the conductors 71 of the underground cables 10B1 and 10B2
  • the shielding layers 75 of the underground cables 10B1 and 10B2 are exposed, the shielding layers 75 of the underground cables 10C1 and 10C2 are exposed at the connecting portions between the conductors 71 of the underground cables 10C1 and 10C2, and the terminals 81 and the like are provided at the exposed portions. be provided.
  • the shielding layer 75 of the underground cable 10A1 and the shielding of the underground cable 10B2 are connected.
  • Shielding layer 75 of underground cable 10B1 and shielding layer 75 of underground cable 10C2 are connected by connecting terminal 81 of underground cable 10B1 and terminal 81 of underground cable 10C2 using wire 12. are connected, and by connecting the terminal 81 of the underground cable 10C1 and the terminal 81 of the underground cable 10A2 using the wire 12, the shielding layer 75 of the underground cable 10C1 and the shielding layer 75 of the underground cable 10A2 are Connected.
  • the underground cable 10 may be cross-bonded at the insulated connection portion 42 .
  • FIG. 6 is a diagram showing the configuration of the cable monitoring system according to the embodiment of the present disclosure.
  • FIG. 6 mainly shows an underground cable 10A of the underground cables 10 for ease of explanation. The contents described below are the same for the underground cable 10B and the underground cable 10C.
  • the cable monitoring system 501 includes cable monitoring devices 500A, 500B, 500C, and 500D and a management device 400. Each of the cable monitoring devices 500A, 500B, 500C, and 500D is also referred to as a cable monitoring device 500 hereinafter. Cable monitoring system 501 is used in transmission system 502 .
  • the cable monitoring devices 500 are installed at different positions.
  • Cable monitoring device 500 is provided, for example, corresponding to insulated connection portion 42 and ground connection portion 43 .
  • the cable monitoring device 500A is provided corresponding to the insulating connection portion 42A
  • the cable monitoring device 500B is provided corresponding to the insulating connection portion 42B
  • the cable monitoring device 500C is provided corresponding to the insulating connection portion 42B
  • the insulated connection portion 42C, and the cable monitoring device 500D is provided corresponding to the ground connection portion 43A.
  • the management device 400 is also connected to a cable monitoring device 500D.
  • the cable monitoring device 500 monitors the underground cable 10A, which is an example of a cable to be monitored. More specifically, the four cable monitoring devices 500 monitor the underground cable 10A in the vicinity of the installation position. The cable monitoring device 500 detects partial discharge and dielectric breakdown in the underground cable 10A by monitoring the underground cable 10A. Note that the monitoring target of the cable monitoring device 500 is not limited to underground cables, and may be cables provided in places other than underground.
  • the cable monitoring devices 500 can communicate with each other via the underground cable 10A by inductive coupling with the shielding layer 75 of the underground cable 10A.
  • the cable monitoring device 500 can perform communication up to a distance of several kilometers at a variable transmission rate of 20 kbps to 130 kbps using, for example, a low-frequency PLC (Power Line Communication) used for communication such as a smart meter.
  • a low-frequency PLC Power Line Communication
  • the cable monitoring device 500 can use a high frequency PLC to communicate over shorter distances at transmission speeds up to 200 Mbps.
  • the cable monitoring device 500 notifies the management device 400 of the partial discharge detection result in the underground cable 10A. Also, for example, the cable monitoring device 500 notifies the management device 400 of the detection result of dielectric breakdown in the underground cable 10A.
  • the cable monitoring device 500 can relay the notification of the detection result from the other cable monitoring device 500 to the other cable monitoring device 500 or the management device 400 .
  • cable monitoring devices 500A, 500B, and 500C notify management device 400 of detection results via other cable monitoring devices 500 including cable monitoring device 500D. Also, for example, the cable monitoring device 500D directly notifies the management device 400 of the detection result.
  • the management device 400 calculates the position of occurrence of partial discharge in the underground cable 10A, that is, locates the position of occurrence of partial discharge. In addition, the management device 400 calculates the occurrence position of the insulation breakdown in the underground cable 10A based on the detection result of the insulation breakdown notified from the cable monitoring device 500, that is, locates the occurrence position of the insulation breakdown.
  • a power coil is attached to the underground cable 10A.
  • An induced current due to the current flowing through the conductor 71 of the underground cable 10 flows through the power supply coil. This allows the power coil to draw current.
  • Cable monitoring device 500 operates by power obtained by, for example, a power supply coil.
  • FIG. 7 is a diagram showing the configuration of the cable monitoring device according to the embodiment of the present disclosure.
  • cable monitoring device 500 includes signal detection section 100 , abnormality detection section 200 , electromagnetic coupling section 300 , communication section 331 , synchronization section 332 and counter 333 .
  • Communication unit 331 is an example of a notification unit.
  • Signal detection section 100 includes a current transformer 110 and a signal output section 120 .
  • Electromagnetic coupling section 300 includes a current transformer 310 and a signal input/output section 320 .
  • the current transformer 110 is also referred to as CT110
  • the current transformer 310 is also referred to as CT310.
  • the counter 333 counts clock pulses generated by, for example, an oscillator circuit using a crystal oscillator, and holds time information indicating the counted value. This time information indicates, for example, the current time.
  • the signal detection unit 100 and the electromagnetic coupling unit 300 are electromagnetically coupled with the shielding layer 75 at the insulating connection unit 42, which is the connection portion of the underground cable 10A, for example.
  • the signal detection unit 100 outputs an output signal according to changes in current flowing through the shielding layer 75 of the underground cable 10A. More specifically, the signal detection unit 100 outputs to the abnormality detection unit 200 an output signal that is an analog signal corresponding to the induced current of the current flowing through the shielding layer 75 of the underground cable 10 .
  • the abnormality detection section 200 detects partial discharge and dielectric breakdown in the underground cable 10A based on the output signal output from the signal detection section 100. More specifically, based on the output signal received from the signal detection unit 100, the abnormality detection unit 200 performs determination processing to determine whether partial discharge and dielectric breakdown have occurred in the underground cable 10A. For example, when detecting partial discharge in the underground cable 10A, the abnormality detection unit 200 outputs detection information DA including the partial discharge detection time and the ID of the own cable monitoring device 500 to the communication unit 331 .
  • the abnormality detection section 200 when detecting a dielectric breakdown in the underground cable 10 ⁇ /b>A, the abnormality detection section 200 outputs a detection information DB including the dielectric breakdown detection time and the ID of its own cable monitoring device 500 to the communication section 331 .
  • Detection information DA is an example of first detection information.
  • the detection information DB is an example of second detection information.
  • the communication unit 331 can transmit and receive communication information between the other cable monitoring devices 500 using the induced current flowing through the shielding layer 75 due to the electromagnetic coupling of the electromagnetic coupling unit 300 .
  • the communication unit 331 in the cable monitoring device 500D is connected to the management device 400 via a communication line (not shown).
  • the communication unit 331 in the cable monitoring device 500D relays communication information received from another cable monitoring device 500 to the management device 400 via the communication line.
  • the communication unit 331 in the cable monitoring device 500D is a master station in PLC communication
  • the communication units 331 in the cable monitoring devices 500A, 500B, and 500C are slave stations in PLC communication.
  • the communication unit 331 notifies another device, such as the management device 400, of the time when the abnormality detection unit 200 detects partial discharge. Further, the communication unit 331 notifies another device, for example, the management device 400 of the time when the abnormality detection unit 200 detects insulation discharge. More specifically, the communication unit 331 receives the detection information DA from the abnormality detection unit 200 and transmits the received detection information DA via the communication line or through the other cable monitoring devices 500 including the cable monitoring device 500D and the communication device 500D. It transmits to the management device 400 via a line.
  • the communication unit 331 receives the detection information DB from the abnormality detection unit 200, and transmits the received detection information DB via the communication line, or via other cable monitoring devices 500 including the cable monitoring device 500D and the communication line. It transmits to the management device 400 .
  • the detection information DA and DB are examples of communication information.
  • FIG. 8 is a diagram showing the configuration of CT in the cable monitoring device according to the embodiment of the present disclosure.
  • CT 110 includes ring core 101 and winding 102 .
  • a winding 102 is wound around the ring core 101 .
  • Winding 102 is connected to signal output section 120 .
  • the number of turns of winding 102 in ring core 101 is, for example, 3 to 7 turns.
  • the CT 110 is attached so that the conductive cable 53 penetrates the ring core 101, for example.
  • Conductive cable 53 is, for example, wire 12 or grounding cable 14 .
  • the CTs 110 of the cable monitoring devices 500A, 500B, 500C at the insulated connections 42A, 42B, 42C are connected to the shield layer 75 of underground cable 10A1 and underground cable 10A2.
  • a wire 12 connecting the shielding layers 75 of the ring core 101 is attached so as to pass through the ring core 101 .
  • the CT 110 of the cable monitoring device 500D in the ground connection portion 43A is attached so that the grounding cable 14 penetrates the ring core 101.
  • inductive coupling causes an induced current to flow through winding 102 .
  • Signal output section 120 outputs an output signal corresponding to the induced current flowing through winding 102 to abnormality detection section 200 .
  • CT 310 also includes ring core 301 and winding 302 .
  • a winding 302 is wound around the ring core 301 .
  • Winding 302 is connected to signal input/output section 320 .
  • the number of turns of winding 302 in ring core 301 is, for example, 3 to 7 turns.
  • the CT 310 is attached so that the conductive cable 53 penetrates the ring core 301, for example. More specifically, in the CTs 310 of the cable monitoring devices 500A, 500B, and 500C in the insulated connection portions 42A, 42B, and 42C, the wire 12 connecting the shield layer 75 of the underground cable 10A1 and the shield layer 75 of the underground cable 10A2 is a ring core. It is attached so as to pass through 301 . Also, the CT 310 of the cable monitoring device 500D in the ground connection portion 43A is attached so that the grounding cable 14 penetrates the ring core 301. As shown in FIG. Note that the sizes of the CTs 110 and 310 may be the same or different.
  • the communication unit 331 generates a transmission signal including communication information to be transmitted to the other cable monitoring device 500 or the management device 400 and outputs the generated transmission signal to the electromagnetic coupling unit 300.
  • the signal input/output unit 320 receives a transmission signal from the communication unit 331 and causes a current corresponding to the received transmission signal to flow through the winding 302 .
  • inductive coupling causes an induced current to flow through conductive cable 53 and shield layer 75 .
  • the induced current that flows through the shielding layer 75 when the signal input/output unit 320 causes the current to flow through the winding 302 is also referred to as a communication induced current.
  • Signal input/output unit 320 outputs a reception signal, which is an analog signal corresponding to the induced current flowing through winding 102 , to communication unit 331 .
  • the communication unit 331 acquires communication information from another cable monitoring device 500 from the received signal received from the signal input/output unit 320 .
  • the band of the communication induced current used by the communication unit 331 to transmit and receive communication information differs from the band of the output signal used by the abnormality detection unit 200 to detect partial discharge and dielectric breakdown. Therefore, the communication unit 331 and the abnormality detection unit 200 can transmit communication information and detect partial discharge and dielectric breakdown in parallel. In addition, even when dielectric breakdown occurs in the underground cable 10A, the communication unit 331 can transmit communication information, for example, in a state in which the shielding layer 75 is not completely cut.
  • FIG. 9 is a diagram showing the configuration of a cable monitoring device according to a modification of the embodiment of the present disclosure.
  • cable monitoring device 510 includes a signal detection unit 100A, an abnormality detection unit 200, an electromagnetic coupling unit 300, a communication unit 331, a synchronization unit 332, and a counter 333.
  • Cable monitoring system 501 may be configured to include cable monitoring device 510 instead of cable monitoring device 500 .
  • the signal detection unit 100A outputs an output signal according to the change in potential of the shielding layer 75 of the underground cable 10. More specifically, signal detection section 100A includes metal foil electrodes 105 and 106 and signal output section 120A. The signal detection unit 100A is electrostatically coupled to the shield layer 75 at the insulating connection portion 42, which is the connection portion of the underground cable 10, for example.
  • FIG. 10 is a diagram showing an example of attachment of metal foil electrodes in the cable monitoring device according to the embodiment of the present disclosure. 9 and 10, metal foil electrodes 105 and 106 are connected to signal output section 120A.
  • the metal foil electrodes 105 and 106 are attached to the surface of the sheath 76 of the underground cable 10 on opposite sides of the insulating connection portion 42 via the insulating cylinder 77 . More specifically, for example, at the insulating connection portion 42 to which the underground cables 10A1 and 10A2 are connected, the metal foil electrode 105 is attached to the surface of the sheath 76 of the underground cable 10A1, and the metal foil electrode 106 is attached to the surface of the sheath 76 of the underground cable 10A1. It is attached to the surface of the sheath 76 of the cable 10A2. Note that the metal foil electrodes 105 and 106 may be attached so as to cover the outer circumference of the sheath 76 of the underground cable 10A2. Moreover, the position to which each metal foil electrode is attached and the number of metal foil electrodes are not limited, and three or more metal foil electrodes may be attached.
  • the signal output unit 120A outputs to the abnormality detection unit 200 an output signal, which is an analog signal corresponding to the change in the potential of the shielding layer 75 based on the current.
  • synchronization unit 332 performs processing for synchronizing time with another cable monitoring device 500 that monitors underground cable 10A through communication with other cable monitoring device 500. . More specifically, the synchronizing unit 332 periodically performs a synchronizing process for synchronizing the time information of the counter 333 with that of another cable monitoring device 500 .
  • the cable monitoring device 500D functions as a master device.
  • Synchronization section 332 in cable monitoring device 500 ⁇ /b>D acquires the time information of counter 333 and outputs the acquired time information to communication section 331 at synchronization processing timing according to a predetermined cycle.
  • the communication unit 331 in the cable monitoring device 500D receives the time information from the synchronization unit 332 and transmits the received time information to the cable monitoring device 500A.
  • Time information is an example of communication information.
  • the communication unit 331 receives time information from the communication unit 331 in the cable monitoring device 500D via the electromagnetic coupling unit 300, and outputs the received time information to the synchronization unit 332.
  • Synchronization unit 332 updates the time information of counter 333 to the time information received from communication unit 331 .
  • the synchronization unit 332 also acquires time information after the counter 333 is updated, and outputs the acquired time information to the communication unit 331 .
  • the communication unit 331 receives time information from the synchronization unit 332 and transmits the received time information to the cable monitoring devices 500D and 500B.
  • the communication unit 331 receives time information from the communication unit 331 in the cable monitoring device 500A via the electromagnetic coupling unit 300, and outputs the received time information to the synchronization unit 332.
  • Synchronization unit 332 updates the time information of counter 333 to the time information received from communication unit 331 .
  • the synchronization unit 332 also acquires time information after the counter 333 is updated, and outputs the acquired time information to the communication unit 331 .
  • Communication unit 331 receives the time information from synchronization unit 332 and transmits the received time information to cable monitoring devices 500A and 500C.
  • the communication unit 331 receives time information from the communication unit 331 in the cable monitoring device 500B via the electromagnetic coupling unit 300, and outputs the received time information to the synchronization unit 332.
  • Synchronization unit 332 updates the time information of counter 333 to the time information received from communication unit 331 .
  • the synchronization unit 332 also acquires time information after the counter 333 is updated, and outputs the acquired time information to the communication unit 331 .
  • the communication unit 331 receives the time information from the synchronization unit 332 and transmits the received time information to the cable monitoring device 500B.
  • the communication unit 331 in the cable monitoring device 500D receives time information from the communication unit 331 in the cable monitoring device 500A via the electromagnetic coupling unit 300, and 1/ of the difference between the received time information and the current time information of the counter 333. 2 is calculated.
  • the difference indicates the round-trip transmission delay time between the cable monitoring device 500D and the cable monitoring device 500A, and 1/2 of the difference indicates the transmission delay time between the cable monitoring device 500D and the cable monitoring device 500A.
  • the communication unit 331 in the cable monitoring device 500 ⁇ /b>D transmits delay time information D ⁇ b>1 indicating the calculated transmission delay time to the management device 400 .
  • the communication unit 331 in the cable monitoring device 500A receives the time information from the communication unit 331 in the cable monitoring device 500B via the electromagnetic coupling unit 300, and calculates the difference between the received time information and the current time information of the counter 333. Calculate 1/2.
  • the difference indicates the round-trip transmission delay time between the cable monitoring device 500A and the cable monitoring device 500B, and 1/2 of the difference indicates the transmission delay time between the cable monitoring device 500A and the cable monitoring device 500B.
  • the communication unit 331 in the cable monitoring device 500A transmits delay time information D2 indicating the calculated transmission delay time to the management device 400 via the cable monitoring device 500D.
  • the communication unit 331 in the cable monitoring device 500B receives time information from the communication unit 331 in the cable monitoring device 500C via the electromagnetic coupling unit 300, and calculates the difference between the received time information and the current time information of the counter 333. Calculate 1/2.
  • the difference indicates the round-trip transmission delay time between the cable monitoring device 500B and the cable monitoring device 500C, and 1/2 of the difference indicates the transmission delay time between the cable monitoring device 500B and the cable monitoring device 500C.
  • the communication unit 331 in the cable monitoring device 500B transmits delay time information D3 indicating the calculated transmission delay time to the management device 400 via the cable monitoring devices 500A and 500D.
  • each cable monitoring device 500 transmits time information via the electromagnetic coupling unit 300 in this way, there is no need to separately provide a signal line for transmitting time information, so the configuration is simple. Synchronous processing can be performed.
  • FIG. 11 is a diagram illustrating an example of a configuration of an abnormality detection unit in the cable monitoring device according to the embodiment of the present disclosure.
  • abnormality detection unit 200 includes HPF (High Pass Filter) 210, LNA (Low Noise Amplifier) 220, ADC (Analog Digital Converter) 230, detection unit 240, detection unit 250, A storage unit 270 and a determination unit 280 are included.
  • Detection section 240 and detection section 250 are configured by, for example, an FPGA (Field-Programmable Gate Array).
  • Determining unit 280 is implemented by a processor such as a CPU (Central Processing Unit) and a DSP (Digital Signal Processor), for example.
  • the storage unit 270 is, for example, a non-volatile memory and included in the FPGA.
  • the HPF 210 attenuates the frequency components below a predetermined frequency among the frequency components of the output signals received from the signal output units 120 and 120A.
  • the output signals received from the signal output units 120 and 120A contain much noise of 50 Hz or 60 Hz corresponding to the frequency of power transmitted through the underground cable 10.
  • FIG. HPF 210 removes noise contained in the output signals received from signal output sections 120 and 120A, for example, by attenuating frequency components below 60 Hz.
  • the LNA 220 amplifies the output signal that has passed through the HPF 210 and outputs the amplified output signal to the ADC 230.
  • the ADC 230 converts the output signal received from the LNA 220 into a digital signal and outputs the digital signal to the detectors 240 and 250 . More specifically, ADC 230 generates a digital signal by sampling the output signal received from LNA 220 at a sampling frequency of 100 MHz, for example, and outputs the generated digital signal to detection section 240 and detection section 250 .
  • the abnormality detection unit 200 distinguishes between dielectric breakdown and partial discharge based on the result of comparison between the level of the output signal and a predetermined threshold value.
  • the storage unit 270 stores a threshold value ThA and a threshold value ThB as predetermined threshold values regarding the value of the digital signal generated by the ADC 230 .
  • the threshold ThB is assumed to be greater than the threshold ThA.
  • the detection unit 240 performs comparison processing for comparing the digital signal received from the ADC 230 and the thresholds ThA and ThB in the storage unit 270 . More specifically, the detector 240 performs comparison processing for each sample of the digital signal from the ADC 230 . That is, detection section 240 performs the comparison process at the comparison timing according to the 10-nanosecond period corresponding to the sampling frequency in ADC 230 .
  • detection section 240 acquires time information from counter 333 and compares the acquired time information and the digital signal.
  • the detection information da including the value of is stored in the storage unit 270 . Further, if the value of the digital signal received from ADC 230 is greater than threshold ThA and less than threshold ThB as a result of performing comparison processing at the comparison timing, detection section 240 detects that from the comparison timing.
  • the comparison process is suspended until a predetermined time period, for example, 5 microseconds, elapses, and the comparison process is restarted at the comparison timing after the elapse of the predetermined time period.
  • detection section 240 does not generate or store detection information da.
  • the detection unit 250 performs comparison processing for comparing the digital signal received from the ADC 230 and the threshold value ThB in the storage unit 270 . More specifically, the detector 250 performs comparison processing for each sample of the digital signal from the ADC 230 . That is, the detection section 250 performs comparison processing at the comparison timing.
  • the detection section 250 acquires the time information of counter 333 and generates detection information db including the acquired time information and the value of the digital signal.
  • detection section 250 does not generate detection information db.
  • the detection unit 250 After generating the detection information db, the detection unit 250 continues the comparison process at the comparison timing, and counts the number of digital signals exceeding the threshold ThB until the value of the digital signal received from the ADC 230 becomes equal to or less than the threshold ThB. to count.
  • the detection section 250 includes the count number indicating the number of counted digital signals in the generated detection information db. Then, the detection information db is stored in the storage unit 270 .
  • the determination unit 280 performs determination processing based on the detection information da and db stored in the storage unit 270 by the detection units 240 and 250 .
  • the determination unit 280 determines that partial discharge has occurred in the underground cable 10A. Then, the determination unit 280 acquires the detection information da and the ID of its own cable monitoring device 500 from the storage unit 270, generates detection information DA including the acquired detection information da and the ID, and stores the generated detection information DA. Output to the communication unit 331 .
  • the communication unit 331 receives the detection information DA from the determination unit 280 and transmits the received detection information DA to the management device 400 via the electromagnetic coupling unit 300 .
  • the determination unit 280 determines whether or not dielectric breakdown has occurred in the underground cable 10A based on the count number included in the detection information db. judge. More specifically, when the number of counts included in the detection information db is a predetermined number, for example, 5,000,000 or more, the determination unit 280 determines that the comparison processing by the detection unit 250 is 50 milliseconds (5,000,000 times ⁇ 10 nanosecond cycle) or more. If the value of the digital signal is continuously greater than the threshold value ThB during the period, it is determined that insulation breakdown has occurred in the underground cable 10A.
  • the determination unit 280 acquires the plurality of detection information db and the ID of its own cable monitoring device 500 from the storage unit 270, generates the detection information DB including the acquired detection information db and the ID, and generates the detection information DB. It outputs the information DB to the communication unit 331 .
  • the communication unit 331 receives the detection information DB from the determination unit 280 and transmits the received detection information DB to the management device 400 via the electromagnetic coupling unit 300 .
  • the determination section 280 does not generate the detection information DB.
  • the communication unit 331 in each cable monitoring device 500 transmits the detection information DA, DB to the management device 400 via the electromagnetic coupling unit 300. Since there is no need to separately provide a signal line, the detection information DA, DB can be transmitted to the management device 400 with a simple configuration.
  • the level of the output signal output from the signal detection unit 100 when insulation breakdown occurs in the underground cable 10A is the level of the output signal output from the signal detection unit 100 when partial discharge occurs in the underground cable 10A. Greater than the signal level.
  • abnormality detection section 200 detects dielectric breakdown and partial discharge based on the result of comparison between the level of the output signal, that is, the value of the digital signal generated by ADC 230 and threshold value ThB. With the configuration for discrimination, it is possible to discriminate between dielectric breakdown and partial discharge with a simple configuration and processing.
  • determination unit 280 in abnormality detection unit 200 determines that in underground cable 10A when the count number included in detection information db stored in storage unit 270 is equal to or greater than a predetermined number. With the configuration for determining that a dielectric breakdown has occurred, the dielectric breakdown in the underground cable 10A can be detected separately from switching surges.
  • the determination unit 280 determines that insulation breakdown has occurred in the underground cable 10A. does not continue for a predetermined period of time, it is determined that a switching surge has occurred in the underground cable 10A.
  • FIG. 12 is a diagram illustrating a configuration of a management device according to an embodiment of the present disclosure.
  • management device 400 includes acquisition unit 420 , partial discharge calculation unit 430 , dielectric breakdown calculation unit 440 and storage unit 450 .
  • the partial discharge calculator 430 is an example of a first calculator.
  • the dielectric breakdown calculator 440 is an example of a second calculator.
  • Acquisition unit 420, partial discharge calculation unit 430, and dielectric breakdown calculation unit 440 are realized by a processor such as a CPU and a DSP, for example.
  • Storage unit 450 is, for example, a non-volatile memory.
  • the acquisition unit 420 obtains a plurality of pieces of detection information DA each indicating the time when the plurality of cable monitoring devices 500 detected partial discharge in the underground cable 10A, and the plurality of cable monitoring devices 500 detecting a dielectric breakdown in the underground cable 10A.
  • a plurality of detection information DBs each indicating the time are acquired.
  • the acquisition unit 420 is connected to the communication unit 331 in the cable monitoring device 500D via the communication line described above.
  • Acquisition unit 420 receives detection information DA of a plurality of cable monitoring devices 500 from cable monitoring devices 500D via communication lines.
  • the acquisition unit 420 stores the received detection information DA in the storage unit 450 .
  • the acquisition unit 420 receives detection information DBs of a plurality of cable monitoring devices 500 from the cable monitoring devices 500D via communication lines.
  • the acquisition unit 420 stores the received detection information DB in the storage unit 450 .
  • the acquisition unit 420 acquires delay time information indicating the transmission delay time between the cable monitoring devices 500 . More specifically, the acquisition unit 420 receives the delay time information D1, D2, D3 from the cable monitoring device 500D via the communication line. Upon receiving the delay time information D1, D2 and D3, the acquisition unit 420 stores the received delay time information D1, D2 and D3 in the storage unit 450 .
  • the partial discharge calculator 430 calculates the position where the partial discharge occurs in the underground cable 10A based on each piece of detection information DA received by the acquirer 420 . Further, the dielectric breakdown calculation unit 440 calculates the occurrence position of the dielectric breakdown in the underground cable 10A based on each detection information DB received by the acquisition unit 420 .
  • FIG. 13 is a diagram showing an example of positions where partial discharges occur in the power transmission system according to the embodiment of the present disclosure. Referring to FIG. 13, when partial discharge occurs in underground cable 10A, the current flowing through underground cable 10A due to the occurrence of the partial discharge propagates toward insulated connection portion 42B and insulated connection portion 42C.
  • the partial discharge calculator 430 can locate the partial discharge generation position based on the partial discharge detection times of the two cable monitoring devices 500 .
  • the dielectric breakdown calculation unit 440 can locate the occurrence position of the dielectric breakdown based on the detection time of the dielectric breakdown in the two cable monitoring devices 500 and the like.
  • storage unit 450 stores distance information indicating the distance between monitoring positions of cable monitoring devices 500 in underground cable 10A and velocity information indicating the propagation velocity of current in underground cable 10A.
  • the underground cable 10A is, for example, a CV (Cross-linked polyethylene insulated vinyl sheath) cable or an OF (Oil-Filled) cable.
  • the current propagation velocity in the CV cable is, for example, 172 m/ ⁇ s
  • the current propagation velocity in the OF cable is, for example, 158 m/ ⁇ s.
  • the partial discharge calculation unit 430 corrects the detection time indicated by the detection information DA stored in the storage unit 450 using part or all of the delay time information D1, D2, and D3 according to the transmission path of the detection information DA. do. More specifically, the partial discharge calculator 430 corrects the detection time indicated by the detection information DA including the ID of the cable monitoring device 500A using the delay time information D1, and corrects the detection time indicated by the detection information DA including the ID of the cable monitoring device 500B. is corrected using the delay time information D1 and D2, and the detection time indicated by the detection information DA including the ID of the cable monitoring device 500C is corrected using the delay time information D1, D2 and D3.
  • partial discharge calculator 430 corrects the detection time by adding the transmission delay time indicated by delay time information D1 to the detection time indicated by detection information DA including the ID of cable monitoring device 500A. Further, for example, the partial discharge calculator 430 corrects the detection time by adding each transmission delay time indicated by the delay time information D1 and D2 to the detection time indicated by the detection information DA including the ID of the cable monitoring device 500B. Further, for example, the partial discharge calculator 430 corrects the detection time by adding each transmission delay time indicated by the delay time information D1, D2, and D3 to the detection time indicated by the detection information DA including the ID of the cable monitoring device 500C. do.
  • the detection time indicated by the detection information DA means the detection time after correction.
  • the dielectric breakdown calculator 440 converts the detection time indicated by the detection information DB stored in the storage unit 450 into part or all of the delay time information D1, D2, and D3 according to the transmission path of the detection information DB. corrected using Hereinafter, the detection time indicated by the detection information DB refers to the detection time after correction.
  • the partial discharge calculation unit 430 calculates the time difference between the two earliest detection times among the detection times indicated by the plurality of pieces of detection information DA related to the same partial discharge with different IDs stored in the storage unit 450 . Based on the calculated time difference and the distance information and speed information in the storage unit 450, the partial discharge calculator 430 calculates the position where the partial discharge occurs in the underground cable 10A. As an example, the partial discharge calculator 430 calculates, as the time difference, the time difference between the detection time indicated by the detection information DA including the ID of the cable monitoring device 500A and the detection time indicated by the detection information DA including the ID of the cable monitoring device 500B. It is calculated as "0.26 ⁇ s".
  • the detection time indicated by the detection information DA including the ID of the cable monitoring device 500A is earlier than the detection time indicated by the detection information DA including the ID of the cable monitoring device 500B.
  • the distance between the monitoring position of cable monitoring device 500A and the monitoring position of cable monitoring device 500B indicated by the distance information in storage unit 450 is "300 m”.
  • the propagation velocity indicated by the velocity information in storage unit 450 is "172 m/ ⁇ s”.
  • the partial discharge calculator 430 calculates the position of occurrence of the partial discharge in the underground cable 10A by 22.22 from the intermediate point between the monitoring position of the cable monitoring device 500A and the monitoring position of the cable monitoring device 500B to the cable monitoring device 500A side.
  • the dielectric breakdown calculation unit 440 calculates the time difference between the two earliest detection times among the detection times indicated by the plurality of detection information DBs regarding the same partial discharge including different IDs stored in the storage unit 450. . Based on the calculated time difference and the distance information and speed information in the storage unit 450, the dielectric breakdown calculation unit 440 calculates the location where the dielectric breakdown occurs in the underground cable 10A.
  • the partial discharge calculation unit 430 and the dielectric breakdown calculation unit 440 perform processing for notifying the administrator of the cable monitoring system 501 of the calculated occurrence position.
  • the ground connection portion 42C and the ground connection portion 43B are separated from each other.
  • the earliest two detection times among the plurality of detection times regarding the partial discharge are , the detection time indicated by the detection information DA from the cable monitoring device 500B, and the detection time indicated by the detection information DA from the cable monitoring device 500C.
  • the partial discharge calculator 430 cannot determine at which position in the section between the insulated connection portion 42C and the ground connection portion 43B the partial discharge has occurred. The same applies to the location where dielectric breakdown occurs.
  • the cable monitoring device 500 is preferably installed throughout the cable section of the underground cable 10 .
  • the cable monitoring system 501 preferably includes a cable monitoring device 500 provided corresponding to the ground connection section 43B shown in FIG. This enables the management device 400 to calculate the positions where partial discharge and dielectric breakdown occur in all cable sections.
  • FIG. 14 is a diagram illustrating a configuration of an abnormality detection unit according to a modification of the embodiment of the present disclosure.
  • abnormality detection unit 201 further includes LNA 221 and ADC 231 as compared with abnormality detection unit 200 .
  • Cable monitoring device 500 may be configured to include abnormality detection section 201 instead of abnormality detection section 200 .
  • the ADC 230 converts the output signal received from the LNA 220 into a digital signal and outputs the digital signal to the detection section 240 . That is, ADC 230 converts the output signal that has passed through HPF 210 into a digital signal and outputs the digital signal to detection section 240 .
  • the LNA 221 amplifies the output signals received from the signal output units 120 and 120A and outputs the amplified output signals to the ADC 231.
  • the ADC 231 converts the output signal received from the LNA 221 into a digital signal and outputs it to the detection section 250 . That is, ADC 230 converts an output signal that has not passed through HPF 210 into a digital signal and outputs the digital signal to detection section 250 . More specifically, ADC 231 generates a digital signal by sampling the output signal received from LNA 221 at a sampling frequency of 100 MHz, for example, and outputs the generated digital signal to detection section 250 .
  • the abnormality detection unit 201 detects partial discharge based on the output signal that has passed through the HPF 210 and detects dielectric breakdown based on the output signal that has not yet passed through the HPF 210 .
  • the detection unit 240 performs comparison processing for comparing the digital signal received from the ADC 230 and the threshold value ThA in the storage unit 270, and stores detection information da in the storage unit 270 according to the comparison result.
  • the detection unit 250 performs comparison processing for comparing the digital signal received from the ADC 231 and the threshold value ThB in the storage unit 270, and stores detection information db in the storage unit 270 according to the comparison result.
  • the determination unit 280 determines that partial discharge has occurred in the underground cable 10A. Then, the determination unit 280 acquires the detection information da and the ID of its own cable monitoring device 500 from the storage unit 270, generates detection information DA including the acquired detection information da and the ID, and stores the generated detection information DA. Output to the communication unit 331 .
  • the determination unit 280 determines that a dielectric breakdown has occurred in the underground cable 10A when a plurality of pieces of detection information db corresponding to a plurality of consecutive comparison timings CTB are stored in the storage unit 270 by the detection unit 240. Then, the determination unit 280 acquires the plurality of detection information db and the ID of its own cable monitoring device 500 from the storage unit 270, generates the detection information DB including the acquired detection information db and the ID, and generates the detection information DB. It outputs the information DB to the communication unit 331 .
  • the output signal output from the signal detection unit 100 when dielectric breakdown occurs in the underground cable 10A is a signal containing low frequency components.
  • the configuration for detecting dielectric breakdown based on the output signal before passing through the HPF 210 can detect dielectric breakdown more accurately.
  • FIG. 15 is a diagram showing the configuration of an abnormality detection unit according to a modification of the embodiment of the present disclosure.
  • abnormality detection unit 202 includes storage processing unit 290 instead of detection units 240 and 250 , and determination unit 281 instead of determination unit 280 , as compared with abnormality detection unit 200 .
  • the cable monitoring device 500 may be configured to include an abnormality detection section 202 instead of the abnormality detection section 200 .
  • the abnormality detection unit 202 distinguishes between dielectric breakdown and partial discharge based on the waveform of the output signal.
  • FIG. 16 and 17 are diagrams showing examples of output signals received by the ADC in the cable monitoring device according to the embodiment of the present disclosure.
  • FIG. 16 shows an output signal output from LNA 220 in cable monitoring device 500 when partial discharge occurs in underground cable 10A.
  • FIG. 17 shows an output signal output from LNA 220 in cable monitoring device 500 when dielectric breakdown occurs in underground cable 10A.
  • the waveform of the output signal output from LNA 220 when partial discharge occurs in underground cable 10A is, for example, an oscillating waveform that oscillates in a period of less than 1 microsecond.
  • the output signal output from LNA 220 when insulation breakdown occurs in underground cable 10A takes a saturated value over a period of 1 microsecond or longer, for example. This is because the LNA 220 is supplied with an output signal that has been shaped to have a value equal to or less than a predetermined value by a protection circuit (not shown) arranged in the preceding stage of the LNA 220 .
  • Storage unit 270 stores digital signal SA composed of K samples for a predetermined time generated by ADC 230 when partial discharge occurs in underground cable 10A, and ADC 230 when dielectric breakdown occurs in underground cable 10A. and a digital signal SB consisting of K samples for a predetermined time period generated by .
  • K is an integer of 2 or more.
  • the digital signal SA corresponds to the waveform of the output signal output from the LNA 220 when partial discharge occurs in the underground cable 10A
  • the digital signal SB is output from the LNA 220 when dielectric breakdown occurs in the underground cable 10A. corresponds to the waveform of the output signal to be
  • the storage processing unit 290 receives the digital signal from the ADC 230 and acquires the time information of the counter 333 .
  • the storage processing unit 290 adds a time stamp indicating time information to the digital signal received from the ADC 230 and stores the time-stamped digital signal in the storage unit 270 .
  • Storage unit 270 is configured by, for example, a ring buffer, and is overwritten from the oldest digital signal.
  • Determining unit 281 detects dielectric breakdown and partial discharge based on the correlation between the value of the digital signal consisting of K samples stored in storage unit 270 by storage processing unit 290 and the digital signals SA and SB in storage unit 270. to detect
  • the determination unit 281 determines the value of the digital signal composed of K consecutive samples in time series, which is stored in the storage unit 270 by the storage processing unit 290, at the calculation timing T1 according to a predetermined calculation cycle. , a correlation value CA with the value of the digital signal SA is calculated. Specifically, every time one sample of the digital signal is stored in the storage unit 270 by the storage processing unit 290, the determination unit 281 stores the value of the digital signal composed of the K samples that are closest to the sample, A correlation value CA with the value of the digital signal SA is calculated.
  • the calculation timing T1 is the timing according to the cycle in which the storage processing unit 290 stores the digital signal in the storage unit 270 .
  • the determination unit 281 determines that partial discharge has occurred in the underground cable 10A when the calculated correlation value CA is equal to or greater than a predetermined threshold value. For example, the determination unit 281 generates correlation data indicating temporal changes in the correlation value CA at each calculation timing T1. Then, when determining that a partial discharge has occurred in the underground cable 10A, the determination unit 281 determines the time given to the digital signal composed of K samples used to calculate the correlation value CA of the peak point in the correlation data. Of the stamps, detection information DA including, for example, the earliest time is generated, and the generated detection information DA is output to communication section 331 .
  • the determination unit 281 determines the value of the digital signal, which is stored in the storage unit 270 by the storage processing unit 290 at the calculation timing T2 according to a predetermined calculation cycle, and is composed of K consecutive samples in chronological order, and the value of the digital signal A correlation value CB with the value of SB is calculated. Specifically, every time one sample of the digital signal is stored in the storage unit 270 by the storage processing unit 290, the determination unit 281 stores the value of the digital signal composed of the K samples that are closest to the sample, A correlation value CB with the value of the digital signal SB is calculated.
  • the calculation timing T2 is the timing according to the cycle in which the storage processing unit 290 stores the digital signal in the storage unit 270 .
  • the determination unit 281 determines that insulation breakdown has occurred in the underground cable 10A. For example, the determination unit 281 generates correlation data indicating temporal changes in the correlation value CB at each calculation timing T2. Then, when determining that a dielectric breakdown has occurred in the underground cable 10A, the determination unit 281 determines the time given to the digital signal composed of K samples used to calculate the correlation value CB of the peak point in the correlation data. A detection information DB including, for example, the earliest time among the stamps is generated, and the generated detection information DB is output to the communication unit 331 .
  • abnormality detection unit 202 may be configured to distinguish between dielectric breakdown and partial discharge, further based on the result of comparison between the level of the output signal and the thresholds ThA and ThB. More specifically, abnormality detection section 202 further includes detection section 240 and detection section 250 . Then, similarly to the determination section 280 in the abnormality detection section 200, the determination section 281 performs determination processing further based on the detection information da and db stored in the storage section 270 by the detection sections 240 and 250.
  • the cable monitoring device 500 may be configured to include a comprehensive detection section including at least any two of the abnormality detection section 200, the abnormality detection section 201, and the abnormality detection section 202.
  • the comprehensive detection section is an example of an anomaly detection section.
  • the comprehensive detection unit comprehensively collects at least two of the results of the determination processing by the abnormality detection unit 200, the results of the determination processing by the abnormality detection unit 201, and the results of the determination processing by the abnormality detection unit 202. , the partial discharge and dielectric breakdown in the underground cable 10A are detected.
  • the abnormality detection unit 200 detects partial discharge and insulation breakdown in the underground cable 10A during a certain period TA, and during a period TB different from the period TA, Abnormality detector 201 detects partial discharge and dielectric breakdown in underground cable 10A, and abnormality detector 202 detects partial discharge and dielectric breakdown in underground cable 10A in period TC different from periods TA and TB. That is, the abnormality detection section 200 in the general detection section determines dielectric breakdown and partial discharge based on the result of comparison between the level of the output signal and a predetermined threshold during the period TA.
  • the abnormality detection section 201 in the comprehensive detection section distinguishes between dielectric breakdown and partial discharge based on the waveform of the output signal during the period TB. Further, the abnormality detection unit 202 in the comprehensive detection unit detects partial discharge based on the output signal that has passed through the HPF 210 and detects dielectric breakdown based on the output signal that has not yet passed through the HPF 210 in the period TC.
  • Each device in the cable monitoring system includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer uses a program including part or all of each step of the following flowcharts and sequences. is read from the memory and executed. Programs for these multiple devices can each be installed from the outside. Programs for these devices are stored in recording media and distributed.
  • FIG. 18 is a flow chart defining an example of an operation procedure when the cable monitoring device according to the embodiment of the present disclosure detects partial discharge and dielectric breakdown.
  • cable monitoring device 500 first, cable monitoring device 500 generates an output signal according to a change in current flowing through shield layer 75 of underground cable 10A or a change in potential of shield layer 75 (step S102).
  • step S102 when the cable monitoring device 500 generates the detection information da, that is, when the digital signal obtained by digitally converting the output signal is greater than the threshold ThA and less than the threshold ThB (step YES in S104), it is determined that partial discharge has occurred in the underground cable 10A, and the detection information DA is transmitted to the management device 400 (step S106).
  • step S102 cable monitoring device 500 generates a new output signal (step S102).
  • step S110 when cable monitoring device 500 generates detection information db, that is, when the digital signal obtained by digitally converting the output signal is greater than threshold ThB (NO in step S104 and YES in step S108), It is determined whether or not the count number included in the detection information db is equal to or greater than a predetermined number, for example, 5000000 (step S110).
  • the cable monitoring device 500 When the count number included in the detection information db is less than 5000000 (NO in step S110), the cable monitoring device 500 generates a new output signal (step S102).
  • the cable monitoring device 500 determines that a dielectric breakdown has occurred in the underground cable 10A, and sends the detection information DB to the management device 400. (step S112). Next, cable monitoring device 500 generates a new output signal (step S102).
  • step S102 if the cable monitoring device 500 does not generate the detection information da, db, that is, if the digital signal obtained by digitally converting the output signal is equal to or smaller than the threshold value ThA (NO in step S104 and step S108 NO), a new output signal is generated (step S102).
  • FIG. 19 is a diagram showing an example of the sequence of determination processing in the cable monitoring system according to the embodiment of the present disclosure.
  • cable monitoring device 500 periodically performs synchronization processing. Specifically, the cable monitoring device 500D transmits the time information to the cable monitoring device 500A at the synchronization processing timing according to the predetermined cycle (step S202).
  • the cable monitoring device 500A updates the time information of the counter 333 to the time information received from the cable monitoring device 500D (step S204).
  • the cable monitoring device 500A transmits the updated time information of the counter 333 to the cable monitoring device 500B (step S206).
  • the cable monitoring device 500A also transmits the time information to the cable monitoring device 500D (step S208).
  • cable monitoring device 500D transfers 1/2 of the difference between the time information received from cable monitoring device 500A and the current time information of its own counter 333 between cable monitoring device 500D and cable monitoring device 500A. , and transmits delay time information D1 indicating the calculated transmission delay time to the management device 400 (step S210).
  • the cable monitoring device 500B updates the time information of the counter 333 to the time information received from the cable monitoring device 500A (step S212).
  • the cable monitoring device 500B transmits the updated time information of the counter 333 to the cable monitoring device 500C (step S214). Also, the cable monitoring device 500B transmits the time information to the cable monitoring device 500A (step S216).
  • cable monitoring device 500A transfers 1/2 of the difference between the time information received from cable monitoring device 500B and the current time information of its own counter 333 between cable monitoring device 500A and cable monitoring device 500B. , and transmits delay time information D2 indicating the calculated transmission delay time to the management device 400 via the cable monitoring device 500D (step S218).
  • the cable monitoring device 500C updates the time information of the counter 333 with the time information received from the cable monitoring device 500B (step S220).
  • the cable monitoring device 500C transmits the updated time information of the counter 333 to the cable monitoring device 500B (step S222).
  • cable monitoring device 500B transfers 1/2 of the difference between the time information received from cable monitoring device 500C and the current time information of its own counter 333 between cable monitoring device 500B and cable monitoring device 500C. , and transmits delay time information D3 indicating the calculated transmission delay time to the management device 400 via the cable monitoring devices 500A and 500D (step S224).
  • the cable monitoring devices 500B and 500C detect partial discharge in the underground cable 10A, they transmit detection information DA to the management device 400 (steps S226 and S228).
  • the management device 400 corrects the detection time indicated by the detection information DA received from the cable monitoring device 500B using the delay time information D1 and D2, and corrects the detection time indicated by the detection information DA received from the cable monitoring device 500C. Correction is performed using the delay time information D1, D2, and D3. Then, the management device 400 detects the corrected detection time indicated by each detection information DA, the distance information indicating the distance between the monitoring position of the cable monitoring device 500B and the monitoring position of the cable monitoring device 500C, and the Based on the speed information indicating the propagation speed of the current, the position where the partial discharge occurs in the underground cable 10A is calculated (step S230).
  • the cable monitoring devices 500B and 500C detect dielectric breakdown in the underground cable 10A, they transmit the detection information DB to the management device 400 (steps S232 and S234).
  • the management device 400 corrects the detection time indicated by the detection information DB received from the cable monitoring device 500B using the delay time information D1 and D2, and corrects the detection time indicated by the detection information DB received from the cable monitoring device 500C. Correction is performed using the delay time information D1, D2, and D3. Then, the management device 400 stores the corrected detection time indicated by each detection information DB, distance information indicating the distance between the monitoring position of the cable monitoring device 500B and the monitoring position of the cable monitoring device 500C, and Based on the speed information indicating the propagation speed of the current, the position where the dielectric breakdown occurred in the underground cable 10A is calculated (step S236).
  • the cable monitoring devices 500B and 500C detect partial discharge and transmit the detection information DA to the management device 400, and then detect dielectric breakdown and transmit the detection information DB to the management device 400.
  • the cable monitoring device 500 is not limited to the configuration in which the detection information DA and the detection information DB are transmitted to the management device 400 in this order. After detecting a dielectric breakdown at a certain position in the underground cable 10A and transmitting the detection information DB to the management device 400, the cable monitoring device 500 detects a dielectric breakdown at another position in the underground cable 10A. The DB is transmitted to the management device 400 again.
  • the cable monitoring device 500 detects a partial discharge at another position in the underground cable 10A after detecting a dielectric breakdown at a certain position in the underground cable 10A and transmitting the detection information DB to the management device 400, It transmits the detection information DA to the management device 400 .
  • the cable monitoring system 501 is configured to include four cable monitoring devices 500, it is not limited to this. Cable monitoring system 501 may be configured with two, three, or more than five cable monitoring devices 500 . Moreover, the cable monitoring system 501 may be configured without the cable monitoring device 500D provided corresponding to the ground connection section 43A. In addition, the cable monitoring system 501 includes a cable monitoring device 500 provided corresponding to the ground connection section 43B shown in FIG. 1 instead of or in addition to the cable monitoring device 500D. good too.
  • the management device 400 is connected to the cable monitoring device 500D, but the configuration is not limited to this.
  • the management device 400 may be connected to a cable monitoring device 500 other than the cable monitoring device 500D, or may be provided integrally with any cable monitoring device 500. FIG.
  • the acquisition unit 420 receives the detection information DA from each of the plurality of cable monitoring devices 500 via the electromagnetic coupling unit 410, and each of the plurality of cable monitoring devices 500
  • the detection information DB is received via the electromagnetic coupling unit 410 from the above, the present invention is not limited to this.
  • the acquisition unit 420 may be configured to acquire the detection information DA and DB generated in each cable monitoring device 500 off-line.
  • the abnormality detection section 200 is configured to include the detection section 240 and the detection section 250, but the configuration is not limited to this.
  • Abnormality detection section 200 may be configured to include a storage processing section instead of detection section 240 and detection section 250 .
  • the storage processing unit performs processing for storing the digital signal received from the ADC 230 in the storage unit 270 .
  • the determination unit 280 performs the above-described comparison processing and determination processing on the digital signal stored in the storage unit 270 by the storage processing unit.
  • the abnormality detection unit 201 is configured to include the detection unit 240 and the detection unit 250, but it is not limited to this.
  • the abnormality detection section 201 may be configured to include a storage processing section instead of the detection section 240 .
  • the storage processing unit performs processing for storing the digital signal received from the ADC 230 in the storage unit 270 .
  • the abnormality detection section 201 may be configured to include a storage processing section instead of the detection section 250 .
  • the storage processing unit performs processing for storing the digital signal received from the ADC 231 in the storage unit 270 .
  • the determination unit 280 performs the above-described comparison processing and determination processing on the digital signal stored in the storage unit 270 by the storage processing unit.
  • the communication unit 331 is configured to transmit the detection information DA and DB to the management device 400, but the configuration is not limited to this.
  • the communication unit 331 may be configured not to transmit at least one of the detection information DA and DB to the management device 400 .
  • the cable monitoring device 500 may be configured without the communication unit 331 .
  • the management device 400 acquires the detection information DA, DB generated in each cable monitoring device 500 off-line as described above. More specifically, the determination unit 280 stores the generated detection information DA and DB in the storage unit 270 .
  • the administrator of the cable monitoring system 501 periodically or irregularly connects a recording medium such as a USB memory to the cable monitoring device 500 and copies the detection information DA, DB in the storage unit 270 to the recording medium. Then, the administrator connects the recording medium on which the detection information DA and DB are copied to the management device 400 and saves the detection information DA and DB in the storage unit 450 of the management device 400 .
  • the partial discharge calculation unit 430 and the dielectric breakdown calculation unit 440 in the management device 400 calculate the occurrence positions of partial discharge and dielectric breakdown based on the detection information DA and DB stored in the storage unit 450 by the administrator.
  • the cable monitoring device 500 receives, for example, a GPS (Global Positioning System) signal, obtains the current time based on the received GPS signal, and updates the time information of the counter 333 .
  • GPS Global Positioning System
  • the cable monitoring device 500 is configured to include the synchronization unit 332, it is not limited to this.
  • the cable monitoring device 500 may be configured without the synchronization unit 332 .
  • the abnormality detection unit determines that the dielectric breakdown has occurred in the cable when a state in which the level of the output signal is equal to or higher than a predetermined value continues for a predetermined period of time, and the state in which the level of the output signal is equal to or higher than the predetermined value is determined.
  • a cable monitoring device that determines that an opening/closing surge has occurred in the cable if it does not continue for the predetermined period of time.
  • a plurality of cable monitors installed at different positions for monitoring a cable having a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is the conductor that surrounds the insulating layer Obtaining a plurality of first detection information each indicating a time at which a device detects partial discharge in the cable and a plurality of second detection information each indicating a time at which the plurality of cable monitoring devices detect a dielectric breakdown in the cable.
  • an acquisition unit a first calculation unit that calculates the occurrence position of the partial discharge in the cable based on each of the first detection information acquired by the acquisition unit; a second calculation unit that calculates a position where the dielectric breakdown occurs in the cable based on each of the second detection information acquired by the acquisition unit;
  • the acquisition unit further acquires a transmission delay time between the plurality of cable monitoring devices,
  • the first calculator corrects the time indicated by each of the first detection information using the transmission delay time, and calculates the occurrence position of the partial discharge based on the corrected time of each of the first detection information.
  • the second calculator corrects the time indicated by each of the second detection information using the transmission delay time, and calculates the occurrence position of the dielectric breakdown based on the corrected time of each of the second detection information.
  • a management device that calculates.

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Abstract

The present invention is a cable monitoring device that monitors an underground cable having a line-shaped conductor that transmits power, an insulation layer that covers the periphery of the conductor, and a shielding layer that is a conductor that covers the periphery of the insulation layer, the cable monitoring device comprising: a signal detection unit that outputs an output signal corresponding to changes in the current flowing through the shielding layer, or to changes in the potential of the shielding layer; and an irregularity detection unit that detects partial discharge and insulation breakage in the underground cable on the basis of the output signal outputted from the signal detection unit.

Description

ケーブル監視装置、管理装置、ケーブル監視システムおよびケーブル監視方法CABLE MONITORING DEVICE, MANAGEMENT DEVICE, CABLE MONITORING SYSTEM AND CABLE MONITORING METHOD
　本開示は、ケーブル監視装置、管理装置、ケーブル監視システムおよびケーブル監視方法に関する。
　この出願は、２０２１年２月１５日に出願された日本出願特願２０２１－２１５３０号を基礎とする優先権を主張し、その開示のすべてをここに取り込む。 The present disclosure relates to a cable monitoring device, a management device, a cable monitoring system and a cable monitoring method.
This application claims priority based on Japanese Patent Application No. 2021-21530 filed on February 15, 2021, and incorporates all of its disclosure herein.
　特許文献１（特開２０１３－２１７８７０号公報）には、以下のような事故点標定装置が開示されている。すなわち、事故点標定装置は、区間を構成する地中ケーブルの各端末部よりも内側に周回するように配設され、前記地中ケーブルの端末部に一端が接続されると共に他端が接地された接地線が通され、事故点で発生する電流を検出して出力する複数の光電流センサと、光ファイバ伝送路を介して入力された前記各光電流センサの出力信号から、ローパスフィルタによって商用周波数帯域の事故電流を抽出して出力する商用周波数成分検出部を有し、前記商用周波数成分検出部が前記各区間の両端末部内側に配設された光電流センサの出力信号から抽出した複数周期の事故電流に基づいて事故区間を検出する事故区間検出部と、前記光ファイバ伝送路を介して入力された前記各光電流センサの出力信号から、ハイパスフィルタによって前記商用周波数帯域よりも高周波のサージ電流を抽出して出力するサージ電流成分検出部を有し、前記サージ電流成分検出部が前記各区間の両端末部内側に配設された光電流センサの出力信号から抽出したサージ電流に基づいて、サージ電流が当該各光電流センサに到達した時間差を算出することにより、事故点情報である事故点距離を標定する事故点標定部を有する事故点検出部とを備える。 Patent Document 1 (Japanese Patent Application Laid-Open No. 2013-217870) discloses the following accident point locating device. That is, the accident point locating device is disposed so as to loop inside each end portion of the underground cable that constitutes the section, and one end is connected to the end portion of the underground cable and the other end is grounded. A plurality of photocurrent sensors that detect and output the current generated at the accident point through a grounding wire, and the output signal of each of the photocurrent sensors that is input via the optical fiber transmission line is used by a low-pass filter to obtain a commercial signal. a commercial frequency component detector for extracting and outputting fault current in a frequency band, wherein the commercial frequency component detector is extracted from the output signal of a photocurrent sensor disposed inside both terminal portions of each section; A fault zone detector for detecting fault zones based on periodic fault currents; It has a surge current component detector that extracts and outputs a surge current, and the surge current component detector is based on the surge current extracted from the output signal of a photocurrent sensor disposed inside both terminal portions of each section. and an accident point detection unit having an accident point locating unit for locating an accident point distance, which is accident point information, by calculating the time difference between when the surge current reaches each photocurrent sensor.
　また、特許文献２（国際公開公報第２０１６／０７９８６９号）には、以下のような部分放電位置標定装置が開示されている。すなわち、部分放電位置標定装置は、電力ケーブルが接続されたガス絶縁機器内または前記電力ケーブル内で発生した部分放電の位置標定が可能な部分放電位置標定装置であって、前記ガス絶縁機器に取り付けられ、部分放電信号を検出可能な第１のセンサと、前記電力ケーブルに取り付けられ、前記部分放電信号を検出可能な第２のセンサと、前記第１のセンサによる前記部分放電信号の検出時刻と前記第２のセンサによる前記部分放電信号の検出時刻との差である時間差を検出する時間差検出部と、前記時間差検出部により検出された前記時間差と、前記ガス絶縁機器内での前記部分放電信号の伝搬速度と、前記電力ケーブル内での前記部分放電信号の伝搬速度とに基づいて前記部分放電の発生位置を標定する処理部とを備える。 In addition, Patent Document 2 (International Publication No. 2016/079869) discloses the following partial discharge positioning device. That is, the partial discharge position locating device is a partial discharge locating device capable of locating the position of the partial discharge generated in the gas insulated equipment to which the power cable is connected or in the power cable, and is attached to the gas insulated equipment. a first sensor capable of detecting a partial discharge signal; a second sensor attached to the power cable and capable of detecting the partial discharge signal; and a detection time of the partial discharge signal by the first sensor. a time difference detection unit for detecting a time difference between a time at which the partial discharge signal is detected by the second sensor; and the time difference detected by the time difference detection unit and the partial discharge signal in the gas-insulated equipment. and a processing unit for locating the generation position of the partial discharge based on the propagation speed of the partial discharge signal and the propagation speed of the partial discharge signal in the power cable.
特開２０１３－２１７８７０号公報JP 2013-217870 A 国際公開公報第２０１６／０７９８６９号International Publication No. 2016/079869
　本開示のケーブル監視装置は、電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視するケーブル監視装置であって、前記遮蔽層を通して流れる電流の変化、または前記遮蔽層の電位の変化に応じた出力信号を出力する信号検出部と、前記信号検出部から出力される前記出力信号に基づいて、前記ケーブルにおける部分放電および絶縁破壊を検出する異常検出部とを備える。 A cable monitoring device according to the present disclosure monitors a cable having a linear conductor that transmits electric power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer. A signal detection unit that outputs an output signal corresponding to a change in the current flowing through the shielding layer or a change in the potential of the shielding layer; and based on the output signal output from the signal detection unit, the an anomaly detector for detecting partial discharge and dielectric breakdown in the cable;
　本開示の管理装置は、電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視する互いに異なる位置に設置された複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報、および前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報を取得する取得部と、前記取得部により取得された前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出する第１算出部と、前記取得部により取得された前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出する第２算出部とを備える。 The management device of the present disclosure monitors a cable having a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer. A plurality of pieces of first detection information respectively indicating times at which a plurality of installed cable monitoring devices detected partial discharge in the cable, and a plurality of pieces of information indicating times at which the plurality of cable monitoring devices detected a dielectric breakdown in the cable. an acquisition unit that acquires second detection information; a first calculation unit that calculates the occurrence position of the partial discharge in the cable based on each of the first detection information acquired by the acquisition unit; and a second calculator that calculates a location where the dielectric breakdown occurs in the cable based on the obtained second detection information.
　本開示のケーブル監視システムは、電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視する互いに異なる位置に設置された複数のケーブル監視装置と、前記複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報と、前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報とを取得する管理装置とを備え、前記管理装置は、取得した前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出し、取得した前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出する。 A cable monitoring system of the present disclosure monitors a cable having a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer. a plurality of cable monitoring devices installed in the cable; a plurality of first detection information indicating times at which the plurality of cable monitoring devices detect partial discharge in the cable; and a management device that acquires a plurality of pieces of second detection information each indicating a time at which the partial discharge is detected, and the management device determines the generation position of the partial discharge in the cable based on each of the acquired first detection information. Based on each of the calculated and acquired second detection information, a position where the dielectric breakdown occurs in the cable is calculated.
　本開示のケーブル監視方法は、互いに異なる位置に設置された複数のケーブル監視装置と、管理装置とを備えるケーブル監視システムにおけるケーブル監視方法であって、前記複数のケーブル監視装置が、電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視するステップと、前記管理装置が、前記複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報を取得するステップと、前記管理装置が、前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報とを取得するステップと、前記管理装置が、取得した前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出するステップと、前記管理装置が、取得した前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出するステップとを含む。 A cable monitoring method of the present disclosure is a cable monitoring method in a cable monitoring system including a plurality of cable monitoring devices installed at mutually different positions and a management device, wherein the plurality of cable monitoring devices transmit power. a step of monitoring a cable having a linear conductor, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer; obtaining a plurality of pieces of first detection information each indicating a time at which partial discharge is detected in the cable; a step of obtaining second detection information; a step of calculating, by the management device, the position where the partial discharge occurs in the cable based on each of the obtained first detection information; and calculating a position where the dielectric breakdown occurs in the cable based on each of the second detection information.
　本開示の一態様は、このような特徴的な処理部を備えるケーブル監視装置として実現され得るだけでなく、ケーブル監視装置の一部または全部を実現する半導体集積回路として実現され得たり、ケーブル監視装置における処理をステップとする方法として実現され得たり、ケーブル監視装置における処理のステップをコンピュータに実行させるためのプログラムとして実現され得る。また、本開示の一態様は、このような特徴的な処理部を備える管理装置として実現され得るだけでなく、管理装置の一部または全部を実現する半導体集積回路として実現され得たり、管理装置における処理をステップとする方法として実現され得たり、管理装置における処理のステップをコンピュータに実行させるためのプログラムとして実現され得る。また、本開示の一態様は、このような特徴的な処理部を備えるケーブル監視システムとして実現され得るだけでなく、ケーブル監視システムの一部または全部を実現する半導体集積回路として実現され得たり、ケーブル監視システムにおける処理のステップをコンピュータに実行させるためのプログラムとして実現され得る。 One aspect of the present disclosure can be implemented not only as a cable monitoring device including such a characteristic processing unit, but also as a semiconductor integrated circuit that implements part or all of the cable monitoring device, or as a cable monitoring device. It can be realized as a method having steps of processing in the device, or as a program for causing a computer to execute the steps of processing in the cable monitoring device. In addition, one aspect of the present disclosure can be implemented not only as a management device including such a characteristic processing unit, but also as a semiconductor integrated circuit that implements part or all of the management device, or as a management device. or as a program for causing a computer to execute the steps of the processing in the management apparatus. Further, one aspect of the present disclosure can be implemented not only as a cable monitoring system including such a characteristic processing unit, but also as a semiconductor integrated circuit that implements part or all of the cable monitoring system, It can be implemented as a program for causing a computer to execute processing steps in the cable monitoring system.
図１は、本開示の実施の形態に係る送電システムの構成を示す図である。FIG. 1 is a diagram showing the configuration of a power transmission system according to an embodiment of the present disclosure. 図２は、本開示の実施の形態に係る送電システムに用いられる地中ケーブルの構成の一例を示す図である。FIG. 2 is a diagram illustrating an example of a configuration of an underground cable used in a power transmission system according to an embodiment of the present disclosure; 図３は、本開示の実施の形態に係る送電システムに用いられる普通接続部における地中ケーブルの接続方法の一例を示す図である。FIG. 3 is a diagram illustrating an example of a connection method of an underground cable in a normal connection section used in the power transmission system according to the embodiment of the present disclosure. 図４は、本開示の実施の形態に係る送電システムに用いられる絶縁接続部における地中ケーブルの接続方法の一例を示す図である。FIG. 4 is a diagram illustrating an example of a connection method of an underground cable at an insulated joint used in the power transmission system according to the embodiment of the present disclosure. 図５は、本開示の実施の形態に係る送電システムに用いられる絶縁接続部における地中ケーブルの接続方法の他の例を示す図である。FIG. 5 is a diagram illustrating another example of a connection method of an underground cable at an insulated joint used in the power transmission system according to the embodiment of the present disclosure. 図６は、本開示の実施の形態に係るケーブル監視システムの構成を示す図である。FIG. 6 is a diagram showing the configuration of the cable monitoring system according to the embodiment of the present disclosure. 図７は、本開示の実施の形態に係るケーブル監視装置の構成を示す図である。FIG. 7 is a diagram showing the configuration of the cable monitoring device according to the embodiment of the present disclosure. 図８は、本開示の実施の形態に係るケーブル監視装置におけるＣＴの構成を示す図である。FIG. 8 is a diagram showing the configuration of CT in the cable monitoring device according to the embodiment of the present disclosure. 図９は、本開示の実施の形態の変形例に係るケーブル監視装置の構成を示す図である。FIG. 9 is a diagram showing a configuration of a cable monitoring device according to a modification of the embodiment of the present disclosure; 図１０は、本開示の実施の形態に係るケーブル監視装置における金属箔電極の取り付け例を示す図である。FIG. 10 is a diagram showing an example of attachment of metal foil electrodes in the cable monitoring device according to the embodiment of the present disclosure. 図１１は、本開示の実施の形態に係るケーブル監視装置における異常検出部の構成の一例を示す図である。FIG. 11 is a diagram illustrating an example of a configuration of an abnormality detection unit in the cable monitoring device according to the embodiment of the present disclosure; 図１２は、本開示の実施の形態に係る管理装置の構成を示す図である。FIG. 12 is a diagram illustrating a configuration of a management device according to an embodiment of the present disclosure; 図１３は、本開示の実施の形態に係る送電システムにおける部分放電の発生位置の一例を示す図である。FIG. 13 is a diagram illustrating an example of positions where partial discharges occur in the power transmission system according to the embodiment of the present disclosure. 図１４は、本開示の実施の形態の変形例に係る異常検出部の構成を示す図である。FIG. 14 is a diagram illustrating a configuration of an abnormality detection unit according to a modification of the embodiment of the present disclosure; 図１５は、本開示の実施の形態の変形例に係る異常検出部の構成を示す図である。FIG. 15 is a diagram illustrating a configuration of an abnormality detection unit according to a modification of the embodiment of the present disclosure; 図１６は、本開示の実施の形態に係るケーブル監視装置におけるＡＤＣが受ける出力信号の一例を示す図である。16 is a diagram illustrating an example of an output signal received by an ADC in the cable monitoring device according to the embodiment of the present disclosure; FIG. 図１７は、本開示の実施の形態に係るケーブル監視装置におけるＡＤＣが受ける出力信号の一例を示す図である。17 is a diagram illustrating an example of an output signal received by an ADC in the cable monitoring device according to the embodiment of the present disclosure; FIG. 図１８は、本開示の実施の形態に係るケーブル監視装置が部分放電および絶縁破壊の検出を行う際の動作手順の一例を定めたフローチャートである。FIG. 18 is a flow chart defining an example of an operation procedure when the cable monitoring device according to the embodiment of the present disclosure detects partial discharge and dielectric breakdown. 図１９は、本開示の実施の形態に係るケーブル監視システムにおける判定処理のシーケンスの一例を示す図である。FIG. 19 is a diagram illustrating an example of a sequence of determination processing in the cable monitoring system according to the embodiment of the present disclosure;
　従来、ケーブルを監視し、ケーブルにおける異常を検出する技術が提案されている。 Conventionally, technologies have been proposed for monitoring cables and detecting abnormalities in cables.
　［本開示が解決しようとする課題］
　特許文献１に記載の技術では、ケーブルにおける部分放電を検出することはできない。また、特許文献２に記載の技術では、ケーブルにおける絶縁破壊を検出することはできない。 [Problems to be Solved by the Present Disclosure]
The technique described in Patent Document 1 cannot detect partial discharge in a cable. In addition, the technique described in Patent Document 2 cannot detect dielectric breakdown in the cable.
　特許文献１および２に記載の技術を超えて、ケーブルにおける部分放電および絶縁破壊の検出に関する優れた機能を実現することが可能な技術が望まれる。 A technique that goes beyond the techniques described in Patent Documents 1 and 2 and is capable of realizing excellent functions related to detection of partial discharge and dielectric breakdown in cables is desired.
　本開示は、上述の課題を解決するためになされたもので、その目的は、ケーブルにおける部分放電および絶縁破壊の検出に関する優れた機能を実現することが可能なケーブル監視装置、管理装置、ケーブル監視システムおよびケーブル監視方法を提供することである。 The present disclosure has been made to solve the above problems, and its object is to provide a cable monitoring device, a management device, and a cable monitoring device capable of realizing excellent functions related to detection of partial discharge and dielectric breakdown in cables. To provide a system and cable monitoring method.
　［本開示の効果］
　本開示によれば、ケーブルにおける部分放電および絶縁破壊の検出に関する優れた機能を実現することができる。 [Effect of the present disclosure]
Advantageous Effects of Invention According to the present disclosure, superior functionality regarding detection of partial discharge and dielectric breakdown in cables can be achieved.
　［本開示の実施形態の説明］
　最初に、本開示の実施形態の内容を列記して説明する。 [Description of Embodiments of the Present Disclosure]
First, the contents of the embodiments of the present disclosure will be listed and described.
　（１）本開示の実施の形態に係るケーブル監視装置は、電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視するケーブル監視装置であって、前記遮蔽層を通して流れる電流の変化、または前記遮蔽層の電位の変化に応じた出力信号を出力する信号検出部と、前記信号検出部から出力される前記出力信号に基づいて、前記ケーブルにおける部分放電および絶縁破壊を検出する異常検出部とを備える。 (1) A cable monitoring device according to an embodiment of the present disclosure includes a linear conductor that transmits electric power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer. A cable monitoring device for monitoring a cable having and an abnormality detection unit that detects partial discharge and dielectric breakdown in the cable based on the output signal.
　このように、共通の信号検出部から出力される共通の出力信号に基づいて、ケーブルにおける部分放電および絶縁破壊の両方を検出する構成により、簡易な構成でケーブルにおける部分放電および絶縁破壊を検出することができる。したがって、ケーブルにおける部分放電および絶縁破壊の検出に関する優れた機能を実現することができる。 In this way, based on the common output signal output from the common signal detection unit, both partial discharge and dielectric breakdown in the cable are detected with a simple configuration, thereby detecting partial discharge and dielectric breakdown in the cable. be able to. Therefore, excellent functionality for detecting partial discharges and dielectric breakdowns in cables can be achieved.
　（２）前記異常検出部は、前記出力信号のレベルと所定のしきい値との比較結果に基づいて、前記部分放電と前記絶縁破壊とを判別してもよい。 (2) The abnormality detection section may distinguish between the partial discharge and the dielectric breakdown based on a comparison result between the level of the output signal and a predetermined threshold value.
　このような構成により、絶縁破壊の発生時に信号検出部から出力される出力信号と、部分放電の発生時に信号検出部から出力される出力信号とのレベルの差に着目して、絶縁破壊と部分放電とをより簡単に判別することができる。 With such a configuration, by paying attention to the level difference between the output signal output from the signal detection section when dielectric breakdown occurs and the output signal output from the signal detection section when partial discharge occurs, dielectric breakdown and partial discharge are detected. Discharge can be more easily distinguished.
　（３）前記異常検出部は、前記出力信号の波形に基づいて、前記部分放電と前記絶縁破壊とを判別してもよい。 (3) The abnormality detection section may distinguish between the partial discharge and the dielectric breakdown based on the waveform of the output signal.
　このような構成により、絶縁破壊の発生時に信号検出部から出力される出力信号と、部分放電の発生時に信号検出部から出力される出力信号との波形の相違に着目して、絶縁破壊と部分放電とをより正確に判別することができる。 With such a configuration, by paying attention to the difference in waveform between the output signal output from the signal detection unit when dielectric breakdown occurs and the output signal output from the signal detection unit when partial discharge occurs, dielectric breakdown and partial discharge are detected. Discharge can be determined more accurately.
　（４）前記異常検出部は、所定の周波数以下の成分を減衰させるハイパスフィルタを通過した前記出力信号に基づいて前記部分放電を検出し、前記ハイパスフィルタを通過する前の前記出力信号に基づいて前記絶縁破壊を検出してもよい。 (4) The abnormality detection unit detects the partial discharge based on the output signal that has passed through a high-pass filter that attenuates components below a predetermined frequency, and detects the partial discharge based on the output signal that has not passed through the high-pass filter. The dielectric breakdown may be detected.
　このような構成により、ハイパスフィルタを用いて低周波のノイズを除去して部分放電を検出することができるとともに、絶縁破壊に起因するより多くの低周波成分を抽出して絶縁破壊を検出することができる。 With such a configuration, it is possible to detect partial discharge by removing low-frequency noise using a high-pass filter, and to detect dielectric breakdown by extracting more low-frequency components caused by dielectric breakdown. can be done.
　（５）前記ケーブル監視装置は、さらに、前記異常検出部が前記部分放電を検出した時刻を他の装置へ通知する通知部を備える構成であってもよい。 (5) The cable monitoring device may further include a notification unit that notifies another device of the time at which the abnormality detection unit detected the partial discharge.
　このような構成により、他の装置において、複数のケーブル監視装置における部分放電の検出時刻を用いて、ケーブルにおける部分放電の発生位置を標定することができる。 With such a configuration, it is possible to locate the occurrence position of the partial discharge in the cable in another device using the partial discharge detection times in the plurality of cable monitoring devices.
　（６）前記ケーブル監視装置は、さらに、前記異常検出部が前記絶縁破壊を検出した時刻を他の装置へ通知する通知部を備える構成であってもよい。 (6) The cable monitoring device may further include a notification unit that notifies another device of the time at which the abnormality detection unit detects the dielectric breakdown.
　このような構成により、他の装置において、複数のケーブル監視装置における絶縁破壊の検出時刻を用いて、ケーブルにおける絶縁破壊の発生位置を標定することができる。 With such a configuration, it is possible to locate the occurrence position of dielectric breakdown in a cable in another device using the dielectric breakdown detection times in a plurality of cable monitoring devices.
　（７）前記ケーブル監視装置は、さらに、前記ケーブルを監視する他の前記ケーブル監視装置との通信により前記他のケーブル監視装置との時刻同期をとるための処理を行う同期部を備える構成であってもよい。 (7) The cable monitoring device further includes a synchronization unit that performs processing for synchronizing time with the other cable monitoring device through communication with the other cable monitoring device that monitors the cable. may
　このような構成により、簡単な構成で複数のケーブル監視装置の時刻同期をとることができるので、簡単な構成でケーブルにおける部分放電の発生位置および絶縁破壊の発生位置を標定することができる。 With such a configuration, it is possible to time-synchronize a plurality of cable monitoring devices with a simple configuration, so it is possible to locate the location of occurrence of partial discharge and the location of occurrence of dielectric breakdown in a cable with a simple configuration.
　（８）本開示の実施の形態に係る管理装置は、電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視する互いに異なる位置に設置された複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報、および前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報を取得する取得部と、前記取得部により取得された前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出する第１算出部と、前記取得部により取得された前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出する第２算出部とを備える。 (8) A management device according to an embodiment of the present disclosure includes a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer. a plurality of first detection information indicating times when a plurality of cable monitoring devices installed at mutually different positions for monitoring a cable detect partial discharge in the cable; an acquisition unit configured to acquire a plurality of pieces of second detection information each indicating a detection time; a calculator; and a second calculator that calculates a location where the dielectric breakdown occurs in the cable based on each of the second detection information acquired by the acquirer.
　このように、部分放電および絶縁破壊の両方を検出可能な複数のケーブル監視装置における部分放電の検出時刻に基づいて部分放電の発生位置を算出し、当該複数のケーブル監視装置における絶縁破壊の検出時刻に基づいて絶縁破壊の発生位置を算出する構成により、簡易なシステム構成で部分放電の発生位置および絶縁破壊の発生位置の両方を標定することができる。したがって、ケーブルにおける部分放電および絶縁破壊の検出に関する優れた機能を実現することができる。 In this way, the occurrence position of partial discharge is calculated based on the partial discharge detection time in a plurality of cable monitoring devices capable of detecting both partial discharge and insulation breakdown, and the dielectric breakdown detection time in the plurality of cable monitoring devices is calculated. With the configuration for calculating the position of occurrence of dielectric breakdown based on , it is possible to locate both the position of occurrence of partial discharge and the position of occurrence of dielectric breakdown with a simple system configuration. Therefore, excellent functionality for detecting partial discharges and dielectric breakdowns in cables can be achieved.
　（９）本開示の実施の形態に係るケーブル監視システムは、電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視する互いに異なる位置に設置された複数のケーブル監視装置と、前記複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報と、前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報とを取得する管理装置とを備え、前記管理装置は、取得した前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出し、取得した前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出する。 (9) A cable monitoring system according to an embodiment of the present disclosure includes a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer. a plurality of cable monitoring devices installed at different positions for monitoring the cables, a plurality of first detection information indicating times when the plurality of cable monitoring devices detected partial discharge in the cables, and the plurality of cables a management device that acquires a plurality of pieces of second detection information each indicating a time at which a monitoring device detects a dielectric breakdown in the cable; and the management device acquires the cable based on the acquired first detection information. , and based on each of the acquired second detection information, calculate the position of occurrence of the dielectric breakdown in the cable.
　このように、部分放電および絶縁破壊の両方を検出可能な複数のケーブル監視装置における部分放電の検出時刻に基づいて部分放電の発生位置を算出し、当該複数のケーブル監視装置における絶縁破壊の検出時刻に基づいて絶縁破壊の発生位置を算出する構成により、簡易な構成で部分放電の発生位置および絶縁破壊の発生位置の両方を標定することができる。したがって、ケーブルにおける部分放電および絶縁破壊の検出に関する優れた機能を実現することができる。 In this way, the occurrence position of partial discharge is calculated based on the partial discharge detection time in a plurality of cable monitoring devices capable of detecting both partial discharge and insulation breakdown, and the dielectric breakdown detection time in the plurality of cable monitoring devices is calculated. With the configuration for calculating the dielectric breakdown occurrence position based on , it is possible to locate both the partial discharge occurrence position and the dielectric breakdown occurrence position with a simple configuration. Therefore, excellent functionality for detecting partial discharges and dielectric breakdowns in cables can be achieved.
　（１０）本開示の実施の形態に係るケーブル監視方法は、互いに異なる位置に設置された複数のケーブル監視装置と、管理装置とを備えるケーブル監視システムにおけるケーブル監視方法であって、前記複数のケーブル監視装置が、電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視するステップと、前記管理装置が、前記複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報を取得するステップと、前記管理装置が、前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報とを取得するステップと、前記管理装置が、取得した前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出するステップと、前記管理装置が、取得した前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出するステップとを含む。 (10) A cable monitoring method according to an embodiment of the present disclosure is a cable monitoring method in a cable monitoring system including a plurality of cable monitoring devices installed at mutually different positions and a management device, wherein the plurality of cables a monitoring device monitoring a cable having a linear conductor that transmits electric power, an insulating layer surrounding the conductor, and a shielding layer that is a conductor surrounding the insulating layer; a step of acquiring a plurality of first detection information respectively indicating times when the plurality of cable monitoring devices detected partial discharge in the cable; acquiring a plurality of pieces of second detection information each indicating a detection time; and calculating, by the management device, the location where the partial discharge occurs in the cable based on the acquired pieces of the first detection information. and calculating, by the management device, the location where the dielectric breakdown occurs in the cable based on the obtained second detection information.
　このように、部分放電および絶縁破壊の両方を検出可能な複数のケーブル監視装置における部分放電の検出時刻に基づいて部分放電の発生位置を算出し、当該複数のケーブル監視装置における絶縁破壊の検出時刻に基づいて絶縁破壊の発生位置を算出する方法により、簡易な方法で部分放電の発生位置および絶縁破壊の発生位置の両方を標定することができる。したがって、ケーブルにおける部分放電および絶縁破壊の検出に関する優れた機能を実現することができる。 In this way, the occurrence position of partial discharge is calculated based on the partial discharge detection time in a plurality of cable monitoring devices capable of detecting both partial discharge and insulation breakdown, and the dielectric breakdown detection time in the plurality of cable monitoring devices is calculated. Both the partial discharge occurrence position and the dielectric breakdown occurrence position can be located by a simple method by the method of calculating the dielectric breakdown occurrence position based on the above. Therefore, excellent functionality for detecting partial discharges and dielectric breakdowns in cables can be achieved.
　以下、本開示の実施の形態について図面を用いて説明する。なお、図中同一または相当部分には同一符号を付してその説明は繰り返さない。また、以下に記載する実施の形態の少なくとも一部を任意に組み合わせてもよい。 Embodiments of the present disclosure will be described below with reference to the drawings. The same or corresponding parts in the drawings are denoted by the same reference numerals, and the description thereof will not be repeated. Moreover, at least part of the embodiments described below may be combined arbitrarily.
　［構成および基本動作］
　図１は、本開示の実施の形態に係る送電システムの構成を示す図である。図１を参照して、送電システム５０２は、地中ケーブル１０Ａ，１０Ｂ，１０Ｃと、普通接続部４１Ａ，４１Ｂと、絶縁接続部４２Ａ，４２Ｂ，４２Ｃと、地上接続部４３Ａ，４３Ｂとを備える。以下、地中ケーブル１０Ａ，１０Ｂ，１０Ｃの各々を地中ケーブル１０とも称し、普通接続部４１Ａ，４１Ｂの各々を普通接続部４１とも称し、絶縁接続部４２Ａ，４２Ｂ，４２Ｃの各々を絶縁接続部４２とも称し、地上接続部４３Ａ，４３Ｂの各々を地上接続部４３とも称する。送電システム５０２の少なくとも一部分は、たとえば電力系統における地中部分に設けられる。 [Configuration and basic operation]
FIG. 1 is a diagram showing the configuration of a power transmission system according to an embodiment of the present disclosure. Referring to FIG. 1, power transmission system 502 includes underground cables 10A, 10B, 10C, normal connections 41A, 41B, insulated connections 42A, 42B, 42C, and ground connections 43A, 43B. Hereinafter, each of the underground cables 10A, 10B, and 10C is also referred to as the underground cable 10, each of the normal connection portions 41A and 41B is also referred to as a normal connection portion 41, and each of the insulated connection portions 42A, 42B, and 42C is referred to as an insulated connection portion. 42 , and each of the ground connection portions 43 A and 43 B is also referred to as a ground connection portion 43 . At least a portion of transmission system 502 is provided, for example, in an underground portion of the power system.
　地上接続部４３は、ケーブル端末１１Ａ，１１Ｂ，１１Ｃを含む。地中ケーブル１０は、地上接続部４３において、ケーブル端末１１Ａ，１１Ｂ，１１Ｃに接続されている。より詳細には、地中ケーブル１０Ａはケーブル端末１１Ａに接続され、地中ケーブル１０Ｂはケーブル端末１１Ｂに接続され、地中ケーブル１０Ｃはケーブル端末１１Ｃに接続されている。 The ground connection section 43 includes cable terminals 11A, 11B, and 11C. The underground cable 10 is connected to the cable terminals 11A, 11B and 11C at the ground connection portion 43 . More specifically, underground cable 10A is connected to cable terminal 11A, underground cable 10B is connected to cable terminal 11B, and underground cable 10C is connected to cable terminal 11C.
　地上接続部４３は、たとえば、変電所内において、地中ケーブル１０が地上に現れる部分に設けられる。普通接続部４１および絶縁接続部４２は、マンホール３１の内部に設けられる。 The ground connection part 43 is provided, for example, in a substation where the underground cable 10 appears on the ground. The normal connection portion 41 and the insulated connection portion 42 are provided inside the manhole 31 .
　図２は、本開示の実施の形態に係る送電システムに用いられる地中ケーブルの構成の一例を示す図である。図２は、地中ケーブル１０の断面図を示している。図２を参照して、地中ケーブル１０は、中心部から順に、電力を伝送する線状の導体７１と、半導電エチレンプロピレン（ＥＰ；Ｅｔｈｙｌｅｎｅ　Ｐｒｏｐｙｌｅｎｅ）ゴム製の内部半導電層７２と、絶縁層であるＥＰゴム製の絶縁体７３と、半導電テープである外部半導電層７４と、導電性の遮蔽層７５と、ビニル製のシース７６とから構成される。すなわち、内部半導電層７２が導体７１の周囲を覆い、絶縁体７３が内部半導電層７２の周囲を覆い、外部半導電層７４が絶縁体７３の周囲を覆い、導体である遮蔽層７５が外部半導電層７４の周囲を覆い、シース７６が遮蔽層７５の周囲を覆っている。 FIG. 2 is a diagram showing an example of the configuration of underground cables used in the power transmission system according to the embodiment of the present disclosure. FIG. 2 shows a cross-sectional view of underground cable 10 . Referring to FIG. 2, underground cable 10 includes, in order from the center, a linear conductor 71 that transmits electric power, an internal semiconductive layer 72 made of semiconductive ethylene propylene (EP) rubber, and an insulating layer. It consists of an insulator 73 made of EP rubber which is a layer, an outer semiconductive layer 74 which is a semiconductive tape, a conductive shielding layer 75 and a sheath 76 made of vinyl. That is, the inner semiconducting layer 72 surrounds the conductor 71, the insulator 73 surrounds the inner semiconducting layer 72, the outer semiconducting layer 74 surrounds the insulator 73, and the shielding layer 75 which is a conductor Surrounding the outer semi-conducting layer 74 is a sheath 76 surrounding the shielding layer 75 .
　地中ケーブル１０における導体７１は、送電に用いられ、高圧電圧が印加されている。遮蔽層７５は、導電性である一方、地中ケーブル１０の途中で接地されている。このため、遮蔽層７５の電圧は、導体７１と比べて低い。 A conductor 71 in the underground cable 10 is used for power transmission and is applied with a high voltage. The shielding layer 75 is electrically conductive while being grounded in the middle of the underground cable 10 . Therefore, the voltage on shield layer 75 is lower than on conductor 71 .
　送電システム５０２では、一例として、配電方式として３相３線式が用いられる。送電システム５０２では、３相の地中ケーブル１０として、地中ケーブル１０Ａ，１０Ｂ，１０Ｃが設けられる。 In the power transmission system 502, as an example, a 3-phase 3-wire system is used as a power distribution system. In power transmission system 502, underground cables 10A, 10B, and 10C are provided as three-phase underground cables 10. FIG.
　再び図１を参照して、ケーブル端末１１Ａ，１１Ｂ，１１Ｃにおいて、地中ケーブル１０Ａ，１０Ｂ，１０Ｃの各々の遮蔽層７５が露出している。これらの遮蔽層７５における露出部分に、それぞれ端子が設けられる。 Referring to FIG. 1 again, the shielding layers 75 of the underground cables 10A, 10B and 10C are exposed at the cable terminals 11A, 11B and 11C. Terminals are provided in the exposed portions of these shielding layers 75, respectively.
　地中ケーブル１０Ａ，１０Ｂ，１０Ｃは、それぞれ、ケーブル端末１１Ａ，１１Ｂ，１１Ｃにおいて接地ノード１５に接続されている。より詳細には、地中ケーブル１０Ａ，１０Ｂ，１０Ｃの各々に設けられた端子が接地ノード１５に接地用ケーブル１４等を介して接続されることにより、各地中ケーブル１０の遮蔽層７５が接地される。 The underground cables 10A, 10B, 10C are connected to the ground node 15 at cable terminals 11A, 11B, 11C, respectively. More specifically, the shielding layer 75 of each underground cable 10 is grounded by connecting the terminal provided to each of the underground cables 10A, 10B, 10C to the ground node 15 via the grounding cable 14 or the like. be.
　たとえば、地中ケーブル１０は、普通接続部４１および絶縁接続部４２において端部同士が接続された複数のケーブルにより構成される。 For example, the underground cable 10 is composed of a plurality of cables whose ends are connected to each other at normal connection portions 41 and insulated connection portions 42 .
　図３は、本開示の実施の形態に係る送電システムに用いられる普通接続部における地中ケーブルの接続方法の一例を示す図である。図３では、説明を容易にするために、地中ケーブル１０Ａのうちの導体７１および遮蔽層７５を主に示している。以下で説明する内容は、地中ケーブル１０Ｂおよび地中ケーブル１０Ｃについても同様である。 FIG. 3 is a diagram showing an example of a connection method of underground cables in a normal connection section used in the power transmission system according to the embodiment of the present disclosure. FIG. 3 mainly shows the conductor 71 and the shielding layer 75 of the underground cable 10A for ease of explanation. The contents described below are the same for the underground cable 10B and the underground cable 10C.
　図３を参照して、普通接続部４１において、地中ケーブル１０Ａ１，１０Ａ２が接続されている。普通接続部４１において、たとえば、地中ケーブル１０Ａ１，１０Ａ２の導体７１同士の接続部分において地中ケーブル１０Ａ１，１０Ａ２の遮蔽層７５が露出する。普通接続部４１では、地中ケーブル１０Ａ１の遮蔽層７５および地中ケーブル１０Ａ２の遮蔽層７５をたとえば導電性のワイヤ１２を用いて結線する。 With reference to FIG. 3, underground cables 10A1 and 10A2 are connected at a normal connection portion 41. In the normal connection portion 41, for example, the shielding layer 75 of the underground cables 10A1 and 10A2 is exposed at the connection portion between the conductors 71 of the underground cables 10A1 and 10A2. In ordinary connection portion 41, shielding layer 75 of underground cable 10A1 and shielding layer 75 of underground cable 10A2 are connected using conductive wire 12, for example.
　そして、地中ケーブル１０Ａ１の遮蔽層７５および地中ケーブル１０Ａ２の遮蔽層７５が接続される場合、たとえば地中ケーブル１０Ａ２の遮蔽層７５における露出部分に端子８１が設けられる。なお、端子８１は、地中ケーブル１０Ａ１の遮蔽層７５における露出部分に設けられてもよい。そして、端子８１が接地ノード１３にケーブル等を介して接続されることにより、地中ケーブル１０Ａの遮蔽層７５が接地される。 Then, when the shielding layer 75 of the underground cable 10A1 and the shielding layer 75 of the underground cable 10A2 are connected, the terminal 81 is provided at the exposed portion of the shielding layer 75 of the underground cable 10A2, for example. Note that the terminal 81 may be provided at an exposed portion of the shielding layer 75 of the underground cable 10A1. By connecting the terminal 81 to the ground node 13 via a cable or the like, the shielding layer 75 of the underground cable 10A is grounded.
　図４は、本開示の実施の形態に係る送電システムに用いられる絶縁接続部における地中ケーブルの接続方法の一例を示す図である。図４では、説明を容易にするために、地中ケーブル１０Ａの構成のうちの導体７１および遮蔽層７５を主に示している。以下で説明する内容は、地中ケーブル１０Ｂおよび地中ケーブル１０Ｃについても同様である。 FIG. 4 is a diagram showing an example of a connection method of an underground cable at an insulated joint used in the power transmission system according to the embodiment of the present disclosure. FIG. 4 mainly shows the conductor 71 and the shielding layer 75 of the construction of the underground cable 10A for ease of explanation. The contents described below are the same for the underground cable 10B and the underground cable 10C.
　図４を参照して、絶縁接続部４２において、地中ケーブル１０Ａ１，１０Ａ２が接続されている。絶縁接続部４２において、たとえば、地中ケーブル１０Ａ１，１０Ａ２の導体７１同士の接続部分において地中ケーブル１０Ａ１，１０Ａ２の遮蔽層７５が露出し、露出部分に端子８１等がそれぞれ設けられる。 With reference to FIG. 4 , underground cables 10A1 and 10A2 are connected at the insulated connection portion 42 . In the insulated connection portion 42, for example, the shielding layers 75 of the underground cables 10A1 and 10A2 are exposed at the connecting portions between the conductors 71 of the underground cables 10A1 and 10A2, and the terminals 81 and the like are provided at the exposed portions.
　絶縁接続部４２では、地中ケーブル１０Ａ１の導体７１および地中ケーブル１０Ａ２の導体７１が接続される場合、たとえば地中ケーブル１０Ａ１における端子８１と地中ケーブル１０Ａ２における端子８１とをワイヤ１２を用いて結線することにより、地中ケーブル１０Ａ１の遮蔽層７５および地中ケーブル１０Ａ２の遮蔽層７５が接続される。 When the conductor 71 of the underground cable 10A1 and the conductor 71 of the underground cable 10A2 are connected at the insulated connection portion 42, for example, the terminal 81 of the underground cable 10A1 and the terminal 81 of the underground cable 10A2 are connected using the wire 12. The wiring connects the shielding layer 75 of the underground cable 10A1 and the shielding layer 75 of the underground cable 10A2.
　図５は、本開示の実施の形態に係る送電システムに用いられる絶縁接続部における地中ケーブルの接続方法の他の例を示す図である。図５を参照して、絶縁接続部４２において、地中ケーブル１０Ａ１，１０Ａ２が接続され、地中ケーブル１０Ｂ１，１０Ｂ２が接続され、地中ケーブル１０Ｃ１，１０Ｃ２が接続されている。絶縁接続部４２において、たとえば、地中ケーブル１０Ａ１，１０Ａ２の導体７１同士の接続部分において地中ケーブル１０Ａ１，１０Ａ２の遮蔽層７５が露出し、地中ケーブル１０Ｂ１，１０Ｂ２の導体７１同士の接続部分において地中ケーブル１０Ｂ１，１０Ｂ２の遮蔽層７５が露出し、地中ケーブル１０Ｃ１，１０Ｃ２の導体７１同士の接続部分において地中ケーブル１０Ｃ１，１０Ｃ２の遮蔽層７５が露出し、露出部分に端子８１等がそれぞれ設けられる。 FIG. 5 is a diagram showing another example of a connection method of underground cables in the insulated joints used in the power transmission system according to the embodiment of the present disclosure. Referring to FIG. 5 , underground cables 10A1 and 10A2 are connected, underground cables 10B1 and 10B2 are connected, and underground cables 10C1 and 10C2 are connected at insulating connection portion 42 . In the insulated connection portion 42, for example, the shielding layer 75 of the underground cables 10A1 and 10A2 is exposed at the connection portion between the conductors 71 of the underground cables 10A1 and 10A2, and at the connection portion between the conductors 71 of the underground cables 10B1 and 10B2 The shielding layers 75 of the underground cables 10B1 and 10B2 are exposed, the shielding layers 75 of the underground cables 10C1 and 10C2 are exposed at the connecting portions between the conductors 71 of the underground cables 10C1 and 10C2, and the terminals 81 and the like are provided at the exposed portions. be provided.
　絶縁接続部４２では、たとえば、地中ケーブル１０Ａ１における端子８１と地中ケーブル１０Ｂ２における端子８１とをワイヤ１２を用いて結線することにより、地中ケーブル１０Ａ１の遮蔽層７５および地中ケーブル１０Ｂ２の遮蔽層７５が接続され、地中ケーブル１０Ｂ１における端子８１と地中ケーブル１０Ｃ２における端子８１とをワイヤ１２を用いて結線することにより、地中ケーブル１０Ｂ１の遮蔽層７５および地中ケーブル１０Ｃ２の遮蔽層７５が接続され、上記地中ケーブル１０Ｃ１における端子８１と地中ケーブル１０Ａ２における端子８１とをワイヤ１２を用いて結線することにより、地中ケーブル１０Ｃ１の遮蔽層７５および地中ケーブル１０Ａ２の遮蔽層７５が接続される。 In the insulating connection portion 42, for example, by connecting the terminal 81 of the underground cable 10A1 and the terminal 81 of the underground cable 10B2 using the wire 12, the shielding layer 75 of the underground cable 10A1 and the shielding of the underground cable 10B2 are connected. Shielding layer 75 of underground cable 10B1 and shielding layer 75 of underground cable 10C2 are connected by connecting terminal 81 of underground cable 10B1 and terminal 81 of underground cable 10C2 using wire 12. are connected, and by connecting the terminal 81 of the underground cable 10C1 and the terminal 81 of the underground cable 10A2 using the wire 12, the shielding layer 75 of the underground cable 10C1 and the shielding layer 75 of the underground cable 10A2 are Connected.
　このように、送電システム５０２では、絶縁接続部４２において、地中ケーブル１０がクロスボンド接続されてもよい。 Thus, in the power transmission system 502 , the underground cable 10 may be cross-bonded at the insulated connection portion 42 .
　［ケーブル監視システム］
　図６は、本開示の実施の形態に係るケーブル監視システムの構成を示す図である。図６では、説明を容易にするために、地中ケーブル１０のうち地中ケーブル１０Ａを主に示している。以下で説明する内容は、地中ケーブル１０Ｂおよび地中ケーブル１０Ｃについても同様である。 [Cable monitoring system]
FIG. 6 is a diagram showing the configuration of the cable monitoring system according to the embodiment of the present disclosure. FIG. 6 mainly shows an underground cable 10A of the underground cables 10 for ease of explanation. The contents described below are the same for the underground cable 10B and the underground cable 10C.
　図６を参照して、ケーブル監視システム５０１は、ケーブル監視装置５００Ａ，５００Ｂ，５００Ｃ，５００Ｄと、管理装置４００とを備える。以下、ケーブル監視装置５００Ａ，５００Ｂ，５００Ｃ，５００Ｄの各々を、ケーブル監視装置５００とも称する。ケーブル監視システム５０１は、送電システム５０２において用いられる。 With reference to FIG. 6, the cable monitoring system 501 includes cable monitoring devices 500A, 500B, 500C, and 500D and a management device 400. Each of the cable monitoring devices 500A, 500B, 500C, and 500D is also referred to as a cable monitoring device 500 hereinafter. Cable monitoring system 501 is used in transmission system 502 .
　ケーブル監視装置５００は、互いに異なる位置に設置される。ケーブル監視装置５００は、たとえば絶縁接続部４２および地上接続部４３に対応して設けられる。図６に示す例では、ケーブル監視装置５００Ａは、絶縁接続部４２Ａに対応して設けられており、ケーブル監視装置５００Ｂは、絶縁接続部４２Ｂに対応して設けられており、ケーブル監視装置５００Ｃは、絶縁接続部４２Ｃに対応して設けられており、ケーブル監視装置５００Ｄは、地上接続部４３Ａに対応して設けられている。また、管理装置４００は、ケーブル監視装置５００Ｄに接続されている。 The cable monitoring devices 500 are installed at different positions. Cable monitoring device 500 is provided, for example, corresponding to insulated connection portion 42 and ground connection portion 43 . In the example shown in FIG. 6, the cable monitoring device 500A is provided corresponding to the insulating connection portion 42A, the cable monitoring device 500B is provided corresponding to the insulating connection portion 42B, and the cable monitoring device 500C is provided corresponding to the insulating connection portion 42B. , the insulated connection portion 42C, and the cable monitoring device 500D is provided corresponding to the ground connection portion 43A. The management device 400 is also connected to a cable monitoring device 500D.
　ケーブル監視装置５００は、監視対象となるケーブルの一例である地中ケーブル１０Ａを監視する。より詳細には、４つのケーブル監視装置５００は、設置位置の近傍において地中ケーブル１０Ａを監視する。ケーブル監視装置５００は、地中ケーブル１０Ａを監視することにより地中ケーブル１０Ａにおける部分放電および絶縁破壊を検出する。なお、ケーブル監視装置５００の監視対象は、地中ケーブルに限定されず、地中以外の場所に設けられるケーブルであってもよい。 The cable monitoring device 500 monitors the underground cable 10A, which is an example of a cable to be monitored. More specifically, the four cable monitoring devices 500 monitor the underground cable 10A in the vicinity of the installation position. The cable monitoring device 500 detects partial discharge and dielectric breakdown in the underground cable 10A by monitoring the underground cable 10A. Note that the monitoring target of the cable monitoring device 500 is not limited to underground cables, and may be cables provided in places other than underground.
　ケーブル監視装置５００は、地中ケーブル１０Ａにおける遮蔽層７５との誘導結合により地中ケーブル１０Ａを介して互いに通信可能である。ケーブル監視装置５００は、たとえば、スマートメータ等の通信に用いられる低周波ＰＬＣ（Ｐｏｗｅｒ　Ｌｉｎｅ　Ｃｏｍｍｕｎｉｃａｔｉｏｎ）を用いて、２０ｋｂｐｓ～１３０ｋｂｐｓの可変伝送速度で数ｋｍの距離までの通信を行うことができる。あるいは、ケーブル監視装置５００は、高周波ＰＬＣを用いて、最大２００Ｍｂｐｓの伝送速度でより短距離の通信を行うことができる。 The cable monitoring devices 500 can communicate with each other via the underground cable 10A by inductive coupling with the shielding layer 75 of the underground cable 10A. The cable monitoring device 500 can perform communication up to a distance of several kilometers at a variable transmission rate of 20 kbps to 130 kbps using, for example, a low-frequency PLC (Power Line Communication) used for communication such as a smart meter. Alternatively, the cable monitoring device 500 can use a high frequency PLC to communicate over shorter distances at transmission speeds up to 200 Mbps.
　たとえば、ケーブル監視装置５００は、地中ケーブル１０Ａにおける部分放電の検出結果を管理装置４００へ通知する。また、たとえば、ケーブル監視装置５００は、地中ケーブル１０Ａにおける絶縁破壊の検出結果を管理装置４００へ通知する。ケーブル監視装置５００は、他のケーブル監視装置５００からの検出結果の通知を他のケーブル監視装置５００または管理装置４００へ中継することができる。たとえば、ケーブル監視装置５００Ａ，５００Ｂ，５００Ｃは、ケーブル監視装置５００Ｄを含む他のケーブル監視装置５００経由で検出結果を管理装置４００へ通知する。また、たとえば、ケーブル監視装置５００Ｄは、検出結果を直接管理装置４００へ通知する。 For example, the cable monitoring device 500 notifies the management device 400 of the partial discharge detection result in the underground cable 10A. Also, for example, the cable monitoring device 500 notifies the management device 400 of the detection result of dielectric breakdown in the underground cable 10A. The cable monitoring device 500 can relay the notification of the detection result from the other cable monitoring device 500 to the other cable monitoring device 500 or the management device 400 . For example, cable monitoring devices 500A, 500B, and 500C notify management device 400 of detection results via other cable monitoring devices 500 including cable monitoring device 500D. Also, for example, the cable monitoring device 500D directly notifies the management device 400 of the detection result.
　管理装置４００は、ケーブル監視装置５００から通知された部分放電の検出結果に基づいて、地中ケーブル１０Ａにおける部分放電の発生位置を算出する、すなわち部分放電の発生位置を標定する。また、管理装置４００は、ケーブル監視装置５００から通知された絶縁破壊の検出結果に基づいて、地中ケーブル１０Ａにおける絶縁破壊の発生位置を算出する、すなわち絶縁破壊の発生位置を標定する。 Based on the partial discharge detection result notified from the cable monitoring device 500, the management device 400 calculates the position of occurrence of partial discharge in the underground cable 10A, that is, locates the position of occurrence of partial discharge. In addition, the management device 400 calculates the occurrence position of the insulation breakdown in the underground cable 10A based on the detection result of the insulation breakdown notified from the cable monitoring device 500, that is, locates the occurrence position of the insulation breakdown.
　たとえば、地中ケーブル１０Ａには電源コイルが取り付けられる。電源コイルには、地中ケーブル１０の導体７１を通して流れる電流による誘導電流が流れる。これにより、電源コイルは、電流を取り出すことができる。ケーブル監視装置５００は、たとえば電源コイルによって得られた電力により動作する。 For example, a power coil is attached to the underground cable 10A. An induced current due to the current flowing through the conductor 71 of the underground cable 10 flows through the power supply coil. This allows the power coil to draw current. Cable monitoring device 500 operates by power obtained by, for example, a power supply coil.
　［ケーブル監視装置］
　図７は、本開示の実施の形態に係るケーブル監視装置の構成を示す図である。図７を参照して、ケーブル監視装置５００は、信号検出部１００と、異常検出部２００と、電磁結合部３００と、通信部３３１と、同期部３３２と、カウンタ３３３とを備える。通信部３３１は、通知部の一例である。信号検出部１００は、カレントトランス１１０と、信号出力部１２０とを含む。電磁結合部３００は、カレントトランス３１０と、信号入出力部３２０とを含む。以下、カレントトランス１１０をＣＴ１１０とも称し、カレントトランス３１０をＣＴ３１０とも称する。 [Cable monitoring device]
FIG. 7 is a diagram showing the configuration of the cable monitoring device according to the embodiment of the present disclosure. Referring to FIG. 7 , cable monitoring device 500 includes signal detection section 100 , abnormality detection section 200 , electromagnetic coupling section 300 , communication section 331 , synchronization section 332 and counter 333 . Communication unit 331 is an example of a notification unit. Signal detection section 100 includes a current transformer 110 and a signal output section 120 . Electromagnetic coupling section 300 includes a current transformer 310 and a signal input/output section 320 . Hereinafter, the current transformer 110 is also referred to as CT110, and the current transformer 310 is also referred to as CT310.
　カウンタ３３３は、たとえば、水晶振動子を用いた発振回路等により生成されるクロックパルスをカウントし、カウントした値を示す時刻情報を保持する。この時刻情報は、たとえば現在時刻を示す。 The counter 333 counts clock pulses generated by, for example, an oscillator circuit using a crystal oscillator, and holds time information indicating the counted value. This time information indicates, for example, the current time.
　信号検出部１００および電磁結合部３００は、たとえば、地中ケーブル１０Ａの接続部である絶縁接続部４２において遮蔽層７５と電磁結合する。 The signal detection unit 100 and the electromagnetic coupling unit 300 are electromagnetically coupled with the shielding layer 75 at the insulating connection unit 42, which is the connection portion of the underground cable 10A, for example.
　信号検出部１００は、地中ケーブル１０Ａの遮蔽層７５を通して流れる電流の変化に応じた出力信号を出力する。より詳細には、信号検出部１００は、地中ケーブル１０の遮蔽層７５を通して流れる電流の誘導電流に応じたアナログ信号である出力信号を異常検出部２００へ出力する。 The signal detection unit 100 outputs an output signal according to changes in current flowing through the shielding layer 75 of the underground cable 10A. More specifically, the signal detection unit 100 outputs to the abnormality detection unit 200 an output signal that is an analog signal corresponding to the induced current of the current flowing through the shielding layer 75 of the underground cable 10 .
　異常検出部２００は、信号検出部１００から出力される出力信号に基づいて、地中ケーブル１０Ａにおける部分放電および絶縁破壊を検出する。より詳細には、異常検出部２００は、信号検出部１００から受けた出力信号に基づいて、地中ケーブル１０Ａにおける部分放電および絶縁破壊が発生したか否かを判定する判定処理を行う。たとえば、異常検出部２００は、地中ケーブル１０Ａにおける部分放電を検出した場合、部分放電の検出時刻および自己のケーブル監視装置５００のＩＤを含む検出情報ＤＡを通信部３３１へ出力する。また、たとえば、異常検出部２００は、地中ケーブル１０Ａにおける絶縁破壊を検出した場合、絶縁破壊の検出時刻および自己のケーブル監視装置５００のＩＤを含む検出情報ＤＢを通信部３３１へ出力する。検出情報ＤＡは、第１検出情報の一例である。検出情報ＤＢは、第２検出情報の一例である。 The abnormality detection section 200 detects partial discharge and dielectric breakdown in the underground cable 10A based on the output signal output from the signal detection section 100. More specifically, based on the output signal received from the signal detection unit 100, the abnormality detection unit 200 performs determination processing to determine whether partial discharge and dielectric breakdown have occurred in the underground cable 10A. For example, when detecting partial discharge in the underground cable 10A, the abnormality detection unit 200 outputs detection information DA including the partial discharge detection time and the ID of the own cable monitoring device 500 to the communication unit 331 . Further, for example, when detecting a dielectric breakdown in the underground cable 10</b>A, the abnormality detection section 200 outputs a detection information DB including the dielectric breakdown detection time and the ID of its own cable monitoring device 500 to the communication section 331 . Detection information DA is an example of first detection information. The detection information DB is an example of second detection information.
　通信部３３１は、電磁結合部３００の電磁結合により遮蔽層７５を通して流れる誘導電流を用いて、他のケーブル監視装置５００の間で通信情報の送受信を行うことが可能である。また、ケーブル監視装置５００Ｄにおける通信部３３１は、図示しない通信線を介して管理装置４００と接続されている。ケーブル監視装置５００Ｄにおける通信部３３１は、他のケーブル監視装置５００から受信した通信情報を当該通信線経由で管理装置４００へ中継する。たとえば、ケーブル監視装置５００Ｄにおける通信部３３１は、ＰＬＣ通信における親局であり、ケーブル監視装置５００Ａ，５００Ｂ，５００Ｃにおける通信部３３１は、ＰＬＣ通信における子局である。 The communication unit 331 can transmit and receive communication information between the other cable monitoring devices 500 using the induced current flowing through the shielding layer 75 due to the electromagnetic coupling of the electromagnetic coupling unit 300 . Also, the communication unit 331 in the cable monitoring device 500D is connected to the management device 400 via a communication line (not shown). The communication unit 331 in the cable monitoring device 500D relays communication information received from another cable monitoring device 500 to the management device 400 via the communication line. For example, the communication unit 331 in the cable monitoring device 500D is a master station in PLC communication, and the communication units 331 in the cable monitoring devices 500A, 500B, and 500C are slave stations in PLC communication.
　たとえば、通信部３３１は、異常検出部２００が部分放電を検出した時刻を他の装置たとえば管理装置４００へ通知する。また、通信部３３１は、異常検出部２００が絶縁放電を検出した時刻を他の装置たとえば管理装置４００へ通知する。より詳細には、通信部３３１は、異常検出部２００から検出情報ＤＡを受けて、受けた検出情報ＤＡを上記通信線経由で、またはケーブル監視装置５００Ｄを含む他のケーブル監視装置５００および上記通信線経由で管理装置４００へ伝送する。また、通信部３３１は、異常検出部２００から検出情報ＤＢを受けて、受けた検出情報ＤＢを上記通信線経由で、またはケーブル監視装置５００Ｄを含む他のケーブル監視装置５００および上記通信線経由で管理装置４００へ伝送する。検出情報ＤＡ，ＤＢは、通信情報の一例である。 For example, the communication unit 331 notifies another device, such as the management device 400, of the time when the abnormality detection unit 200 detects partial discharge. Further, the communication unit 331 notifies another device, for example, the management device 400 of the time when the abnormality detection unit 200 detects insulation discharge. More specifically, the communication unit 331 receives the detection information DA from the abnormality detection unit 200 and transmits the received detection information DA via the communication line or through the other cable monitoring devices 500 including the cable monitoring device 500D and the communication device 500D. It transmits to the management device 400 via a line. Further, the communication unit 331 receives the detection information DB from the abnormality detection unit 200, and transmits the received detection information DB via the communication line, or via other cable monitoring devices 500 including the cable monitoring device 500D and the communication line. It transmits to the management device 400 . The detection information DA and DB are examples of communication information.
　＜信号検出部および電磁結合部＞
　図８は、本開示の実施の形態に係るケーブル監視装置におけるＣＴの構成を示す図である。図８を参照して、ＣＴ１１０は、リングコア１０１と、巻線１０２とを含む。リングコア１０１には、巻線１０２が巻かれている。巻線１０２は、信号出力部１２０に接続されている。リングコア１０１における巻線１０２の巻き数は、たとえば３ターン～７ターンである。 <Signal detector and electromagnetic coupling>
FIG. 8 is a diagram showing the configuration of CT in the cable monitoring device according to the embodiment of the present disclosure. Referring to FIG. 8, CT 110 includes ring core 101 and winding 102 . A winding 102 is wound around the ring core 101 . Winding 102 is connected to signal output section 120 . The number of turns of winding 102 in ring core 101 is, for example, 3 to 7 turns.
　ＣＴ１１０は、たとえば、導電ケーブル５３がリングコア１０１を貫通するように取り付けられる。導電ケーブル５３は、たとえばワイヤ１２または接地用ケーブル１４である。より詳細には、再び図４および図６を参照して、絶縁接続部４２Ａ，４２Ｂ，４２Ｃにおけるケーブル監視装置５００Ａ，５００Ｂ，５００ＣのＣＴ１１０は、地中ケーブル１０Ａ１の遮蔽層７５および地中ケーブル１０Ａ２の遮蔽層７５を接続するワイヤ１２がリングコア１０１を貫通するように取り付けられる。また、地上接続部４３Ａにおけるケーブル監視装置５００ＤのＣＴ１１０は、接地用ケーブル１４がリングコア１０１を貫通するように取り付けられる。遮蔽層７５および導電ケーブル５３を通して電流が流れると、誘導結合により、巻線１０２を通して誘導電流が流れる。信号出力部１２０は、巻線１０２を通して流れる当該誘導電流に応じた出力信号を異常検出部２００へ出力する。 The CT 110 is attached so that the conductive cable 53 penetrates the ring core 101, for example. Conductive cable 53 is, for example, wire 12 or grounding cable 14 . More specifically, referring again to FIGS. 4 and 6, the CTs 110 of the cable monitoring devices 500A, 500B, 500C at the insulated connections 42A, 42B, 42C are connected to the shield layer 75 of underground cable 10A1 and underground cable 10A2. A wire 12 connecting the shielding layers 75 of the ring core 101 is attached so as to pass through the ring core 101 . Also, the CT 110 of the cable monitoring device 500D in the ground connection portion 43A is attached so that the grounding cable 14 penetrates the ring core 101. As shown in FIG. When current flows through shield layer 75 and conductive cable 53 , inductive coupling causes an induced current to flow through winding 102 . Signal output section 120 outputs an output signal corresponding to the induced current flowing through winding 102 to abnormality detection section 200 .
　また、ＣＴ３１０は、リングコア３０１と、巻線３０２とを含む。リングコア３０１には、巻線３０２が巻かれている。巻線３０２は、信号入出力部３２０に接続されている。リングコア３０１における巻線３０２の巻き数は、たとえば３ターン～７ターンである。 CT 310 also includes ring core 301 and winding 302 . A winding 302 is wound around the ring core 301 . Winding 302 is connected to signal input/output section 320 . The number of turns of winding 302 in ring core 301 is, for example, 3 to 7 turns.
　ＣＴ３１０は、たとえば、導電ケーブル５３がリングコア３０１を貫通するように取り付けられる。より詳細には、絶縁接続部４２Ａ，４２Ｂ，４２Ｃにおけるケーブル監視装置５００Ａ，５００Ｂ，５００ＣのＣＴ３１０は、地中ケーブル１０Ａ１の遮蔽層７５および地中ケーブル１０Ａ２の遮蔽層７５を接続するワイヤ１２がリングコア３０１を貫通するように取り付けられる。また、地上接続部４３Ａにおけるケーブル監視装置５００ＤのＣＴ３１０は、接地用ケーブル１４がリングコア３０１を貫通するように取り付けられる。なお、ＣＴ１１０，３１０のサイズは、同じであってもよいし、異なっていてもよい。 The CT 310 is attached so that the conductive cable 53 penetrates the ring core 301, for example. More specifically, in the CTs 310 of the cable monitoring devices 500A, 500B, and 500C in the insulated connection portions 42A, 42B, and 42C, the wire 12 connecting the shield layer 75 of the underground cable 10A1 and the shield layer 75 of the underground cable 10A2 is a ring core. It is attached so as to pass through 301 . Also, the CT 310 of the cable monitoring device 500D in the ground connection portion 43A is attached so that the grounding cable 14 penetrates the ring core 301. As shown in FIG. Note that the sizes of the CTs 110 and 310 may be the same or different.
　通信部３３１は、他のケーブル監視装置５００または管理装置４００へ伝送すべき通信情報を含む送信信号を生成し、生成した送信信号を電磁結合部３００へ出力する。 The communication unit 331 generates a transmission signal including communication information to be transmitted to the other cable monitoring device 500 or the management device 400 and outputs the generated transmission signal to the electromagnetic coupling unit 300.
　信号入出力部３２０は、通信部３３１から送信信号を受けて、受けた送信信号に応じた電流を巻線３０２に流す。巻線３０２を通して電流が流れると、誘導結合により、導電ケーブル５３および遮蔽層７５を通して誘導電流が流れる。以下、信号入出力部３２０が巻線３０２を通して電流を流すことにより遮蔽層７５を通して流れる当該誘導電流を、通信誘導電流とも称する。 The signal input/output unit 320 receives a transmission signal from the communication unit 331 and causes a current corresponding to the received transmission signal to flow through the winding 302 . When current flows through winding 302 , inductive coupling causes an induced current to flow through conductive cable 53 and shield layer 75 . Hereinafter, the induced current that flows through the shielding layer 75 when the signal input/output unit 320 causes the current to flow through the winding 302 is also referred to as a communication induced current.
　また、遮蔽層７５および導電ケーブル５３を通して他のケーブル監視装置５００からの通信誘導電流が流れると、誘導結合により、巻線１０２を通して誘導電流が流れる。信号入出力部３２０は、巻線１０２を通して流れる当該誘導電流に応じたアナログ信号である受信信号を通信部３３１へ出力する。通信部３３１は、信号入出力部３２０から受けた受信信号から、他のケーブル監視装置５００からの通信情報を取得する。 Also, when a communication induced current from another cable monitoring device 500 flows through the shield layer 75 and the conductive cable 53, an induced current flows through the winding 102 due to inductive coupling. Signal input/output unit 320 outputs a reception signal, which is an analog signal corresponding to the induced current flowing through winding 102 , to communication unit 331 . The communication unit 331 acquires communication information from another cable monitoring device 500 from the received signal received from the signal input/output unit 320 .
　たとえば、通信部３３１が通信情報の送受信に用いる通信誘導電流の帯域と、異常検出部２００が部分放電および絶縁破壊の検出に用いる出力信号の帯域とは異なる。したがって、通信部３３１および異常検出部２００は、通信情報の伝送ならびに部分放電および絶縁破壊の検出を並行して行うことが可能である。また、通信部３３１は、地中ケーブル１０Ａにおいて絶縁破壊が発生した場合であっても、たとえば遮蔽層７５が完全に切断されない状態において、通信情報の伝送を行うことが可能である。 For example, the band of the communication induced current used by the communication unit 331 to transmit and receive communication information differs from the band of the output signal used by the abnormality detection unit 200 to detect partial discharge and dielectric breakdown. Therefore, the communication unit 331 and the abnormality detection unit 200 can transmit communication information and detect partial discharge and dielectric breakdown in parallel. In addition, even when dielectric breakdown occurs in the underground cable 10A, the communication unit 331 can transmit communication information, for example, in a state in which the shielding layer 75 is not completely cut.
　図９は、本開示の実施の形態の変形例に係るケーブル監視装置の構成を示す図である。図９を参照して、ケーブル監視装置５１０は、信号検出部１００Ａと、異常検出部２００と、電磁結合部３００と、通信部３３１と、同期部３３２と、カウンタ３３３とを備える。ケーブル監視システム５０１は、ケーブル監視装置５００の代わりにケーブル監視装置５１０を備える構成であってもよい。 FIG. 9 is a diagram showing the configuration of a cable monitoring device according to a modification of the embodiment of the present disclosure. Referring to FIG. 9 , cable monitoring device 510 includes a signal detection unit 100A, an abnormality detection unit 200, an electromagnetic coupling unit 300, a communication unit 331, a synchronization unit 332, and a counter 333. Cable monitoring system 501 may be configured to include cable monitoring device 510 instead of cable monitoring device 500 .
　信号検出部１００Ａは、地中ケーブル１０の遮蔽層７５の電位の変化に応じた出力信号を出力する。より詳細には、信号検出部１００Ａは、金属箔電極１０５，１０６と、信号出力部１２０Ａとを含む。信号検出部１００Ａは、たとえば、地中ケーブル１０の接続部である絶縁接続部４２において遮蔽層７５と静電結合する。 The signal detection unit 100A outputs an output signal according to the change in potential of the shielding layer 75 of the underground cable 10. More specifically, signal detection section 100A includes metal foil electrodes 105 and 106 and signal output section 120A. The signal detection unit 100A is electrostatically coupled to the shield layer 75 at the insulating connection portion 42, which is the connection portion of the underground cable 10, for example.
　図１０は、本開示の実施の形態に係るケーブル監視装置における金属箔電極の取り付け例を示す図である。図９および図１０を参照して、金属箔電極１０５，１０６は、信号出力部１２０Ａに接続されている。 FIG. 10 is a diagram showing an example of attachment of metal foil electrodes in the cable monitoring device according to the embodiment of the present disclosure. 9 and 10, metal foil electrodes 105 and 106 are connected to signal output section 120A.
　金属箔電極１０５，１０６は、たとえば、絶縁接続部４２における絶縁筒７７を介して互いに反対側において、地中ケーブル１０のシース７６の表面に貼り付けられる。より詳細には、たとえば地中ケーブル１０Ａ１，１０Ａ２が接続される絶縁接続部４２において、金属箔電極１０５は、地中ケーブル１０Ａ１のシース７６の表面に貼り付けられ、金属箔電極１０６は、地中ケーブル１０Ａ２のシース７６の表面に貼り付けられる。なお、金属箔電極１０５，１０６は、地中ケーブル１０Ａ２のシース７６の外周を覆うように貼り付けられてもよい。また、各金属箔電極が貼り付けられる位置および金属箔電極の個数は限定されず、３つ以上の金属箔電極が貼り付けられてもよい。 For example, the metal foil electrodes 105 and 106 are attached to the surface of the sheath 76 of the underground cable 10 on opposite sides of the insulating connection portion 42 via the insulating cylinder 77 . More specifically, for example, at the insulating connection portion 42 to which the underground cables 10A1 and 10A2 are connected, the metal foil electrode 105 is attached to the surface of the sheath 76 of the underground cable 10A1, and the metal foil electrode 106 is attached to the surface of the sheath 76 of the underground cable 10A1. It is attached to the surface of the sheath 76 of the cable 10A2. Note that the metal foil electrodes 105 and 106 may be attached so as to cover the outer circumference of the sheath 76 of the underground cable 10A2. Moreover, the position to which each metal foil electrode is attached and the number of metal foil electrodes are not limited, and three or more metal foil electrodes may be attached.
　遮蔽層７５および導電ケーブル５３の電位が変化すると、電界結合により、金属箔電極１０５，１０６を通して電流が流れる。信号出力部１２０Ａは、当該電流に基づく、遮蔽層７５の電位の変化に応じたアナログ信号である出力信号を異常検出部２００へ出力する。 When the potential of the shield layer 75 and the conductive cable 53 changes, electric field coupling causes current to flow through the metal foil electrodes 105 and 106 . The signal output unit 120A outputs to the abnormality detection unit 200 an output signal, which is an analog signal corresponding to the change in the potential of the shielding layer 75 based on the current.
　＜同期部＞
　再び図７および図９を参照して、同期部３３２は、地中ケーブル１０Ａを監視する他のケーブル監視装置５００との通信により他のケーブル監視装置５００との時刻同期をとるための処理を行う。より詳細には、同期部３３２は、たとえば定期的に、カウンタ３３３の時刻情報を他のケーブル監視装置５００と合わせるための処理である同期処理を行う。 <Synchronization section>
Referring to FIGS. 7 and 9 again, synchronization unit 332 performs processing for synchronizing time with another cable monitoring device 500 that monitors underground cable 10A through communication with other cable monitoring device 500. . More specifically, the synchronizing unit 332 periodically performs a synchronizing process for synchronizing the time information of the counter 333 with that of another cable monitoring device 500 .
　たとえば、ケーブル監視装置５００Ｄは、マスタ装置として機能する。ケーブル監視装置５００Ｄにおける同期部３３２は、所定周期に従う同期処理タイミングにおいて、カウンタ３３３の時刻情報を取得し、取得した時刻情報を通信部３３１へ出力する。ケーブル監視装置５００Ｄにおける通信部３３１は、同期部３３２から時刻情報を受けて、受けた時刻情報をケーブル監視装置５００Ａへ伝送する。時刻情報は、通信情報の一例である。 For example, the cable monitoring device 500D functions as a master device. Synchronization section 332 in cable monitoring device 500</b>D acquires the time information of counter 333 and outputs the acquired time information to communication section 331 at synchronization processing timing according to a predetermined cycle. The communication unit 331 in the cable monitoring device 500D receives the time information from the synchronization unit 332 and transmits the received time information to the cable monitoring device 500A. Time information is an example of communication information.
　ケーブル監視装置５００Ａにおいて、通信部３３１は、ケーブル監視装置５００Ｄにおける通信部３３１から電磁結合部３００経由で時刻情報を受信し、受信した時刻情報を同期部３３２へ出力する。同期部３３２は、カウンタ３３３の時刻情報を、通信部３３１から受けた時刻情報に更新する。また、同期部３３２は、カウンタ３３３の更新後の時刻情報を取得し、取得した時刻情報を通信部３３１へ出力する。通信部３３１は、同期部３３２から時刻情報を受けて、受けた時刻情報をケーブル監視装置５００Ｄ，５００Ｂへ伝送する。 In the cable monitoring device 500A, the communication unit 331 receives time information from the communication unit 331 in the cable monitoring device 500D via the electromagnetic coupling unit 300, and outputs the received time information to the synchronization unit 332. Synchronization unit 332 updates the time information of counter 333 to the time information received from communication unit 331 . The synchronization unit 332 also acquires time information after the counter 333 is updated, and outputs the acquired time information to the communication unit 331 . The communication unit 331 receives time information from the synchronization unit 332 and transmits the received time information to the cable monitoring devices 500D and 500B.
　ケーブル監視装置５００Ｂにおいて、通信部３３１は、ケーブル監視装置５００Ａにおける通信部３３１から電磁結合部３００経由で時刻情報を受信し、受信した時刻情報を同期部３３２へ出力する。同期部３３２は、カウンタ３３３の時刻情報を、通信部３３１から受けた時刻情報に更新する。また、同期部３３２は、カウンタ３３３の更新後の時刻情報を取得し、取得した時刻情報を通信部３３１へ出力する。通信部３３１は、同期部３３２から時刻情報を受けて、受けた時刻情報をケーブル監視装置５００Ａ，５００Ｃへ伝送する。 In the cable monitoring device 500B, the communication unit 331 receives time information from the communication unit 331 in the cable monitoring device 500A via the electromagnetic coupling unit 300, and outputs the received time information to the synchronization unit 332. Synchronization unit 332 updates the time information of counter 333 to the time information received from communication unit 331 . The synchronization unit 332 also acquires time information after the counter 333 is updated, and outputs the acquired time information to the communication unit 331 . Communication unit 331 receives the time information from synchronization unit 332 and transmits the received time information to cable monitoring devices 500A and 500C.
　ケーブル監視装置５００Ｃにおいて、通信部３３１は、ケーブル監視装置５００Ｂにおける通信部３３１から電磁結合部３００経由で時刻情報を受信し、受信した時刻情報を同期部３３２へ出力する。同期部３３２は、カウンタ３３３の時刻情報を、通信部３３１から受けた時刻情報に更新する。また、同期部３３２は、カウンタ３３３の更新後の時刻情報を取得し、取得した時刻情報を通信部３３１へ出力する。通信部３３１は、同期部３３２から時刻情報を受けて、受けた時刻情報をケーブル監視装置５００Ｂへ伝送する。 In the cable monitoring device 500C, the communication unit 331 receives time information from the communication unit 331 in the cable monitoring device 500B via the electromagnetic coupling unit 300, and outputs the received time information to the synchronization unit 332. Synchronization unit 332 updates the time information of counter 333 to the time information received from communication unit 331 . The synchronization unit 332 also acquires time information after the counter 333 is updated, and outputs the acquired time information to the communication unit 331 . The communication unit 331 receives the time information from the synchronization unit 332 and transmits the received time information to the cable monitoring device 500B.
　ケーブル監視装置５００Ｄにおける通信部３３１は、ケーブル監視装置５００Ａにおける通信部３３１から電磁結合部３００経由で時刻情報を受信し、受信した時刻情報と、カウンタ３３３の現在の時刻情報との差分の１／２を算出する。当該差分は、ケーブル監視装置５００Ｄとケーブル監視装置５００Ａとの間の往復伝送遅延時間を示し、当該差分の１／２は、ケーブル監視装置５００Ｄとケーブル監視装置５００Ａとの間の伝送遅延時間を示す。ケーブル監視装置５００Ｄにおける通信部３３１は、算出した伝送遅延時間を示す遅延時間情報Ｄ１を管理装置４００へ伝送する。 The communication unit 331 in the cable monitoring device 500D receives time information from the communication unit 331 in the cable monitoring device 500A via the electromagnetic coupling unit 300, and 1/ of the difference between the received time information and the current time information of the counter 333. 2 is calculated. The difference indicates the round-trip transmission delay time between the cable monitoring device 500D and the cable monitoring device 500A, and 1/2 of the difference indicates the transmission delay time between the cable monitoring device 500D and the cable monitoring device 500A. . The communication unit 331 in the cable monitoring device 500</b>D transmits delay time information D<b>1 indicating the calculated transmission delay time to the management device 400 .
　また、ケーブル監視装置５００Ａにおける通信部３３１は、ケーブル監視装置５００Ｂにおける通信部３３１から電磁結合部３００経由で時刻情報を受信し、受信した時刻情報と、カウンタ３３３の現在の時刻情報との差分の１／２を算出する。当該差分は、ケーブル監視装置５００Ａとケーブル監視装置５００Ｂとの間の往復伝送遅延時間を示し、当該差分の１／２は、ケーブル監視装置５００Ａとケーブル監視装置５００Ｂとの間の伝送遅延時間を示す。ケーブル監視装置５００Ａにおける通信部３３１は、算出した伝送遅延時間を示す遅延時間情報Ｄ２をケーブル監視装置５００Ｄ経由で管理装置４００へ伝送する。 Further, the communication unit 331 in the cable monitoring device 500A receives the time information from the communication unit 331 in the cable monitoring device 500B via the electromagnetic coupling unit 300, and calculates the difference between the received time information and the current time information of the counter 333. Calculate 1/2. The difference indicates the round-trip transmission delay time between the cable monitoring device 500A and the cable monitoring device 500B, and 1/2 of the difference indicates the transmission delay time between the cable monitoring device 500A and the cable monitoring device 500B. . The communication unit 331 in the cable monitoring device 500A transmits delay time information D2 indicating the calculated transmission delay time to the management device 400 via the cable monitoring device 500D.
　また、ケーブル監視装置５００Ｂにおける通信部３３１は、ケーブル監視装置５００Ｃにおける通信部３３１から電磁結合部３００経由で時刻情報を受信し、受信した時刻情報と、カウンタ３３３の現在の時刻情報との差分の１／２を算出する。当該差分は、ケーブル監視装置５００Ｂとケーブル監視装置５００Ｃとの間の往復伝送遅延時間を示し、当該差分の１／２は、ケーブル監視装置５００Ｂとケーブル監視装置５００Ｃとの間の伝送遅延時間を示す。ケーブル監視装置５００Ｂにおける通信部３３１は、算出した伝送遅延時間を示す遅延時間情報Ｄ３をケーブル監視装置５００Ａ，５００Ｄ経由で管理装置４００へ伝送する。 Further, the communication unit 331 in the cable monitoring device 500B receives time information from the communication unit 331 in the cable monitoring device 500C via the electromagnetic coupling unit 300, and calculates the difference between the received time information and the current time information of the counter 333. Calculate 1/2. The difference indicates the round-trip transmission delay time between the cable monitoring device 500B and the cable monitoring device 500C, and 1/2 of the difference indicates the transmission delay time between the cable monitoring device 500B and the cable monitoring device 500C. . The communication unit 331 in the cable monitoring device 500B transmits delay time information D3 indicating the calculated transmission delay time to the management device 400 via the cable monitoring devices 500A and 500D.
　このように、各ケーブル監視装置５００における通信部３３１が、電磁結合部３００経由で時刻情報を伝送する構成により、時刻情報を伝送するための信号線を別途設ける必要がないので、簡易な構成で同期処理を行うことができる。 Since the communication unit 331 in each cable monitoring device 500 transmits time information via the electromagnetic coupling unit 300 in this way, there is no need to separately provide a signal line for transmitting time information, so the configuration is simple. Synchronous processing can be performed.
　＜異常検出部＞
　図１１は、本開示の実施の形態に係るケーブル監視装置における異常検出部の構成の一例を示す図である。図１１を参照して、異常検出部２００は、ＨＰＦ（Ｈｉｇｈ　Ｐａｓｓ　Ｆｉｌｔｅｒ）２１０と、ＬＮＡ（Ｌｏｗ　Ｎｏｉｓｅ　Ａｍｐｌｉｆｉｅｒ）２２０と、ＡＤＣ（Ａｎａｌｏｇ　Ｄｉｇｉｔａｌ　Ｃｏｎｖｅｒｅｒ）２３０と、検波部２４０と、検波部２５０と、記憶部２７０と、判定部２８０とを含む。検波部２４０および検波部２５０は、たとえばＦＰＧＡ（Ｆｉｅｌｄ－Ｐｒｏｇｒａｍｍａｂｌｅ　Ｇａｔｅ　Ａｒｒａｙ）により構成される。判定部２８０は、たとえば、ＣＰＵ（Ｃｅｎｔｒａｌ　Ｐｒｏｃｅｓｓｉｎｇ　Ｕｎｉｔ）およびＤＳＰ（Ｄｉｇｉｔａｌ　Ｓｉｇｎａｌ　Ｐｒｏｃｅｓｓｏｒ）等のプロセッサにより実現される。記憶部２７０は、たとえば、不揮発性メモリであり、上記ＦＰＧＡに含まれる。 <Abnormality detector>
FIG. 11 is a diagram illustrating an example of a configuration of an abnormality detection unit in the cable monitoring device according to the embodiment of the present disclosure; Referring to FIG. 11 , abnormality detection unit 200 includes HPF (High Pass Filter) 210, LNA (Low Noise Amplifier) 220, ADC (Analog Digital Converter) 230, detection unit 240, detection unit 250, A storage unit 270 and a determination unit 280 are included. Detection section 240 and detection section 250 are configured by, for example, an FPGA (Field-Programmable Gate Array). Determining unit 280 is implemented by a processor such as a CPU (Central Processing Unit) and a DSP (Digital Signal Processor), for example. The storage unit 270 is, for example, a non-volatile memory and included in the FPGA.
　ＨＰＦ２１０は、信号出力部１２０，１２０Ａから受けた出力信号の周波数成分のうち、所定の周波数以下の成分を減衰させる。信号出力部１２０，１２０Ａから受けた出力信号には、地中ケーブル１０により伝送される電力の周波数に対応する５０Ｈｚまたは６０Ｈｚのノイズが多く含まれている。ＨＰＦ２１０は、たとえば６０Ｈｚ未満の周波数成分を減衰させることにより、信号出力部１２０，１２０Ａから受けた出力信号に含まれるノイズを除去する。 The HPF 210 attenuates the frequency components below a predetermined frequency among the frequency components of the output signals received from the signal output units 120 and 120A. The output signals received from the signal output units 120 and 120A contain much noise of 50 Hz or 60 Hz corresponding to the frequency of power transmitted through the underground cable 10. FIG. HPF 210 removes noise contained in the output signals received from signal output sections 120 and 120A, for example, by attenuating frequency components below 60 Hz.
　ＬＮＡ２２０は、ＨＰＦ２１０を通過した出力信号を増幅し、増幅した出力信号をＡＤＣ２３０へ出力する。 The LNA 220 amplifies the output signal that has passed through the HPF 210 and outputs the amplified output signal to the ADC 230.
　ＡＤＣ２３０は、ＬＮＡ２２０から受けた出力信号をデジタル信号に変換して検波部２４０および検波部２５０へ出力する。より詳細には、ＡＤＣ２３０は、ＬＮＡ２２０から受けた出力信号を、たとえば１００ＭＨｚのサンプリング周波数でサンプリングすることによりデジタル信号を生成し、生成したデジタル信号を検波部２４０および検波部２５０へ出力する。 The ADC 230 converts the output signal received from the LNA 220 into a digital signal and outputs the digital signal to the detectors 240 and 250 . More specifically, ADC 230 generates a digital signal by sampling the output signal received from LNA 220 at a sampling frequency of 100 MHz, for example, and outputs the generated digital signal to detection section 240 and detection section 250 .
　たとえば、異常検出部２００は、出力信号のレベルと所定のしきい値との比較結果に基づいて、絶縁破壊と部分放電とを判別する。 For example, the abnormality detection unit 200 distinguishes between dielectric breakdown and partial discharge based on the result of comparison between the level of the output signal and a predetermined threshold value.
　より詳細には、記憶部２７０は、ＡＤＣ２３０により生成されるデジタル信号の値に関する所定のしきい値として、しきい値ＴｈＡおよびしきい値ＴｈＢを記憶している。ここで、しきい値ＴｈＢは、しきい値ＴｈＡよりも大きいものとする。 More specifically, the storage unit 270 stores a threshold value ThA and a threshold value ThB as predetermined threshold values regarding the value of the digital signal generated by the ADC 230 . Here, the threshold ThB is assumed to be greater than the threshold ThA.
　検波部２４０は、ＡＤＣ２３０から受けたデジタル信号と、記憶部２７０におけるしきい値ＴｈＡ，ＴｈＢとを比較する比較処理を行う。より詳細には、検波部２４０は、ＡＤＣ２３０からのデジタル信号について１サンプルごとに比較処理を行う。すなわち、検波部２４０は、ＡＤＣ２３０におけるサンプリング周波数に対応する１０ナノ秒周期に従う比較タイミングにおいて比較処理を行う。 The detection unit 240 performs comparison processing for comparing the digital signal received from the ADC 230 and the thresholds ThA and ThB in the storage unit 270 . More specifically, the detector 240 performs comparison processing for each sample of the digital signal from the ADC 230 . That is, detection section 240 performs the comparison process at the comparison timing according to the 10-nanosecond period corresponding to the sampling frequency in ADC 230 .
　検波部２４０は、ＡＤＣ２３０から受けたデジタル信号の値が、しきい値ＴｈＡよりも大きく、かつしきい値ＴｈＢ未満である場合、カウンタ３３３の時刻情報を取得し、取得した時刻情報および当該デジタル信号の値を含む検波情報ｄａを記憶部２７０に保存する。また、検波部２４０は、比較タイミングにおいて比較処理を行った結果、ＡＤＣ２３０から受けたデジタル信号の値が、しきい値ＴｈＡよりも大きく、かつしきい値ＴｈＢ未満であった場合、当該比較タイミングから所定時間たとえば５マイクロ秒が経過するまで比較処理を一時停止し、当該所定時間経過後の比較タイミングにおいて比較処理を再開する。一方、検波部２４０は、ＡＤＣ２３０から受けたデジタル信号の値が、しきい値ＴｈＡ以下であるか、またはしきい値ＴｈＢ以上である場合、検波情報ｄａの生成および保存を行わない。 When the value of the digital signal received from ADC 230 is greater than threshold ThA and less than threshold ThB, detection section 240 acquires time information from counter 333 and compares the acquired time information and the digital signal. The detection information da including the value of is stored in the storage unit 270 . Further, if the value of the digital signal received from ADC 230 is greater than threshold ThA and less than threshold ThB as a result of performing comparison processing at the comparison timing, detection section 240 detects that from the comparison timing. The comparison process is suspended until a predetermined time period, for example, 5 microseconds, elapses, and the comparison process is restarted at the comparison timing after the elapse of the predetermined time period. On the other hand, when the value of the digital signal received from ADC 230 is equal to or less than threshold ThA or equal to or greater than threshold ThB, detection section 240 does not generate or store detection information da.
　検波部２５０は、ＡＤＣ２３０から受けたデジタル信号と、記憶部２７０におけるしきい値ＴｈＢとを比較する比較処理を行う。より詳細には、検波部２５０は、ＡＤＣ２３０からのデジタル信号について１サンプルごとに比較処理を行う。すなわち、検波部２５０は、上記比較タイミングにおいて比較処理を行う。検波部２５０は、ＡＤＣ２３０から受けたデジタル信号の値がしきい値ＴｈＢよりも大きい場合、カウンタ３３３の時刻情報を取得し、取得した時刻情報および当該デジタル信号の値を含む検波情報ｄｂを生成する。一方、検波部２５０は、ＡＤＣ２３０から受けたデジタル信号の値がしきい値ＴｈＢ以下である場合、検波情報ｄｂの生成を行わない。検波部２５０は、検波情報ｄｂの生成後、比較タイミングにおける比較処理を継続し、ＡＤＣ２３０から受けたデジタル信号の値がしきい値ＴｈＢ以下となるまで、しきい値ＴｈＢを超えたデジタル信号の数をカウントする。検波部２５０は、検波情報ｄｂの生成後、ＡＤＣ２３０から受けたデジタル信号の値がしきい値ＴｈＢ以下となった場合、生成した検波情報ｄｂに、カウントしたデジタル信号の数を示すカウント数を含めて当該検波情報ｄｂを記憶部２７０に保存する。 The detection unit 250 performs comparison processing for comparing the digital signal received from the ADC 230 and the threshold value ThB in the storage unit 270 . More specifically, the detector 250 performs comparison processing for each sample of the digital signal from the ADC 230 . That is, the detection section 250 performs comparison processing at the comparison timing. When the value of the digital signal received from ADC 230 is greater than threshold value ThB, detector 250 acquires the time information of counter 333 and generates detection information db including the acquired time information and the value of the digital signal. . On the other hand, when the value of the digital signal received from ADC 230 is equal to or less than threshold ThB, detection section 250 does not generate detection information db. After generating the detection information db, the detection unit 250 continues the comparison process at the comparison timing, and counts the number of digital signals exceeding the threshold ThB until the value of the digital signal received from the ADC 230 becomes equal to or less than the threshold ThB. to count. When the value of the digital signal received from the ADC 230 becomes equal to or less than the threshold value ThB after generation of the detection information db, the detection section 250 includes the count number indicating the number of counted digital signals in the generated detection information db. Then, the detection information db is stored in the storage unit 270 .
　判定部２８０は、検波部２４０，２５０により記憶部２７０に保存された検波情報ｄａ，ｄｂに基づいて判定処理を行う。 The determination unit 280 performs determination processing based on the detection information da and db stored in the storage unit 270 by the detection units 240 and 250 .
　より詳細には、判定部２８０は、検波情報ｄａが検波部２４０により記憶部２７０に保存された場合、地中ケーブル１０Ａにおいて部分放電が発生したと判定する。そして、判定部２８０は、記憶部２７０から当該検波情報ｄａおよび自己のケーブル監視装置５００のＩＤを取得し、取得した検波情報ｄａおよびＩＤを含む検出情報ＤＡを生成し、生成した検出情報ＤＡを通信部３３１へ出力する。通信部３３１は、判定部２８０から検出情報ＤＡを受けて、受けた検出情報ＤＡを電磁結合部３００経由で管理装置４００へ伝送する。 More specifically, when the detection information da is stored in the storage unit 270 by the detection unit 240, the determination unit 280 determines that partial discharge has occurred in the underground cable 10A. Then, the determination unit 280 acquires the detection information da and the ID of its own cable monitoring device 500 from the storage unit 270, generates detection information DA including the acquired detection information da and the ID, and stores the generated detection information DA. Output to the communication unit 331 . The communication unit 331 receives the detection information DA from the determination unit 280 and transmits the received detection information DA to the management device 400 via the electromagnetic coupling unit 300 .
　また、判定部２８０は、検波情報ｄｂが検波部２４０により記憶部２７０に保存された場合、当該検波情報ｄｂに含まれるカウント数に基づいて、地中ケーブル１０Ａにおいて絶縁破壊が発生したか否かを判定する。より詳細には、判定部２８０は、検波情報ｄｂに含まれるカウント数が所定数たとえば５００００００以上である場合、すなわち検波部２５０による比較処理において５０ミリ秒（５００００００回×１０ナノ秒周期）以上の期間において連続してデジタル信号の値がしきい値ＴｈＢよりも大きい場合、地中ケーブル１０Ａにおいて絶縁破壊が発生したと判定する。そして、判定部２８０は、記憶部２７０から当該複数の検波情報ｄｂおよび自己のケーブル監視装置５００のＩＤを取得し、取得した各検波情報ｄｂおよびＩＤを含む検出情報ＤＢを生成し、生成した検出情報ＤＢを通信部３３１へ出力する。通信部３３１は、判定部２８０から検出情報ＤＢを受けて、受けた検出情報ＤＢを電磁結合部３００経由で管理装置４００へ伝送する。一方、判定部２８０は、検波情報ｄｂに含まれるカウント数が上記所定数未満である場合、検出情報ＤＢの生成を行わない。 Further, when the detection information db is stored in the storage unit 270 by the detection unit 240, the determination unit 280 determines whether or not dielectric breakdown has occurred in the underground cable 10A based on the count number included in the detection information db. judge. More specifically, when the number of counts included in the detection information db is a predetermined number, for example, 5,000,000 or more, the determination unit 280 determines that the comparison processing by the detection unit 250 is 50 milliseconds (5,000,000 times×10 nanosecond cycle) or more. If the value of the digital signal is continuously greater than the threshold value ThB during the period, it is determined that insulation breakdown has occurred in the underground cable 10A. Then, the determination unit 280 acquires the plurality of detection information db and the ID of its own cable monitoring device 500 from the storage unit 270, generates the detection information DB including the acquired detection information db and the ID, and generates the detection information DB. It outputs the information DB to the communication unit 331 . The communication unit 331 receives the detection information DB from the determination unit 280 and transmits the received detection information DB to the management device 400 via the electromagnetic coupling unit 300 . On the other hand, when the count number included in the detection information db is less than the predetermined number, the determination section 280 does not generate the detection information DB.
　このように、各ケーブル監視装置５００における通信部３３１が、電磁結合部３００経由で検出情報ＤＡ，ＤＢを管理装置４００へ伝送する構成により、検出情報ＤＡ，ＤＢを管理装置４００へ伝送するための信号線を別途設ける必要がないので、簡易な構成で検出情報ＤＡ，ＤＢを管理装置４００へ伝送することができる。 In this manner, the communication unit 331 in each cable monitoring device 500 transmits the detection information DA, DB to the management device 400 via the electromagnetic coupling unit 300. Since there is no need to separately provide a signal line, the detection information DA, DB can be transmitted to the management device 400 with a simple configuration.
　ここで、地中ケーブル１０Ａにおいて絶縁破壊が発生したときに信号検出部１００から出力される出力信号のレベルは、地中ケーブル１０Ａにおいて部分放電が発生したときに信号検出部１００から出力される出力信号のレベルよりも大きい。本実施の形態に係るケーブル監視装置５００では、異常検出部２００が、出力信号のレベルすなわちＡＤＣ２３０により生成されたデジタル信号の値としきい値ＴｈＢとの比較結果に基づいて絶縁破壊と部分放電とを判別する構成により、簡易な構成および処理により絶縁破壊と部分放電とを判別することができる。 Here, the level of the output signal output from the signal detection unit 100 when insulation breakdown occurs in the underground cable 10A is the level of the output signal output from the signal detection unit 100 when partial discharge occurs in the underground cable 10A. Greater than the signal level. In cable monitoring apparatus 500 according to the present embodiment, abnormality detection section 200 detects dielectric breakdown and partial discharge based on the result of comparison between the level of the output signal, that is, the value of the digital signal generated by ADC 230 and threshold value ThB. With the configuration for discrimination, it is possible to discriminate between dielectric breakdown and partial discharge with a simple configuration and processing.
　また、地中ケーブル１０Ａにおいて絶縁破壊が発生したときに信号検出部１００から出力される出力信号において当該絶縁破壊に起因する変化が継続する期間は、地中ケーブル１０Ａにおいて当該部分放電が発生したときに信号検出部１００から出力される出力信号において部分放電に起因する変化が継続する期間よりも長い。本実施の形態に係るケーブル監視装置５００では、異常検出部２００における判定部２８０が、記憶部２７０に保存された検波情報ｄｂに含まれるカウント数が所定数以上である場合に地中ケーブル１０Ａにおいて絶縁破壊が発生したと判定する構成により、地中ケーブル１０Ａにおける絶縁破壊を開閉サージと区別して検出することができる。すなわち、判定部２８０は、出力信号のレベルが所定値以上の状態が所定期間継続した場合、地中ケーブル１０Ａにおいて絶縁破壊が発生したと判定する一方で、出力信号のレベルが所定値以上の状態が所定期間継続しない場合、地中ケーブル１０Ａにおいて開閉サージが発生したと判定する。 Further, the period during which the change due to the dielectric breakdown continues in the output signal output from the signal detection unit 100 when the dielectric breakdown occurs in the underground cable 10A is is longer than the period during which the change caused by the partial discharge continues in the output signal output from the signal detection unit 100 . In cable monitoring device 500 according to the present embodiment, determination unit 280 in abnormality detection unit 200 determines that in underground cable 10A when the count number included in detection information db stored in storage unit 270 is equal to or greater than a predetermined number. With the configuration for determining that a dielectric breakdown has occurred, the dielectric breakdown in the underground cable 10A can be detected separately from switching surges. That is, when the level of the output signal is equal to or higher than the predetermined value for a predetermined period of time, the determination unit 280 determines that insulation breakdown has occurred in the underground cable 10A. does not continue for a predetermined period of time, it is determined that a switching surge has occurred in the underground cable 10A.
　［管理装置］
　図１２は、本開示の実施の形態に係る管理装置の構成を示す図である。図１２を参照して、管理装置４００は、取得部４２０と、部分放電算出部４３０と、絶縁破壊算出部４４０と、記憶部４５０とを備える。部分放電算出部４３０は、第１算出部の一例である。絶縁破壊算出部４４０は、第２算出部の一例である。取得部４２０、部分放電算出部４３０および絶縁破壊算出部４４０は、たとえば、ＣＰＵおよびＤＳＰ等のプロセッサにより実現される。記憶部４５０は、たとえば不揮発性メモリである。 [Management device]
FIG. 12 is a diagram illustrating a configuration of a management device according to an embodiment of the present disclosure; Referring to FIG. 12 , management device 400 includes acquisition unit 420 , partial discharge calculation unit 430 , dielectric breakdown calculation unit 440 and storage unit 450 . The partial discharge calculator 430 is an example of a first calculator. The dielectric breakdown calculator 440 is an example of a second calculator. Acquisition unit 420, partial discharge calculation unit 430, and dielectric breakdown calculation unit 440 are realized by a processor such as a CPU and a DSP, for example. Storage unit 450 is, for example, a non-volatile memory.
　取得部４２０は、複数のケーブル監視装置５００が地中ケーブル１０Ａにおける部分放電を検出した時刻をそれぞれ示す複数の検出情報ＤＡと、複数のケーブル監視装置５００が地中ケーブル１０Ａにおける絶縁破壊を検出した時刻をそれぞれ示す複数の検出情報ＤＢとを取得する。 The acquisition unit 420 obtains a plurality of pieces of detection information DA each indicating the time when the plurality of cable monitoring devices 500 detected partial discharge in the underground cable 10A, and the plurality of cable monitoring devices 500 detecting a dielectric breakdown in the underground cable 10A. A plurality of detection information DBs each indicating the time are acquired.
　より詳細には、取得部４２０は、上述の通信線を介してケーブル監視装置５００Ｄにおける通信部３３１と接続されている。取得部４２０は、複数のケーブル監視装置５００の検出情報ＤＡを通信線経由でケーブル監視装置５００Ｄからそれぞれ受信する。取得部４２０は、検出情報ＤＡを受信すると、受信した検出情報ＤＡを記憶部４５０に保存する。また、取得部４２０は、複数のケーブル監視装置５００の検出情報ＤＢを通信線経由でケーブル監視装置５００Ｄからそれぞれ受信する。取得部４２０は、検出情報ＤＢを受信すると、受信した検出情報ＤＢを記憶部４５０に保存する。 More specifically, the acquisition unit 420 is connected to the communication unit 331 in the cable monitoring device 500D via the communication line described above. Acquisition unit 420 receives detection information DA of a plurality of cable monitoring devices 500 from cable monitoring devices 500D via communication lines. Upon receiving the detection information DA, the acquisition unit 420 stores the received detection information DA in the storage unit 450 . In addition, the acquisition unit 420 receives detection information DBs of a plurality of cable monitoring devices 500 from the cable monitoring devices 500D via communication lines. Upon receiving the detection information DB, the acquisition unit 420 stores the received detection information DB in the storage unit 450 .
　また、取得部４２０は、ケーブル監視装置５００間の伝送遅延時間を示す遅延時間情報を取得する。より詳細には、取得部４２０は、遅延時間情報Ｄ１，Ｄ２，Ｄ３を通信線経由でケーブル監視装置５００Ｄから受信する。取得部４２０は、遅延時間情報Ｄ１，Ｄ２，Ｄ３を受信すると、受信した遅延時間情報Ｄ１，Ｄ２，Ｄ３を記憶部４５０に保存する。 In addition, the acquisition unit 420 acquires delay time information indicating the transmission delay time between the cable monitoring devices 500 . More specifically, the acquisition unit 420 receives the delay time information D1, D2, D3 from the cable monitoring device 500D via the communication line. Upon receiving the delay time information D1, D2 and D3, the acquisition unit 420 stores the received delay time information D1, D2 and D3 in the storage unit 450 .
　部分放電算出部４３０は、取得部４２０により受信された各検出情報ＤＡに基づいて、地中ケーブル１０Ａにおける部分放電の発生位置を算出する。また、絶縁破壊算出部４４０は、取得部４２０により受信された各検出情報ＤＢに基づいて、地中ケーブル１０Ａにおける絶縁破壊の発生位置を算出する。 The partial discharge calculator 430 calculates the position where the partial discharge occurs in the underground cable 10A based on each piece of detection information DA received by the acquirer 420 . Further, the dielectric breakdown calculation unit 440 calculates the occurrence position of the dielectric breakdown in the underground cable 10A based on each detection information DB received by the acquisition unit 420 .
　図１３は、本開示の実施の形態に係る送電システムにおける部分放電の発生位置の一例を示す図である。図１３を参照して、地中ケーブル１０Ａにおいて部分放電が発生した場合、当該部分放電の発生により地中ケーブル１０Ａを通して流れる電流は、絶縁接続部４２Ｂおよび絶縁接続部４２Ｃの方向へそれぞれ伝搬する。 FIG. 13 is a diagram showing an example of positions where partial discharges occur in the power transmission system according to the embodiment of the present disclosure. Referring to FIG. 13, when partial discharge occurs in underground cable 10A, the current flowing through underground cable 10A due to the occurrence of the partial discharge propagates toward insulated connection portion 42B and insulated connection portion 42C.
　たとえば、地中ケーブル１０Ａにおける、ケーブル監視装置５００Ｂの監視位置である絶縁接続部４２Ｂと、ケーブル監視装置５００Ｃの監視位置である絶縁接続部４２Ｃとの中間地点Ｐ１において部分放電が発生した場合、当該部分放電は、ケーブル監視装置５００Ｂ，５００Ｃにおいて同時刻に検出される。一方、たとえば、地中ケーブル１０Ａにおける中間地点Ｐ１よりも絶縁接続部４２Ｂ側の地点Ｐ２において部分放電が発生した場合、当該部分放電は、ケーブル監視装置５００Ｃよりも先にケーブル監視装置５００Ｂにおいて検出される。したがって、部分放電算出部４３０は、２つのケーブル監視装置５００における部分放電の検出時刻等に基づいて、部分放電の発生位置を標定することができる。絶縁破壊算出部４４０も同様に、２つのケーブル監視装置５００における絶縁破壊の検出時刻等に基づいて、絶縁破壊の発生位置を標定することができる。 For example, in the underground cable 10A, when a partial discharge occurs at an intermediate point P1 between the insulated connection portion 42B, which is the monitoring position of the cable monitoring device 500B, and the insulated connection portion 42C, which is the monitoring position of the cable monitoring device 500C, Partial discharge is detected at the same time by cable monitoring devices 500B and 500C. On the other hand, for example, when a partial discharge occurs at a point P2 closer to the insulating connection portion 42B than the intermediate point P1 in the underground cable 10A, the partial discharge is detected by the cable monitoring device 500B before the cable monitoring device 500C. be. Therefore, the partial discharge calculator 430 can locate the partial discharge generation position based on the partial discharge detection times of the two cable monitoring devices 500 . Similarly, the dielectric breakdown calculation unit 440 can locate the occurrence position of the dielectric breakdown based on the detection time of the dielectric breakdown in the two cable monitoring devices 500 and the like.
　より詳細には、記憶部４５０は、地中ケーブル１０Ａにおける各ケーブル監視装置５００の監視位置の間の距離を示す距離情報、および地中ケーブル１０Ａにおける電流の伝搬速度を示す速度情報を記憶している。地中ケーブル１０Ａは、たとえば、ＣＶ（Ｃｒｏｓｓ-ｌｉｎｋｅｄ　ｐｏｌｙｅｔｈｙｌｅｎｅ　ｉｎｓｕｌａｔｅｄ　Ｖｉｎｙｌ　ｓｈｅａｔｈ）ケーブルまたはＯＦ（Ｏｉｌ－Ｆｉｌｌｅｄ）ケーブルである。ＣＶケーブルにおける電流の伝搬速度は、たとえば１７２ｍ／μｓであり、ＯＦケーブルにおける電流の伝搬速度は、たとえば１５８ｍ／μｓである。 More specifically, storage unit 450 stores distance information indicating the distance between monitoring positions of cable monitoring devices 500 in underground cable 10A and velocity information indicating the propagation velocity of current in underground cable 10A. there is The underground cable 10A is, for example, a CV (Cross-linked polyethylene insulated vinyl sheath) cable or an OF (Oil-Filled) cable. The current propagation velocity in the CV cable is, for example, 172 m/μs, and the current propagation velocity in the OF cable is, for example, 158 m/μs.
　部分放電算出部４３０は、記憶部４５０に保存された検出情報ＤＡが示す検出時刻を、当該検出情報ＤＡの伝送経路に応じて遅延時間情報Ｄ１，Ｄ２，Ｄ３の一部または全部を用いて補正する。より詳細には、部分放電算出部４３０は、ケーブル監視装置５００ＡのＩＤを含む検出情報ＤＡが示す検出時刻を、遅延時間情報Ｄ１を用いて補正し、ケーブル監視装置５００ＢのＩＤを含む検出情報ＤＡが示す検出時刻を、遅延時間情報Ｄ１，Ｄ２を用いて補正し、ケーブル監視装置５００ＣのＩＤを含む検出情報ＤＡが示す検出時刻を、遅延時間情報Ｄ１，Ｄ２，Ｄ３を用いて補正する。たとえば、部分放電算出部４３０は、ケーブル監視装置５００ＡのＩＤを含む検出情報ＤＡが示す検出時刻に遅延時間情報Ｄ１が示す伝送遅延時間を加えることにより当該検出時刻を補正する。また、たとえば、部分放電算出部４３０は、ケーブル監視装置５００ＢのＩＤを含む検出情報ＤＡが示す検出時刻に遅延時間情報Ｄ１，Ｄ２が示す各伝送遅延時間を加えることにより当該検出時刻を補正する。また、たとえば、部分放電算出部４３０は、ケーブル監視装置５００ＣのＩＤを含む検出情報ＤＡが示す検出時刻に遅延時間情報Ｄ１，Ｄ２，Ｄ３が示す各伝送遅延時間を加えることにより当該検出時刻を補正する。以下、検出情報ＤＡが示す検出時刻とは、補正後の検出時刻を言うものとする。同様に、絶縁破壊算出部４４０は、記憶部４５０に保存された検出情報ＤＢが示す検出時刻を、当該検出情報ＤＢの伝送経路に応じて遅延時間情報Ｄ１，Ｄ２，Ｄ３の一部または全部を用いて補正する。以下、検出情報ＤＢが示す検出時刻とは、補正後の検出時刻を言うものとする。 The partial discharge calculation unit 430 corrects the detection time indicated by the detection information DA stored in the storage unit 450 using part or all of the delay time information D1, D2, and D3 according to the transmission path of the detection information DA. do. More specifically, the partial discharge calculator 430 corrects the detection time indicated by the detection information DA including the ID of the cable monitoring device 500A using the delay time information D1, and corrects the detection time indicated by the detection information DA including the ID of the cable monitoring device 500B. is corrected using the delay time information D1 and D2, and the detection time indicated by the detection information DA including the ID of the cable monitoring device 500C is corrected using the delay time information D1, D2 and D3. For example, partial discharge calculator 430 corrects the detection time by adding the transmission delay time indicated by delay time information D1 to the detection time indicated by detection information DA including the ID of cable monitoring device 500A. Further, for example, the partial discharge calculator 430 corrects the detection time by adding each transmission delay time indicated by the delay time information D1 and D2 to the detection time indicated by the detection information DA including the ID of the cable monitoring device 500B. Further, for example, the partial discharge calculator 430 corrects the detection time by adding each transmission delay time indicated by the delay time information D1, D2, and D3 to the detection time indicated by the detection information DA including the ID of the cable monitoring device 500C. do. Hereinafter, the detection time indicated by the detection information DA means the detection time after correction. Similarly, the dielectric breakdown calculator 440 converts the detection time indicated by the detection information DB stored in the storage unit 450 into part or all of the delay time information D1, D2, and D3 according to the transmission path of the detection information DB. corrected using Hereinafter, the detection time indicated by the detection information DB refers to the detection time after correction.
　部分放電算出部４３０は、記憶部４５０に保存された、異なるＩＤを含む同一の部分放電に関する複数の検出情報ＤＡが示す検出時刻のうちの、最も早い２つの検出時刻の時間差を算出する。そして、部分放電算出部４３０は、算出した時間差と、記憶部４５０における距離情報および速度情報とに基づいて、地中ケーブル１０Ａにおける部分放電の発生位置を算出する。一例として、部分放電算出部４３０は、上記時間差として、ケーブル監視装置５００ＡのＩＤを含む検出情報ＤＡが示す検出時刻と、ケーブル監視装置５００ＢのＩＤを含む検出情報ＤＡが示す検出時刻との時間差を「０．２６μｓ」と算出する。ここで、ケーブル監視装置５００ＡのＩＤを含む検出情報ＤＡが示す検出時刻は、ケーブル監視装置５００ＢのＩＤを含む検出情報ＤＡが示す検出時刻よりも早い時刻であるものとする。また、記憶部４５０における距離情報が示す、ケーブル監視装置５００Ａの監視位置とケーブル監視装置５００Ｂの監視位置との間の距離は「３００ｍ」であるとする。また、記憶部４５０における速度情報が示す伝搬速度は「１７２ｍ／μｓ」であるとする。この場合、部分放電算出部４３０は、地中ケーブル１０Ａにおける部分放電の発生位置を、ケーブル監視装置５００Ａの監視位置とケーブル監視装置５００Ｂの監視位置との中間地点からケーブル監視装置５００Ａ側に２２．３６ｍ（（０．２６μｓ）×（１７２ｍ／μｓ）／２）寄った地点、すなわちケーブル監視装置５００Ａの監視位置からケーブル監視装置５００Ｂ側に１２７．６４ｍ（１５０ｍ－２２．３６ｍ）寄った地点であると算出する。 The partial discharge calculation unit 430 calculates the time difference between the two earliest detection times among the detection times indicated by the plurality of pieces of detection information DA related to the same partial discharge with different IDs stored in the storage unit 450 . Based on the calculated time difference and the distance information and speed information in the storage unit 450, the partial discharge calculator 430 calculates the position where the partial discharge occurs in the underground cable 10A. As an example, the partial discharge calculator 430 calculates, as the time difference, the time difference between the detection time indicated by the detection information DA including the ID of the cable monitoring device 500A and the detection time indicated by the detection information DA including the ID of the cable monitoring device 500B. It is calculated as "0.26 μs". Here, it is assumed that the detection time indicated by the detection information DA including the ID of the cable monitoring device 500A is earlier than the detection time indicated by the detection information DA including the ID of the cable monitoring device 500B. It is also assumed that the distance between the monitoring position of cable monitoring device 500A and the monitoring position of cable monitoring device 500B indicated by the distance information in storage unit 450 is "300 m". It is also assumed that the propagation velocity indicated by the velocity information in storage unit 450 is "172 m/μs". In this case, the partial discharge calculator 430 calculates the position of occurrence of the partial discharge in the underground cable 10A by 22.22 from the intermediate point between the monitoring position of the cable monitoring device 500A and the monitoring position of the cable monitoring device 500B to the cable monitoring device 500A side. 36 m ((0.26 μs)×(172 m/μs)/2), that is, a point 127.64 m (150 m−22.36 m) closer to the cable monitoring device 500B side from the monitoring position of the cable monitoring device 500A. to calculate.
　また、絶縁破壊算出部４４０は、記憶部４５０に保存された、異なるＩＤを含む同一の部分放電に関する複数の検出情報ＤＢが示す検出時刻のうちの、最も早い２つの検出時刻の時間差を算出する。そして、絶縁破壊算出部４４０は、算出した時間差と、記憶部４５０における距離情報および速度情報とに基づいて、地中ケーブル１０Ａにおける絶縁破壊の発生位置を算出する。 Further, the dielectric breakdown calculation unit 440 calculates the time difference between the two earliest detection times among the detection times indicated by the plurality of detection information DBs regarding the same partial discharge including different IDs stored in the storage unit 450. . Based on the calculated time difference and the distance information and speed information in the storage unit 450, the dielectric breakdown calculation unit 440 calculates the location where the dielectric breakdown occurs in the underground cable 10A.
　たとえば、部分放電算出部４３０および絶縁破壊算出部４４０は、算出した発生位置をケーブル監視システム５０１の管理者へ通知する処理を行う。 For example, the partial discharge calculation unit 430 and the dielectric breakdown calculation unit 440 perform processing for notifying the administrator of the cable monitoring system 501 of the calculated occurrence position.
　ここで、再び図１および図６を参照して、たとえば、地上接続部４３Ｂに対応するケーブル監視装置５００が設けられていない場合、絶縁接続部４２Ｃと地上接続部４３Ｂとの間の区間において地中ケーブル１０Ａにおける部分放電が発生した場合、部分放電の正確な発生位置を算出することは困難である。具体的には、絶縁接続部４２Ｃと地上接続部４３Ｂとの間の区間において地中ケーブル１０Ａにおける部分放電が発生した場合、当該部分放電に関する複数の検出時刻のうちの最も早い２つの検出時刻は、ケーブル監視装置５００Ｂからの検出情報ＤＡが示す検出時刻、およびケーブル監視装置５００Ｃからの検出情報ＤＡが示す検出時刻である。しかしながら、部分放電算出部４３０は、当該２つの検出時刻の時間差からは、絶縁接続部４２Ｃと地上接続部４３Ｂとの間の区間のどの位置において部分放電が発生したのかを判断することができない。絶縁破壊の発生位置についても同様である。このような問題を解決するために、ケーブル監視装置５００は、地中ケーブル１０のケーブル区間にくまなく設置されることが好ましい。具体的には、ケーブル監視システム５０１は、図１に示す地上接続部４３Ｂに対応して設けられたケーブル監視装置５００を備えることが好ましい。これにより、管理装置４００において、すべてのケーブル区間において部分放電および絶縁破壊の発生位置の算出が可能となる。 Here, referring to FIGS. 1 and 6 again, for example, if the cable monitoring device 500 corresponding to the ground connection portion 43B is not provided, the ground connection portion 42C and the ground connection portion 43B are separated from each other. When partial discharge occurs in the medium cable 10A, it is difficult to calculate the exact position of occurrence of the partial discharge. Specifically, when a partial discharge occurs in the underground cable 10A in the section between the insulated connection portion 42C and the ground connection portion 43B, the earliest two detection times among the plurality of detection times regarding the partial discharge are , the detection time indicated by the detection information DA from the cable monitoring device 500B, and the detection time indicated by the detection information DA from the cable monitoring device 500C. However, from the time difference between the two detection times, the partial discharge calculator 430 cannot determine at which position in the section between the insulated connection portion 42C and the ground connection portion 43B the partial discharge has occurred. The same applies to the location where dielectric breakdown occurs. In order to solve such problems, the cable monitoring device 500 is preferably installed throughout the cable section of the underground cable 10 . Specifically, the cable monitoring system 501 preferably includes a cable monitoring device 500 provided corresponding to the ground connection section 43B shown in FIG. This enables the management device 400 to calculate the positions where partial discharge and dielectric breakdown occur in all cable sections.
　［変形例］
　図１４は、本開示の実施の形態の変形例に係る異常検出部の構成を示す図である。図１４を参照して、異常検出部２０１は、異常検出部２００と比べて、ＬＮＡ２２１と、ＡＤＣ２３１とをさらに含む。ケーブル監視装置５００は、異常検出部２００の代わりに異常検出部２０１を備える構成であってもよい。 [Modification]
FIG. 14 is a diagram illustrating a configuration of an abnormality detection unit according to a modification of the embodiment of the present disclosure; Referring to FIG. 14 , abnormality detection unit 201 further includes LNA 221 and ADC 231 as compared with abnormality detection unit 200 . Cable monitoring device 500 may be configured to include abnormality detection section 201 instead of abnormality detection section 200 .
　ＡＤＣ２３０は、ＬＮＡ２２０から受けた出力信号をデジタル信号に変換して検波部２４０へ出力する。すなわち、ＡＤＣ２３０は、ＨＰＦ２１０を通過した出力信号をデジタル信号に変換して検波部２４０へ出力する。 The ADC 230 converts the output signal received from the LNA 220 into a digital signal and outputs the digital signal to the detection section 240 . That is, ADC 230 converts the output signal that has passed through HPF 210 into a digital signal and outputs the digital signal to detection section 240 .
　ＬＮＡ２２１は、信号出力部１２０，１２０Ａから受けた出力信号を増幅し、増幅した出力信号をＡＤＣ２３１へ出力する。 The LNA 221 amplifies the output signals received from the signal output units 120 and 120A and outputs the amplified output signals to the ADC 231.
　ＡＤＣ２３１は、ＬＮＡ２２１から受けた出力信号をデジタル信号に変換して検波部２５０へ出力する。すなわち、ＡＤＣ２３０は、ＨＰＦ２１０を通過していない出力信号をデジタル信号に変換して検波部２５０へ出力する。より詳細には、ＡＤＣ２３１は、ＬＮＡ２２１から受けた出力信号を、たとえば１００ＭＨｚのサンプリング周波数でサンプリングすることによりデジタル信号を生成し、生成したデジタル信号を検波部２５０へ出力する。 The ADC 231 converts the output signal received from the LNA 221 into a digital signal and outputs it to the detection section 250 . That is, ADC 230 converts an output signal that has not passed through HPF 210 into a digital signal and outputs the digital signal to detection section 250 . More specifically, ADC 231 generates a digital signal by sampling the output signal received from LNA 221 at a sampling frequency of 100 MHz, for example, and outputs the generated digital signal to detection section 250 .
　たとえば、異常検出部２０１は、ＨＰＦ２１０を通過した出力信号に基づいて部分放電を検出し、ＨＰＦ２１０を通過する前の出力信号に基づいて絶縁破壊を検出する。 For example, the abnormality detection unit 201 detects partial discharge based on the output signal that has passed through the HPF 210 and detects dielectric breakdown based on the output signal that has not yet passed through the HPF 210 .
　検波部２４０は、ＡＤＣ２３０から受けたデジタル信号と、記憶部２７０におけるしきい値ＴｈＡとを比較する比較処理を行い、比較結果に応じて検波情報ｄａを記憶部２７０に保存する。 The detection unit 240 performs comparison processing for comparing the digital signal received from the ADC 230 and the threshold value ThA in the storage unit 270, and stores detection information da in the storage unit 270 according to the comparison result.
　検波部２５０は、ＡＤＣ２３１から受けたデジタル信号と、記憶部２７０におけるしきい値ＴｈＢとを比較する比較処理を行い、比較結果に応じて検波情報ｄｂを記憶部２７０に保存する。 The detection unit 250 performs comparison processing for comparing the digital signal received from the ADC 231 and the threshold value ThB in the storage unit 270, and stores detection information db in the storage unit 270 according to the comparison result.
　判定部２８０は、検波情報ｄａが検波部２４０により記憶部２７０に保存された場合、地中ケーブル１０Ａにおいて部分放電が発生したと判定する。そして、判定部２８０は、記憶部２７０から当該検波情報ｄａおよび自己のケーブル監視装置５００のＩＤを取得し、取得した検波情報ｄａおよびＩＤを含む検出情報ＤＡを生成し、生成した検出情報ＤＡを通信部３３１へ出力する。 When the detection information da is stored in the storage unit 270 by the detection unit 240, the determination unit 280 determines that partial discharge has occurred in the underground cable 10A. Then, the determination unit 280 acquires the detection information da and the ID of its own cable monitoring device 500 from the storage unit 270, generates detection information DA including the acquired detection information da and the ID, and stores the generated detection information DA. Output to the communication unit 331 .
　また、判定部２８０は、連続する複数の比較タイミングＣＴＢに対応する複数の検波情報ｄｂが検波部２４０により記憶部２７０に保存された場合、地中ケーブル１０Ａにおいて絶縁破壊が発生したと判定する。そして、判定部２８０は、記憶部２７０から当該複数の検波情報ｄｂおよび自己のケーブル監視装置５００のＩＤを取得し、取得した各検波情報ｄｂおよびＩＤを含む検出情報ＤＢを生成し、生成した検出情報ＤＢを通信部３３１へ出力する。 Further, the determination unit 280 determines that a dielectric breakdown has occurred in the underground cable 10A when a plurality of pieces of detection information db corresponding to a plurality of consecutive comparison timings CTB are stored in the storage unit 270 by the detection unit 240. Then, the determination unit 280 acquires the plurality of detection information db and the ID of its own cable monitoring device 500 from the storage unit 270, generates the detection information DB including the acquired detection information db and the ID, and generates the detection information DB. It outputs the information DB to the communication unit 331 .
　ここで、地中ケーブル１０Ａにおいて絶縁破壊が発生したときに信号検出部１００から出力される出力信号は、低い周波数成分を含む信号である。本変形例に係る異常検出部２０１のように、ＨＰＦ２１０を通過する前の出力信号に基づいて絶縁破壊を検出する構成により、より正確に絶縁破壊を検出することができる。 Here, the output signal output from the signal detection unit 100 when dielectric breakdown occurs in the underground cable 10A is a signal containing low frequency components. Like the abnormality detection unit 201 according to the present modification, the configuration for detecting dielectric breakdown based on the output signal before passing through the HPF 210 can detect dielectric breakdown more accurately.
　図１５は、本開示の実施の形態の変形例に係る異常検出部の構成を示す図である。図１５を参照して、異常検出部２０２は、異常検出部２００と比べて、検波部２４０および検波部２５０の代わりに保存処理部２９０を含み、判定部２８０の代わりに判定部２８１を含む。ケーブル監視装置５００は、異常検出部２００の代わりに異常検出部２０２を備える構成であってもよい。 FIG. 15 is a diagram showing the configuration of an abnormality detection unit according to a modification of the embodiment of the present disclosure. Referring to FIG. 15 , abnormality detection unit 202 includes storage processing unit 290 instead of detection units 240 and 250 , and determination unit 281 instead of determination unit 280 , as compared with abnormality detection unit 200 . The cable monitoring device 500 may be configured to include an abnormality detection section 202 instead of the abnormality detection section 200 .
　たとえば、異常検出部２０２は、出力信号の波形に基づいて、絶縁破壊と部分放電とを判別する。 For example, the abnormality detection unit 202 distinguishes between dielectric breakdown and partial discharge based on the waveform of the output signal.
　図１６および図１７は、本開示の実施の形態に係るケーブル監視装置におけるＡＤＣが受ける出力信号の一例を示す図である。図１６は、地中ケーブル１０Ａにおいて部分放電が発生したときにケーブル監視装置５００におけるＬＮＡ２２０から出力される出力信号を示す。図１７は、地中ケーブル１０Ａにおいて絶縁破壊が発生したときにケーブル監視装置５００におけるＬＮＡ２２０から出力される出力信号を示す。 16 and 17 are diagrams showing examples of output signals received by the ADC in the cable monitoring device according to the embodiment of the present disclosure. FIG. 16 shows an output signal output from LNA 220 in cable monitoring device 500 when partial discharge occurs in underground cable 10A. FIG. 17 shows an output signal output from LNA 220 in cable monitoring device 500 when dielectric breakdown occurs in underground cable 10A.
　図１６を参照して、地中ケーブル１０Ａにおいて部分放電が発生したときにＬＮＡ２２０から出力される出力信号の波形は、たとえば１マイクロ秒未満の期間において振動する振動波形である。図１７を参照して、地中ケーブル１０Ａにおいて絶縁破壊が発生したときにＬＮＡ２２０から出力される出力信号は、たとえば１マイクロ秒以上の期間にわたって飽和した値をとる。これは、ＬＮＡ２２０の前段に配置された図示しない保護回路により、所定値以下の値となるように整形された出力信号がＬＮＡ２２０に入力されるからである。 Referring to FIG. 16, the waveform of the output signal output from LNA 220 when partial discharge occurs in underground cable 10A is, for example, an oscillating waveform that oscillates in a period of less than 1 microsecond. Referring to FIG. 17, the output signal output from LNA 220 when insulation breakdown occurs in underground cable 10A takes a saturated value over a period of 1 microsecond or longer, for example. This is because the LNA 220 is supplied with an output signal that has been shaped to have a value equal to or less than a predetermined value by a protection circuit (not shown) arranged in the preceding stage of the LNA 220 .
　記憶部２７０は、地中ケーブル１０Ａにおいて部分放電が発生したときにＡＤＣ２３０により生成される所定時間分のＫ個のサンプルからなるデジタル信号ＳＡと、地中ケーブル１０Ａにおいて絶縁破壊が発生したときにＡＤＣ２３０により生成される所定時間分のＫ個のサンプルからなるデジタル信号ＳＢとを記憶している。ここで、Ｋは２以上の整数である。デジタル信号ＳＡは、地中ケーブル１０Ａにおいて部分放電が発生したときにＬＮＡ２２０から出力される出力信号の波形に対応し、デジタル信号ＳＢは、地中ケーブル１０Ａにおいて絶縁破壊が発生したときにＬＮＡ２２０から出力される出力信号の波形に対応する。 Storage unit 270 stores digital signal SA composed of K samples for a predetermined time generated by ADC 230 when partial discharge occurs in underground cable 10A, and ADC 230 when dielectric breakdown occurs in underground cable 10A. and a digital signal SB consisting of K samples for a predetermined time period generated by . Here, K is an integer of 2 or more. The digital signal SA corresponds to the waveform of the output signal output from the LNA 220 when partial discharge occurs in the underground cable 10A, and the digital signal SB is output from the LNA 220 when dielectric breakdown occurs in the underground cable 10A. corresponds to the waveform of the output signal to be
　保存処理部２９０は、ＡＤＣ２３０からデジタル信号を受けて、カウンタ３３３の時刻情報を取得する。保存処理部２９０は、ＡＤＣ２３０から受けたデジタル信号に時刻情報を示すタイムスタンプを付与し、タイムスタンプが付与されたデジタル信号を記憶部２７０に保存する処理を行う。記憶部２７０は、たとえばリングバッファにより構成され、古いデジタル信号から上書きされる。 The storage processing unit 290 receives the digital signal from the ADC 230 and acquires the time information of the counter 333 . The storage processing unit 290 adds a time stamp indicating time information to the digital signal received from the ADC 230 and stores the time-stamped digital signal in the storage unit 270 . Storage unit 270 is configured by, for example, a ring buffer, and is overwritten from the oldest digital signal.
　判定部２８１は、保存処理部２９０により記憶部２７０に保存されたＫ個のサンプルからなるデジタル信号の値と、記憶部２７０におけるデジタル信号ＳＡ，ＳＢとの相関に基づいて、絶縁破壊および部分放電を検出する。 Determining unit 281 detects dielectric breakdown and partial discharge based on the correlation between the value of the digital signal consisting of K samples stored in storage unit 270 by storage processing unit 290 and the digital signals SA and SB in storage unit 270. to detect
　より詳細には、判定部２８１は、所定の算出周期に従う算出タイミングＴ１において、保存処理部２９０により記憶部２７０に保存された、時系列的に連続するＫ個のサンプルからなるデジタル信号の値と、デジタル信号ＳＡの値との相関値ＣＡを算出する。具体的には、判定部２８１は、保存処理部２９０によりデジタル信号の１つのサンプルが記憶部２７０に保存されるたびに、当該サンプルを含む直近のＫ個のサンプルからなるデジタル信号の値と、デジタル信号ＳＡの値との相関値ＣＡを算出する。すなわち、算出タイミングＴ１とは、保存処理部２９０がデジタル信号を記憶部２７０に保存する周期に従うタイミングである。判定部２８１は、算出した相関値ＣＡが所定のしきい値以上である場合、地中ケーブル１０Ａにおいて部分放電が発生したと判定する。たとえば、判定部２８１は、算出タイミングＴ１ごとの相関値ＣＡの時間変化を示す相関データを生成する。そして、判定部２８１は、地中ケーブル１０Ａにおいて部分放電が発生したと判定した場合、当該相関データにおけるピーク点の相関値ＣＡの算出に用いたＫ個のサンプルからなるデジタル信号に付与されたタイムスタンプのうちの、たとえば最も早い時刻を含む検出情報ＤＡを生成し、生成した検出情報ＤＡを通信部３３１へ出力する。また、判定部２８１は、所定の算出周期に従う算出タイミングＴ２において、保存処理部２９０により記憶部２７０に保存された、時系列的に連続するＫ個のサンプルからなるデジタル信号の値と、デジタル信号ＳＢの値との相関値ＣＢを算出する。具体的には、判定部２８１は、保存処理部２９０によりデジタル信号の１つのサンプルが記憶部２７０に保存されるたびに、当該サンプルを含む直近のＫ個のサンプルからなるデジタル信号の値と、デジタル信号ＳＢの値との相関値ＣＢを算出する。すなわち、算出タイミングＴ２とは、保存処理部２９０がデジタル信号を記憶部２７０に保存する周期に従うタイミングである。判定部２８１は、算出した相関値ＣＢが所定のしきい値以上である場合、地中ケーブル１０Ａにおいて絶縁破壊が発生したと判定する。たとえば、判定部２８１は、算出タイミングＴ２ごとの相関値ＣＢの時間変化を示す相関データを生成する。そして、判定部２８１は、地中ケーブル１０Ａにおいて絶縁破壊が発生したと判定した場合、当該相関データにおけるピーク点の相関値ＣＢの算出に用いたＫ個のサンプルからなるデジタル信号に付与されたタイムスタンプのうちの、たとえば最も早い時刻を含む検出情報ＤＢを生成し、生成した検出情報ＤＢを通信部３３１へ出力する。 More specifically, the determination unit 281 determines the value of the digital signal composed of K consecutive samples in time series, which is stored in the storage unit 270 by the storage processing unit 290, at the calculation timing T1 according to a predetermined calculation cycle. , a correlation value CA with the value of the digital signal SA is calculated. Specifically, every time one sample of the digital signal is stored in the storage unit 270 by the storage processing unit 290, the determination unit 281 stores the value of the digital signal composed of the K samples that are closest to the sample, A correlation value CA with the value of the digital signal SA is calculated. In other words, the calculation timing T1 is the timing according to the cycle in which the storage processing unit 290 stores the digital signal in the storage unit 270 . The determination unit 281 determines that partial discharge has occurred in the underground cable 10A when the calculated correlation value CA is equal to or greater than a predetermined threshold value. For example, the determination unit 281 generates correlation data indicating temporal changes in the correlation value CA at each calculation timing T1. Then, when determining that a partial discharge has occurred in the underground cable 10A, the determination unit 281 determines the time given to the digital signal composed of K samples used to calculate the correlation value CA of the peak point in the correlation data. Of the stamps, detection information DA including, for example, the earliest time is generated, and the generated detection information DA is output to communication section 331 . Further, the determination unit 281 determines the value of the digital signal, which is stored in the storage unit 270 by the storage processing unit 290 at the calculation timing T2 according to a predetermined calculation cycle, and is composed of K consecutive samples in chronological order, and the value of the digital signal A correlation value CB with the value of SB is calculated. Specifically, every time one sample of the digital signal is stored in the storage unit 270 by the storage processing unit 290, the determination unit 281 stores the value of the digital signal composed of the K samples that are closest to the sample, A correlation value CB with the value of the digital signal SB is calculated. In other words, the calculation timing T2 is the timing according to the cycle in which the storage processing unit 290 stores the digital signal in the storage unit 270 . If the calculated correlation value CB is equal to or greater than a predetermined threshold value, the determination unit 281 determines that insulation breakdown has occurred in the underground cable 10A. For example, the determination unit 281 generates correlation data indicating temporal changes in the correlation value CB at each calculation timing T2. Then, when determining that a dielectric breakdown has occurred in the underground cable 10A, the determination unit 281 determines the time given to the digital signal composed of K samples used to calculate the correlation value CB of the peak point in the correlation data. A detection information DB including, for example, the earliest time among the stamps is generated, and the generated detection information DB is output to the communication unit 331 .
　なお、異常検出部２０２は、出力信号のレベルとしきい値ＴｈＡ，ＴｈＢとの比較結果にさらに基づいて、絶縁破壊と部分放電とを判別する構成であってもよい。より詳細には、異常検出部２０２は、検波部２４０および検波部２５０をさらに含む。そして、判定部２８１は、異常検出部２００における判定部２８０と同様に、検波部２４０，２５０により記憶部２７０に保存された検波情報ｄａ，ｄｂにさらに基づいて判定処理を行う。 It should be noted that the abnormality detection unit 202 may be configured to distinguish between dielectric breakdown and partial discharge, further based on the result of comparison between the level of the output signal and the thresholds ThA and ThB. More specifically, abnormality detection section 202 further includes detection section 240 and detection section 250 . Then, similarly to the determination section 280 in the abnormality detection section 200, the determination section 281 performs determination processing further based on the detection information da and db stored in the storage section 270 by the detection sections 240 and 250. FIG.
　また、ケーブル監視装置５００は、異常検出部２００、異常検出部２０１、および異常検出部２０２のうちの少なくともいずれか２つを含む総合検出部を備える構成であってもよい。総合検出部は、異常検出部の一例である。 Further, the cable monitoring device 500 may be configured to include a comprehensive detection section including at least any two of the abnormality detection section 200, the abnormality detection section 201, and the abnormality detection section 202. The comprehensive detection section is an example of an anomaly detection section.
　この場合、当該総合検出部は、異常検出部２００による判定処理の結果、異常検出部２０１による判定処理の結果、および異常検出部２０２による判定処理の結果のうちの少なくともいずれか２つを総合的に考慮することにより、地中ケーブル１０Ａにおける部分放電および絶縁破壊を検出する。 In this case, the comprehensive detection unit comprehensively collects at least two of the results of the determination processing by the abnormality detection unit 200, the results of the determination processing by the abnormality detection unit 201, and the results of the determination processing by the abnormality detection unit 202. , the partial discharge and dielectric breakdown in the underground cable 10A are detected.
　あるいは、異常検出部２００，２０１，２０２を含む総合検出部では、ある期間ＴＡにおいて、異常検出部２００が地中ケーブル１０Ａにおける部分放電および絶縁破壊を検出し、期間ＴＡとは異なる期間ＴＢにおいて、異常検出部２０１が地中ケーブル１０Ａにおける部分放電および絶縁破壊を検出し、期間ＴＡ，ＴＢとは異なる期間ＴＣにおいて、異常検出部２０２が地中ケーブル１０Ａにおける部分放電および絶縁破壊を検出する。すなわち、総合検出部における異常検出部２００は、期間ＴＡにおいて、出力信号のレベルと所定のしきい値との比較結果に基づいて、絶縁破壊と部分放電とを判別する。また、総合検出部における異常検出部２０１は、期間ＴＢにおいて、出力信号の波形に基づいて、絶縁破壊と部分放電とを判別する。また、総合検出部における異常検出部２０２は、期間ＴＣにおいて、ＨＰＦ２１０を通過した出力信号に基づいて部分放電を検出し、ＨＰＦ２１０を通過する前の出力信号に基づいて絶縁破壊を検出する。 Alternatively, in the comprehensive detection unit including the abnormality detection units 200, 201, and 202, the abnormality detection unit 200 detects partial discharge and insulation breakdown in the underground cable 10A during a certain period TA, and during a period TB different from the period TA, Abnormality detector 201 detects partial discharge and dielectric breakdown in underground cable 10A, and abnormality detector 202 detects partial discharge and dielectric breakdown in underground cable 10A in period TC different from periods TA and TB. That is, the abnormality detection section 200 in the general detection section determines dielectric breakdown and partial discharge based on the result of comparison between the level of the output signal and a predetermined threshold during the period TA. Further, the abnormality detection section 201 in the comprehensive detection section distinguishes between dielectric breakdown and partial discharge based on the waveform of the output signal during the period TB. Further, the abnormality detection unit 202 in the comprehensive detection unit detects partial discharge based on the output signal that has passed through the HPF 210 and detects dielectric breakdown based on the output signal that has not yet passed through the HPF 210 in the period TC.
　［動作の流れ］
　本開示の実施の形態に係るケーブル監視システムにおける各装置は、メモリを含むコンピュータを備え、当該コンピュータにおけるＣＰＵ等の演算処理部は、以下のフローチャートおよびシーケンスの各ステップの一部または全部を含むプログラムを当該メモリから読み出して実行する。これら複数の装置のプログラムは、それぞれ、外部からインストールすることができる。これら複数の装置のプログラムは、それぞれ、記録媒体に格納された状態で流通する。 [Flow of operation]
Each device in the cable monitoring system according to the embodiment of the present disclosure includes a computer including a memory, and an arithmetic processing unit such as a CPU in the computer uses a program including part or all of each step of the following flowcharts and sequences. is read from the memory and executed. Programs for these multiple devices can each be installed from the outside. Programs for these devices are stored in recording media and distributed.
　図１８は、本開示の実施の形態に係るケーブル監視装置が部分放電および絶縁破壊の検出を行う際の動作手順の一例を定めたフローチャートである。図１８を参照して、まず、ケーブル監視装置５００は、地中ケーブル１０Ａの遮蔽層７５を通して流れる電流の変化、または遮蔽層７５の電位の変化に応じた出力信号を生成する（ステップＳ１０２）。 FIG. 18 is a flow chart defining an example of an operation procedure when the cable monitoring device according to the embodiment of the present disclosure detects partial discharge and dielectric breakdown. Referring to FIG. 18, first, cable monitoring device 500 generates an output signal according to a change in current flowing through shield layer 75 of underground cable 10A or a change in potential of shield layer 75 (step S102).
　次に、ケーブル監視装置５００は、検波情報ｄａを生成した場合、すなわち出力信号をデジタル変換することにより得られるデジタル信号がしきい値ＴｈＡよりも大きく、かつしきい値ＴｈＢ未満である場合（ステップＳ１０４でＹＥＳ）、地中ケーブル１０Ａにおいて部分放電が発生したと判定し、検出情報ＤＡを管理装置４００へ伝送する（ステップＳ１０６）。次に、ケーブル監視装置５００は、新たな出力信号を生成する（ステップＳ１０２）。 Next, when the cable monitoring device 500 generates the detection information da, that is, when the digital signal obtained by digitally converting the output signal is greater than the threshold ThA and less than the threshold ThB (step YES in S104), it is determined that partial discharge has occurred in the underground cable 10A, and the detection information DA is transmitted to the management device 400 (step S106). Next, cable monitoring device 500 generates a new output signal (step S102).
　一方、ケーブル監視装置５００は、検波情報ｄｂを生成した場合、すなわち出力信号をデジタル変換することにより得られるデジタル信号がしきい値ＴｈＢよりも大きい場合（ステップＳ１０４でＮＯかつステップＳ１０８でＹＥＳ）、検波情報ｄｂに含まれるカウント数が所定数たとえば５００００００以上であるか否かを判断する（ステップＳ１１０）。 On the other hand, when cable monitoring device 500 generates detection information db, that is, when the digital signal obtained by digitally converting the output signal is greater than threshold ThB (NO in step S104 and YES in step S108), It is determined whether or not the count number included in the detection information db is equal to or greater than a predetermined number, for example, 5000000 (step S110).
　ケーブル監視装置５００は、検波情報ｄｂに含まれるカウント数が５００００００未満である場合（ステップＳ１１０でＮＯ）、新たな出力信号を生成する（ステップＳ１０２）。 When the count number included in the detection information db is less than 5000000 (NO in step S110), the cable monitoring device 500 generates a new output signal (step S102).
　一方、ケーブル監視装置５００は、検波情報ｄｂに含まれるカウント数が５００００００以上である場合（ステップＳ１１０でＹＥＳ）、地中ケーブル１０Ａにおいて絶縁破壊が発生したと判定し、検出情報ＤＢを管理装置４００へ伝送する（ステップＳ１１２）。次に、ケーブル監視装置５００は、新たな出力信号を生成する（ステップＳ１０２） On the other hand, when the count number included in the detection information db is 5000000 or more (YES in step S110), the cable monitoring device 500 determines that a dielectric breakdown has occurred in the underground cable 10A, and sends the detection information DB to the management device 400. (step S112). Next, cable monitoring device 500 generates a new output signal (step S102).
　一方、ケーブル監視装置５００は、検波情報ｄａ，ｄｂを生成しなかった場合、すなわち出力信号をデジタル変換することにより得られるデジタル信号がしきい値ＴｈＡ以下である場合（ステップＳ１０４でＮＯかつステップＳ１０８でＮＯ）、新たな出力信号を生成する（ステップＳ１０２）。 On the other hand, if the cable monitoring device 500 does not generate the detection information da, db, that is, if the digital signal obtained by digitally converting the output signal is equal to or smaller than the threshold value ThA (NO in step S104 and step S108 NO), a new output signal is generated (step S102).
　図１９は、本開示の実施の形態に係るケーブル監視システムにおける判定処理のシーケンスの一例を示す図である。図１９を参照して、ケーブル監視装置５００は、定期的に同期処理を行う。具体的には、ケーブル監視装置５００Ｄは、所定周期に従う同期処理タイミングにおいて、時刻情報をケーブル監視装置５００Ａへ伝送する（ステップＳ２０２）。 FIG. 19 is a diagram showing an example of the sequence of determination processing in the cable monitoring system according to the embodiment of the present disclosure. Referring to FIG. 19, cable monitoring device 500 periodically performs synchronization processing. Specifically, the cable monitoring device 500D transmits the time information to the cable monitoring device 500A at the synchronization processing timing according to the predetermined cycle (step S202).
　次に、ケーブル監視装置５００Ａは、カウンタ３３３の時刻情報を、ケーブル監視装置５００Ｄから受信した時刻情報に更新する（ステップＳ２０４）。 Next, the cable monitoring device 500A updates the time information of the counter 333 to the time information received from the cable monitoring device 500D (step S204).
　次に、ケーブル監視装置５００Ａは、カウンタ３３３の更新後の時刻情報をケーブル監視装置５００Ｂへ伝送する（ステップＳ２０６）。また、ケーブル監視装置５００Ａは、時刻情報をケーブル監視装置５００Ｄへ伝送する（ステップＳ２０８）。 Next, the cable monitoring device 500A transmits the updated time information of the counter 333 to the cable monitoring device 500B (step S206). The cable monitoring device 500A also transmits the time information to the cable monitoring device 500D (step S208).
　次に、ケーブル監視装置５００Ｄは、ケーブル監視装置５００Ａから受信した時刻情報と、自己のカウンタ３３３の現在の時刻情報との差分の１／２を、ケーブル監視装置５００Ｄとケーブル監視装置５００Ａとの間の伝送遅延時間として算出し、算出した伝送遅延時間を示す遅延時間情報Ｄ１を管理装置４００へ伝送する（ステップＳ２１０）。 Next, cable monitoring device 500D transfers 1/2 of the difference between the time information received from cable monitoring device 500A and the current time information of its own counter 333 between cable monitoring device 500D and cable monitoring device 500A. , and transmits delay time information D1 indicating the calculated transmission delay time to the management device 400 (step S210).
　次に、ケーブル監視装置５００Ｂは、カウンタ３３３の時刻情報を、ケーブル監視装置５００Ａから受信した時刻情報に更新する（ステップＳ２１２）。 Next, the cable monitoring device 500B updates the time information of the counter 333 to the time information received from the cable monitoring device 500A (step S212).
　次に、ケーブル監視装置５００Ｂは、カウンタ３３３の更新後の時刻情報をケーブル監視装置５００Ｃへ伝送する（ステップＳ２１４）。また、ケーブル監視装置５００Ｂは、時刻情報をケーブル監視装置５００Ａへ伝送する（ステップＳ２１６）。 Next, the cable monitoring device 500B transmits the updated time information of the counter 333 to the cable monitoring device 500C (step S214). Also, the cable monitoring device 500B transmits the time information to the cable monitoring device 500A (step S216).
　次に、ケーブル監視装置５００Ａは、ケーブル監視装置５００Ｂから受信した時刻情報と、自己のカウンタ３３３の現在の時刻情報との差分の１／２を、ケーブル監視装置５００Ａとケーブル監視装置５００Ｂとの間の伝送遅延時間として算出し、算出した伝送遅延時間を示す遅延時間情報Ｄ２をケーブル監視装置５００Ｄ経由で管理装置４００へ伝送する（ステップＳ２１８）。 Next, cable monitoring device 500A transfers 1/2 of the difference between the time information received from cable monitoring device 500B and the current time information of its own counter 333 between cable monitoring device 500A and cable monitoring device 500B. , and transmits delay time information D2 indicating the calculated transmission delay time to the management device 400 via the cable monitoring device 500D (step S218).
　次に、ケーブル監視装置５００Ｃは、カウンタ３３３の時刻情報を、ケーブル監視装置５００Ｂから受信した時刻情報に更新する（ステップＳ２２０）。 Next, the cable monitoring device 500C updates the time information of the counter 333 with the time information received from the cable monitoring device 500B (step S220).
　次に、ケーブル監視装置５００Ｃは、カウンタ３３３の更新後の時刻情報をケーブル監視装置５００Ｂへ伝送する（ステップＳ２２２）。 Next, the cable monitoring device 500C transmits the updated time information of the counter 333 to the cable monitoring device 500B (step S222).
　次に、ケーブル監視装置５００Ｂは、ケーブル監視装置５００Ｃから受信した時刻情報と、自己のカウンタ３３３の現在の時刻情報との差分の１／２を、ケーブル監視装置５００Ｂとケーブル監視装置５００Ｃとの間の伝送遅延時間として算出し、算出した伝送遅延時間を示す遅延時間情報Ｄ３をケーブル監視装置５００Ａ，５００Ｄ経由で管理装置４００へ伝送する（ステップＳ２２４）。 Next, cable monitoring device 500B transfers 1/2 of the difference between the time information received from cable monitoring device 500C and the current time information of its own counter 333 between cable monitoring device 500B and cable monitoring device 500C. , and transmits delay time information D3 indicating the calculated transmission delay time to the management device 400 via the cable monitoring devices 500A and 500D (step S224).
　たとえば、ケーブル監視装置５００Ｂ，５００Ｃは、地中ケーブル１０Ａにおける部分放電を検出した場合、検出情報ＤＡを管理装置４００へ伝送する（ステップＳ２２６，Ｓ２２８）。 For example, when the cable monitoring devices 500B and 500C detect partial discharge in the underground cable 10A, they transmit detection information DA to the management device 400 (steps S226 and S228).
　次に、管理装置４００は、ケーブル監視装置５００Ｂから受信した検出情報ＤＡが示す検出時刻を遅延時間情報Ｄ１，Ｄ２を用いて補正し、ケーブル監視装置５００Ｃから受信した検出情報ＤＡが示す検出時刻を遅延時間情報Ｄ１，Ｄ２，Ｄ３を用いて補正する。そして、管理装置４００は、各検出情報ＤＡが示す補正後の検出時刻、ケーブル監視装置５００Ｂの監視位置とケーブル監視装置５００Ｃの監視位置との間の距離を示す距離情報、および地中ケーブル１０Ａにおける電流の伝搬速度を示す速度情報に基づいて、地中ケーブル１０Ａにおける部分放電の発生位置を算出する（ステップＳ２３０）。 Next, the management device 400 corrects the detection time indicated by the detection information DA received from the cable monitoring device 500B using the delay time information D1 and D2, and corrects the detection time indicated by the detection information DA received from the cable monitoring device 500C. Correction is performed using the delay time information D1, D2, and D3. Then, the management device 400 detects the corrected detection time indicated by each detection information DA, the distance information indicating the distance between the monitoring position of the cable monitoring device 500B and the monitoring position of the cable monitoring device 500C, and the Based on the speed information indicating the propagation speed of the current, the position where the partial discharge occurs in the underground cable 10A is calculated (step S230).
　次に、たとえば、ケーブル監視装置５００Ｂ，５００Ｃは、地中ケーブル１０Ａにおける絶縁破壊を検出した場合、検出情報ＤＢを管理装置４００へ伝送する（ステップＳ２３２，Ｓ２３４）。 Next, for example, when the cable monitoring devices 500B and 500C detect dielectric breakdown in the underground cable 10A, they transmit the detection information DB to the management device 400 (steps S232 and S234).
　次に、管理装置４００は、ケーブル監視装置５００Ｂから受信した検出情報ＤＢが示す検出時刻を遅延時間情報Ｄ１，Ｄ２を用いて補正し、ケーブル監視装置５００Ｃから受信した検出情報ＤＢが示す検出時刻を遅延時間情報Ｄ１，Ｄ２，Ｄ３を用いて補正する。そして、管理装置４００は、各検出情報ＤＢが示す補正後の検出時刻、ケーブル監視装置５００Ｂの監視位置とケーブル監視装置５００Ｃの監視位置との間の距離を示す距離情報、および地中ケーブル１０Ａにおける電流の伝搬速度を示す速度情報に基づいて、地中ケーブル１０Ａにおける絶縁破壊の発生位置を算出する（ステップＳ２３６）。 Next, the management device 400 corrects the detection time indicated by the detection information DB received from the cable monitoring device 500B using the delay time information D1 and D2, and corrects the detection time indicated by the detection information DB received from the cable monitoring device 500C. Correction is performed using the delay time information D1, D2, and D3. Then, the management device 400 stores the corrected detection time indicated by each detection information DB, distance information indicating the distance between the monitoring position of the cable monitoring device 500B and the monitoring position of the cable monitoring device 500C, and Based on the speed information indicating the propagation speed of the current, the position where the dielectric breakdown occurred in the underground cable 10A is calculated (step S236).
　なお、ケーブル監視装置５００Ｂ，５００Ｃが部分放電を検出して検出情報ＤＡを管理装置４００へ伝送した後、絶縁破壊を検出して検出情報ＤＢを管理装置４００へ伝送する例を挙げて説明したが、ケーブル監視装置５００は、検出情報ＤＡおよび検出情報ＤＢをこの順に管理装置４００へ伝送する構成に限定されない。ケーブル監視装置５００は、地中ケーブル１０Ａにおけるある位置の絶縁破壊を検出して検出情報ＤＢを管理装置４００へ伝送した後に、地中ケーブル１０Ａにおける他の位置の絶縁破壊を検出した場合、検出情報ＤＢを管理装置４００へ再び伝送する。また、ケーブル監視装置５００は、地中ケーブル１０Ａにおけるある位置の絶縁破壊を検出して検出情報ＤＢを管理装置４００へ伝送した後に、地中ケーブル１０Ａにおける他の位置の部分放電を検出した場合、検出情報ＤＡを管理装置４００へ伝送する。 The cable monitoring devices 500B and 500C detect partial discharge and transmit the detection information DA to the management device 400, and then detect dielectric breakdown and transmit the detection information DB to the management device 400. , the cable monitoring device 500 is not limited to the configuration in which the detection information DA and the detection information DB are transmitted to the management device 400 in this order. After detecting a dielectric breakdown at a certain position in the underground cable 10A and transmitting the detection information DB to the management device 400, the cable monitoring device 500 detects a dielectric breakdown at another position in the underground cable 10A. The DB is transmitted to the management device 400 again. Further, when the cable monitoring device 500 detects a partial discharge at another position in the underground cable 10A after detecting a dielectric breakdown at a certain position in the underground cable 10A and transmitting the detection information DB to the management device 400, It transmits the detection information DA to the management device 400 .
　なお、本開示の実施の形態に係るケーブル監視システム５０１は、４つのケーブル監視装置５００を備える構成であるとしたが、これに限定するものではない。ケーブル監視システム５０１は、２つ、３つまたは５つ以上のケーブル監視装置５００を備える構成であってもよい。また、ケーブル監視システム５０１は、地上接続部４３Ａに対応して設けられたケーブル監視装置５００Ｄを備えない構成であってもよい。また、ケーブル監視システム５０１は、ケーブル監視装置５００Ｄの代わりに、またはケーブル監視装置５００Ｄに加えて、図１に示す地上接続部４３Ｂに対応して設けられたケーブル監視装置５００を備える構成であってもよい。 Although the cable monitoring system 501 according to the embodiment of the present disclosure is configured to include four cable monitoring devices 500, it is not limited to this. Cable monitoring system 501 may be configured with two, three, or more than five cable monitoring devices 500 . Moreover, the cable monitoring system 501 may be configured without the cable monitoring device 500D provided corresponding to the ground connection section 43A. In addition, the cable monitoring system 501 includes a cable monitoring device 500 provided corresponding to the ground connection section 43B shown in FIG. 1 instead of or in addition to the cable monitoring device 500D. good too.
　また、本開示の実施の形態に係るケーブル監視システム５０１では、管理装置４００は、ケーブル監視装置５００Ｄに接続されている構成であるとしたが、これに限定するものではない。管理装置４００は、ケーブル監視装置５００Ｄ以外のケーブル監視装置５００に接続されてもよいし、いずれかのケーブル監視装置５００と一体に設けられてもよい。 Also, in the cable monitoring system 501 according to the embodiment of the present disclosure, the management device 400 is connected to the cable monitoring device 500D, but the configuration is not limited to this. The management device 400 may be connected to a cable monitoring device 500 other than the cable monitoring device 500D, or may be provided integrally with any cable monitoring device 500. FIG.
　また、本開示の実施の形態に係る管理装置４００では、取得部４２０は、複数のケーブル監視装置５００の各々から電磁結合部４１０経由で検出情報ＤＡを受信し、複数のケーブル監視装置５００の各々から電磁結合部４１０経由で検出情報ＤＢを受信する構成であるとしたが、これに限定するものではない。取得部４２０は、各ケーブル監視装置５００において生成された検出情報ＤＡ，ＤＢを、オフラインで取得する構成であってもよい。 Further, in the management device 400 according to the embodiment of the present disclosure, the acquisition unit 420 receives the detection information DA from each of the plurality of cable monitoring devices 500 via the electromagnetic coupling unit 410, and each of the plurality of cable monitoring devices 500 Although the detection information DB is received via the electromagnetic coupling unit 410 from the above, the present invention is not limited to this. The acquisition unit 420 may be configured to acquire the detection information DA and DB generated in each cable monitoring device 500 off-line.
　また、本開示の実施の形態に係るケーブル監視装置５００では、異常検出部２００は、検波部２４０および検波部２５０を含む構成であるとしたが、これに限定するものではない。異常検出部２００は、検波部２４０および検波部２５０の代わりに、保存処理部を含む構成であってもよい。この場合、当該保存処理部は、ＡＤＣ２３０から受けたデジタル信号を記憶部２７０に保存する処理を行う。判定部２８０は、当該保存処理部により記憶部２７０に保存されたデジタル信号について上述した比較処理および判定処理を行う。 Also, in the cable monitoring device 500 according to the embodiment of the present disclosure, the abnormality detection section 200 is configured to include the detection section 240 and the detection section 250, but the configuration is not limited to this. Abnormality detection section 200 may be configured to include a storage processing section instead of detection section 240 and detection section 250 . In this case, the storage processing unit performs processing for storing the digital signal received from the ADC 230 in the storage unit 270 . The determination unit 280 performs the above-described comparison processing and determination processing on the digital signal stored in the storage unit 270 by the storage processing unit.
　また、本開示の実施の形態の変形例に係るケーブル監視装置５００では、異常検出部２０１は、検波部２４０および検波部２５０を含む構成であるとしたが、これに限定するものではない。異常検出部２０１は、検波部２４０の代わりに、保存処理部を含む構成であってもよい。この場合、当該保存処理部は、ＡＤＣ２３０から受けたデジタル信号を記憶部２７０に保存する処理を行う。また、異常検出部２０１は、検波部２５０の代わりに、保存処理部を含む構成であってもよい。この場合、当該保存処理部は、ＡＤＣ２３１から受けたデジタル信号を記憶部２７０に保存する処理を行う。判定部２８０は、当該保存処理部により記憶部２７０に保存されたデジタル信号について上述した比較処理および判定処理を行う。 Also, in the cable monitoring device 500 according to the modification of the embodiment of the present disclosure, the abnormality detection unit 201 is configured to include the detection unit 240 and the detection unit 250, but it is not limited to this. The abnormality detection section 201 may be configured to include a storage processing section instead of the detection section 240 . In this case, the storage processing unit performs processing for storing the digital signal received from the ADC 230 in the storage unit 270 . Further, the abnormality detection section 201 may be configured to include a storage processing section instead of the detection section 250 . In this case, the storage processing unit performs processing for storing the digital signal received from the ADC 231 in the storage unit 270 . The determination unit 280 performs the above-described comparison processing and determination processing on the digital signal stored in the storage unit 270 by the storage processing unit.
　また、本開示の実施の形態に係るケーブル監視装置５００では、通信部３３１は、検出情報ＤＡ，ＤＢを管理装置４００へ伝送する構成であるとしたが、これに限定するものではない。通信部３３１は、検出情報ＤＡ，ＤＢの少なくともいずれか一方を管理装置４００へ伝送しない構成であってもよい。また、ケーブル監視装置５００は、通信部３３１を備えない構成であってもよい。この場合、管理装置４００は、上述のように、各ケーブル監視装置５００において生成された検出情報ＤＡ，ＤＢをオフラインで取得する。より詳細には、判定部２８０は、生成した検出情報ＤＡ，ＤＢを記憶部２７０に保存する。ケーブル監視システム５０１の管理者は、定期的または不定期に、ケーブル監視装置５００にＵＳＢメモリ等の記録媒体を接続し、記憶部２７０における検出情報ＤＡ，ＤＢを当該記録媒体にコピーする。そして、当該管理者は、検出情報ＤＡ，ＤＢがコピーされた当該記録媒体を管理装置４００に接続し、管理装置４００における記憶部４５０に検出情報ＤＡ，ＤＢを保存する。管理装置４００における部分放電算出部４３０および絶縁破壊算出部４４０は、管理者により記憶部４５０に保存された検出情報ＤＡ，ＤＢに基づいて、部分放電および絶縁破壊の発生位置を算出する。また、この場合、ケーブル監視装置５００は、たとえば、ＧＰＳ（Ｇｌｏｂａｌ　Ｐｏｓｉｔｉｏｎｉｎｇ　Ｓｙｓｔｅｍ）信号を受信し、受信したＧＰＳ信号に基づいて現在時刻を取得してカウンタ３３３の時刻情報を更新する。 Also, in the cable monitoring device 500 according to the embodiment of the present disclosure, the communication unit 331 is configured to transmit the detection information DA and DB to the management device 400, but the configuration is not limited to this. The communication unit 331 may be configured not to transmit at least one of the detection information DA and DB to the management device 400 . Moreover, the cable monitoring device 500 may be configured without the communication unit 331 . In this case, the management device 400 acquires the detection information DA, DB generated in each cable monitoring device 500 off-line as described above. More specifically, the determination unit 280 stores the generated detection information DA and DB in the storage unit 270 . The administrator of the cable monitoring system 501 periodically or irregularly connects a recording medium such as a USB memory to the cable monitoring device 500 and copies the detection information DA, DB in the storage unit 270 to the recording medium. Then, the administrator connects the recording medium on which the detection information DA and DB are copied to the management device 400 and saves the detection information DA and DB in the storage unit 450 of the management device 400 . The partial discharge calculation unit 430 and the dielectric breakdown calculation unit 440 in the management device 400 calculate the occurrence positions of partial discharge and dielectric breakdown based on the detection information DA and DB stored in the storage unit 450 by the administrator. Also, in this case, the cable monitoring device 500 receives, for example, a GPS (Global Positioning System) signal, obtains the current time based on the received GPS signal, and updates the time information of the counter 333 .
　また、本開示の実施の形態に係るケーブル監視装置５００は、同期部３３２を備える構成であるとしたが、これに限定するものではない。ケーブル監視装置５００は、同期部３３２を備えない構成であってもよい。 Also, although the cable monitoring device 500 according to the embodiment of the present disclosure is configured to include the synchronization unit 332, it is not limited to this. The cable monitoring device 500 may be configured without the synchronization unit 332 .
　上記実施の形態は、すべての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、上記説明ではなく請求の範囲によって示され、請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The above embodiments should be considered as examples in all respects and not restrictive. The scope of the present invention is indicated by the scope of the claims rather than the above description, and is intended to include all changes within the meaning and scope equivalent to the scope of the claims.
　以上の説明は、以下に付記する特徴を含む。
　［付記１］
　電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視するケーブル監視装置であって、
　前記遮蔽層を通して流れる電流の変化、または前記遮蔽層の電位の変化に応じた出力信号を出力する信号検出部と、
　前記信号検出部から出力される前記出力信号に基づいて、前記ケーブルにおける部分放電および絶縁破壊を検出する異常検出部とを備え、
　前記異常検出部は、所定の周波数以下の成分を減衰させるハイパスフィルタを通過した前記出力信号に基づいて前記部分放電を検出し、前記ハイパスフィルタを通過する前の前記出力信号に基づいて前記絶縁破壊を検出し、
　前記異常検出部は、前記出力信号のレベルが所定値以上の状態が所定期間継続した場合、前記ケーブルにおいて前記絶縁破壊が発生したと判定し、前記出力信号のレベルが前記所定値以上の状態が前記所定期間継続しない場合、前記ケーブルにおいて開閉サージが発生したと判定する、ケーブル監視装置。 The above description includes features appended below.
[Appendix 1]
A cable monitoring device for monitoring a cable having a linear conductor that transmits electric power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer,
a signal detection unit that outputs an output signal according to a change in current flowing through the shielding layer or a change in potential of the shielding layer;
an abnormality detection unit that detects partial discharge and dielectric breakdown in the cable based on the output signal output from the signal detection unit;
The abnormality detection unit detects the partial discharge based on the output signal that has passed through a high-pass filter that attenuates components below a predetermined frequency, and detects the dielectric breakdown based on the output signal that has not passed through the high-pass filter. to detect
The abnormality detection unit determines that the dielectric breakdown has occurred in the cable when a state in which the level of the output signal is equal to or higher than a predetermined value continues for a predetermined period of time, and the state in which the level of the output signal is equal to or higher than the predetermined value is determined. A cable monitoring device that determines that an opening/closing surge has occurred in the cable if it does not continue for the predetermined period of time.
　［付記２］
　電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視する互いに異なる位置に設置された複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報、および前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報を取得する取得部と、
　前記取得部により取得された前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出する第１算出部と、
　前記取得部により取得された前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出する第２算出部とを備え、
　前記取得部は、前記複数のケーブル監視装置の間の伝送遅延時間をさらに取得し、
　前記第１算出部は、前記各第１検出情報が示す時刻を、前記伝送遅延時間を用いて補正し、前記各第１検出情報の補正後の時刻に基づいて、前記部分放電の発生位置を算出し、
　前記第２算出部は、前記各第２検出情報が示す時刻を、前記伝送遅延時間を用いて補正し、前記各第２検出情報の補正後の時刻に基づいて、前記絶縁破壊の発生位置を算出する、管理装置。 [Appendix 2]
A plurality of cable monitors installed at different positions for monitoring a cable having a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is the conductor that surrounds the insulating layer Obtaining a plurality of first detection information each indicating a time at which a device detects partial discharge in the cable and a plurality of second detection information each indicating a time at which the plurality of cable monitoring devices detect a dielectric breakdown in the cable. an acquisition unit;
a first calculation unit that calculates the occurrence position of the partial discharge in the cable based on each of the first detection information acquired by the acquisition unit;
a second calculation unit that calculates a position where the dielectric breakdown occurs in the cable based on each of the second detection information acquired by the acquisition unit;
The acquisition unit further acquires a transmission delay time between the plurality of cable monitoring devices,
The first calculator corrects the time indicated by each of the first detection information using the transmission delay time, and calculates the occurrence position of the partial discharge based on the corrected time of each of the first detection information. calculate,
The second calculator corrects the time indicated by each of the second detection information using the transmission delay time, and calculates the occurrence position of the dielectric breakdown based on the corrected time of each of the second detection information. A management device that calculates.
　１０，１０Ａ，１０Ａ１，１０Ａ２，１０Ｂ，１０Ｂ１，１０Ｂ２，１０Ｃ，１０Ｃ１，１０Ｃ２　　地中ケーブル
　１１，１１Ａ，１１Ｂ，１１Ｃ　　ケーブル端末
　１２　　ワイヤ
　１３，１５　　接地ノード
　３１　　マンホール
　４１，４１Ａ，４１Ｂ　　普通接続部
　４２，４２Ａ，４２Ｂ，４２Ｃ　　絶縁接続部
　４３，４３Ａ，４３Ｂ　　地上接続部
　５３　　導電ケーブル
　７１　　導体
　７２　　内部半導電層
　７３　　絶縁体
　７４　　外部半導電層
　７５　　遮蔽層
　７６　　シース
　７７　　絶縁筒
　８１　　端子
　１００，１００Ａ　　信号検出部
　１１０，３１０，４１１　　ＣＴ
　１２０，１２０Ａ，４１２　　信号出力部
　１０１，３０１　　リングコア
　１０２，３０２　　巻線
　１０５，１０６　　金属箔電極
　２００，２０１，２０２　　異常検出部
　２１０　　ＨＰＦ
　２２０，２２１　　ＬＮＡ
　２３０，２３１　　ＡＤＣ
　２４０，２５０　　検波部
　２７０，４５０　　記憶部
　２８０，２８１　　判定部
　２９０　　保存処理部
　３００，４１０　　電磁結合部
　３２０　　　　　　信号入出力部
　３３１　　通信部
　３３２　　同期部
　３３３　　カウンタ
　４００　　管理装置
　４２０　　取得部
　４３０　　部分放電算出部
　４４０　　絶縁破壊算出部
　５００，５００Ａ，５００Ｂ，５００Ｃ　　ケーブル監視装置
　５０１　　ケーブル監視システム
　５０２　　送電システム
  10, 10A, 10A1, 10A2, 10B, 10B1, 10B2, 10C, 10C1, 10C2 underground cable 11, 11A, 11B, 11C cable terminal 12 wire 13, 15 ground node 31 manhole 41, 41A, 41B common connection 42, 42A, 42B, 42C Insulation connection part 43, 43A, 43B Ground connection part 53 Conductive cable 71 Conductor 72 Internal semiconducting layer 73 Insulator 74 External semiconducting layer 75 Shielding layer 76 Sheath 77 Insulating tube 81 Terminal 100, 100A Signal detector 110, 310, 411 CT
120, 120A, 412 Signal output section 101, 301 Ring core 102, 302 Winding 105, 106 Metal foil electrode 200, 201, 202 Abnormality detection section 210 HPF
220, 221 LNAs
230, 231 ADCs
240, 250 detection unit 270, 450 storage unit 280, 281 determination unit 290 storage processing unit 300, 410 electromagnetic coupling unit 320 signal input/output unit 331 communication unit 332 synchronization unit 333 counter 400 management device 420 acquisition unit 430 partial discharge calculation unit 440 Dielectric breakdown calculator 500, 500A, 500B, 500C Cable monitoring device 501 Cable monitoring system 502 Power transmission system

Claims (10)

  1. 　電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視するケーブル監視装置であって、
    　前記遮蔽層を通して流れる電流の変化、または前記遮蔽層の電位の変化に応じた出力信号を出力する信号検出部と、
    　前記信号検出部から出力される前記出力信号に基づいて、前記ケーブルにおける部分放電および絶縁破壊を検出する異常検出部とを備える、ケーブル監視装置。     A cable monitoring device for monitoring a cable having a linear conductor that transmits electric power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer,
    a signal detection unit that outputs an output signal according to a change in current flowing through the shielding layer or a change in potential of the shielding layer;
    A cable monitoring device, comprising: an abnormality detection section that detects partial discharge and dielectric breakdown in the cable based on the output signal output from the signal detection section.
  2. 　前記異常検出部は、前記出力信号のレベルと所定のしきい値との比較結果に基づいて、前記部分放電と前記絶縁破壊とを判別する、請求項１に記載のケーブル監視装置。 The cable monitoring device according to claim 1, wherein the abnormality detection section distinguishes between the partial discharge and the insulation breakdown based on a comparison result between the level of the output signal and a predetermined threshold value.
  3. 　前記異常検出部は、前記出力信号の波形に基づいて、前記部分放電と前記絶縁破壊とを判別する、請求項１または請求項２に記載のケーブル監視装置。 The cable monitoring device according to claim 1 or 2, wherein the abnormality detection section distinguishes between the partial discharge and the dielectric breakdown based on the waveform of the output signal.
  4. 　前記異常検出部は、所定の周波数以下の成分を減衰させるハイパスフィルタを通過した前記出力信号に基づいて前記部分放電を検出し、前記ハイパスフィルタを通過する前の前記出力信号に基づいて前記絶縁破壊を検出する、請求項１から請求項３のいずれか１項に記載のケーブル監視装置。 The abnormality detection unit detects the partial discharge based on the output signal that has passed through a high-pass filter that attenuates components of a frequency lower than a predetermined frequency, and detects the dielectric breakdown based on the output signal that has not passed through the high-pass filter. 4. The cable monitoring device according to any one of claims 1 to 3, which detects
  5. 　前記ケーブル監視装置は、さらに、
    　前記異常検出部が前記部分放電を検出した時刻を他の装置へ通知する通知部を備える、請求項１から請求項４のいずれか１項に記載のケーブル監視装置。     The cable monitoring device further comprises:
    The cable monitoring device according to any one of claims 1 to 4, further comprising a notification unit that notifies another device of the time when the abnormality detection unit detected the partial discharge.
  6. 　前記ケーブル監視装置は、さらに、
    　前記異常検出部が前記絶縁破壊を検出した時刻を他の装置へ通知する通知部を備える、請求項１から請求項５のいずれか１項に記載のケーブル監視装置。     The cable monitoring device further comprises:
    The cable monitoring device according to any one of claims 1 to 5, further comprising a notification unit that notifies another device of the time when the abnormality detection unit detects the dielectric breakdown.
  7. 　前記ケーブル監視装置は、さらに、
    　前記ケーブルを監視する他の前記ケーブル監視装置との通信により前記他のケーブル監視装置との時刻同期をとるための処理を行う同期部を備える、請求項１から請求項６のいずれか１項に記載のケーブル監視装置。     The cable monitoring device further comprises:
    7. The apparatus according to any one of claims 1 to 6, further comprising a synchronization unit that performs processing for synchronizing time with said other cable monitoring device through communication with said other cable monitoring device that monitors said cable. A cable monitoring device as described.
  8. 　電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視する互いに異なる位置に設置された複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報、および前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報を取得する取得部と、
    　前記取得部により取得された前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出する第１算出部と、
    　前記取得部により取得された前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出する第２算出部とを備える、管理装置。     A plurality of cable monitors installed at different positions for monitoring a cable having a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is the conductor that surrounds the insulating layer Obtaining a plurality of first detection information each indicating a time at which a device detects partial discharge in the cable and a plurality of second detection information each indicating a time at which the plurality of cable monitoring devices detect a dielectric breakdown in the cable. an acquisition unit;
    a first calculation unit that calculates the occurrence position of the partial discharge in the cable based on each of the first detection information acquired by the acquisition unit;
    A management device, comprising: a second calculation unit that calculates a position where the dielectric breakdown occurs in the cable based on each of the second detection information acquired by the acquisition unit.
  9. 　電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視する互いに異なる位置に設置された複数のケーブル監視装置と、
    　前記複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報と、前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報とを取得する管理装置とを備え、
    　前記管理装置は、取得した前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出し、取得した前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出する、ケーブル監視システム。     A plurality of cable monitors installed at different positions for monitoring a cable having a linear conductor that transmits power, an insulating layer that surrounds the conductor, and a shielding layer that is the conductor that surrounds the insulating layer a device;
    A plurality of first detection information indicating times when the plurality of cable monitoring devices detect partial discharge in the cable, and a plurality of second detection information indicating times when the plurality of cable monitoring devices detect dielectric breakdown in the cable. and a management device for acquiring detection information,
    The management device calculates the occurrence position of the partial discharge in the cable based on the acquired first detection information, and based on the acquired second detection information, the occurrence of the dielectric breakdown in the cable. Cable monitoring system that calculates position.
  10. 　互いに異なる位置に設置された複数のケーブル監視装置と、管理装置とを備えるケーブル監視システムにおけるケーブル監視方法であって、
    　前記複数のケーブル監視装置が、電力を伝送する線状の導体と、前記導体の周囲を覆う絶縁層と、前記絶縁層の周囲を覆う導体である遮蔽層とを有するケーブルを監視するステップと、
    　前記管理装置が、前記複数のケーブル監視装置が前記ケーブルにおける部分放電を検出した時刻をそれぞれ示す複数の第１検出情報を取得するステップと、
    　前記管理装置が、前記複数のケーブル監視装置が前記ケーブルにおける絶縁破壊を検出した時刻をそれぞれ示す複数の第２検出情報とを取得するステップと、
    　前記管理装置が、取得した前記各第１検出情報に基づいて、前記ケーブルにおける前記部分放電の発生位置を算出するステップと、
    　前記管理装置が、取得した前記各第２検出情報に基づいて、前記ケーブルにおける前記絶縁破壊の発生位置を算出するステップとを含む、ケーブル監視方法。
     
     
     
          A cable monitoring method in a cable monitoring system comprising a plurality of cable monitoring devices installed at mutually different positions and a management device, comprising:
    a step in which the plurality of cable monitoring devices monitor a cable having a linear conductor that transmits electric power, an insulating layer that surrounds the conductor, and a shielding layer that is a conductor that surrounds the insulating layer;
    obtaining, by the management device, a plurality of pieces of first detection information each indicating times at which the plurality of cable monitoring devices detected partial discharge in the cable;
    a step in which the management device acquires a plurality of pieces of second detection information each indicating a time at which the plurality of cable monitoring devices detected a dielectric breakdown in the cable;
    a step in which the management device calculates a position where the partial discharge occurs in the cable based on the acquired first detection information;
    A cable monitoring method, wherein the management device calculates a location where the dielectric breakdown occurs in the cable based on the obtained second detection information.
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Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04181177A (en) * 1990-11-15 1992-06-29 Fujikura Ltd Partial discharge detector
JPH0591639A (en) * 1991-09-27 1993-04-09 Showa Electric Wire & Cable Co Ltd Detecting method for malfunction of cable connector
JPH06331686A (en) * 1993-05-24 1994-12-02 Furukawa Electric Co Ltd:The Insulation deterioration monitoring system
JPH09159720A (en) * 1995-12-05 1997-06-20 Fuji Electric Co Ltd Apparatus for monitoring stain of outdoor insulator
JPH10104304A (en) * 1996-06-14 1998-04-24 Electricite De France Device and method for detecting defective insulation of device connected to power transmission or distribution network
KR101320433B1 (en) * 2012-05-30 2013-10-23 주식회사 와이즈오토모티브 Apparatus for detecting insulation partial discharge signal
JP2016206035A (en) * 2015-04-23 2016-12-08 一般財団法人 関西電気保安協会 High-voltage insulation monitoring device
JP2019011956A (en) * 2017-06-29 2019-01-24 株式会社サムス Cable breakage detector and cable breakage detection method
JP2019027785A (en) * 2017-07-25 2019-02-21 矢崎エナジーシステム株式会社 Insulation deterioration diagnostic method and diagnostic apparatus for high-voltage aerial cable connector
WO2020161967A1 (en) * 2019-02-04 2020-08-13 住友電気工業株式会社 Partial discharge detection device

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04181177A (en) * 1990-11-15 1992-06-29 Fujikura Ltd Partial discharge detector
JPH0591639A (en) * 1991-09-27 1993-04-09 Showa Electric Wire & Cable Co Ltd Detecting method for malfunction of cable connector
JPH06331686A (en) * 1993-05-24 1994-12-02 Furukawa Electric Co Ltd:The Insulation deterioration monitoring system
JPH09159720A (en) * 1995-12-05 1997-06-20 Fuji Electric Co Ltd Apparatus for monitoring stain of outdoor insulator
JPH10104304A (en) * 1996-06-14 1998-04-24 Electricite De France Device and method for detecting defective insulation of device connected to power transmission or distribution network
KR101320433B1 (en) * 2012-05-30 2013-10-23 주식회사 와이즈오토모티브 Apparatus for detecting insulation partial discharge signal
JP2016206035A (en) * 2015-04-23 2016-12-08 一般財団法人 関西電気保安協会 High-voltage insulation monitoring device
JP2019011956A (en) * 2017-06-29 2019-01-24 株式会社サムス Cable breakage detector and cable breakage detection method
JP2019027785A (en) * 2017-07-25 2019-02-21 矢崎エナジーシステム株式会社 Insulation deterioration diagnostic method and diagnostic apparatus for high-voltage aerial cable connector
WO2020161967A1 (en) * 2019-02-04 2020-08-13 住友電気工業株式会社 Partial discharge detection device

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