CN110579688A - Cable overhead line hybrid line fault current sampling device and online monitoring system - Google Patents
Cable overhead line hybrid line fault current sampling device and online monitoring system Download PDFInfo
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- CN110579688A CN110579688A CN201910906881.6A CN201910906881A CN110579688A CN 110579688 A CN110579688 A CN 110579688A CN 201910906881 A CN201910906881 A CN 201910906881A CN 110579688 A CN110579688 A CN 110579688A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
- G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
- G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- 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
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/083—Locating faults in cables, transmission lines, or networks according to type of conductors in cables, e.g. underground
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- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The invention discloses a cable overhead line hybrid line fault current sampling device and an online monitoring system, wherein the device comprises a main control module, a clock synchronization module, a wireless communication module, a signal conditioning module, a current sampling module and a temperature sampling module; after the signal conditioning module processes the current signal, the current signal is sampled by a current sampling module; the temperature sampling module samples temperature information at two ends of a cable section of the hybrid power transmission line and sends the temperature information to the main control module; the master control module synchronously samples grounding current and load current signals at two ends of a cable section of the hybrid transmission line and temperature signals at two ends of the cable section of the hybrid transmission line in different grounding modes according to the Beidou time service signal received by the clock synchronization module, calculates current variation of bodies at two ends of the cable and a grounding wire in the moment of fault occurrence in different grounding modes, judges whether a ground short circuit fault occurs or not by combining fault characteristics of the cable to ground short circuit fault to the hybrid line, and positions of fault points.
Description
Technical Field
The utility model relates to a short-circuit current sampling technical field, concretely relates to current sampling device and trouble on-line monitoring system of cable overhead line hybrid line fault section location based on synchronous sampling technique.
background
with the rapid development of national economy, the power demand is increasing day by day, and the construction of power transmission lines is synchronously increased; meanwhile, as urban construction is accelerated continuously, and the ground cabling rate of the line is improved continuously based on urban space and safety considerations, more and more overhead line and power cable mixed lines appear in a power supply network and mainly exist in overhead line-power cable-overhead line, overhead line-power cable, power cable-overhead line and other mixed power transmission forms; the hybrid power transmission network is complex, the lengths of lines are unequal, and the specification parameters of cables are various, so that the power supply reliability and safety are challenged.
Most of mixed line faults are caused by tripping due to overhead lines, the faults of the overhead lines are more instantaneous faults, the faults can be recovered, and reclosing is generally allowed under the condition of shortening the power recovery time; however, if a fault occurs in a cable section, reclosing may cause secondary damage to the cable, even cause an expanded fault range, damaged joints, deteriorated cable, and possibly cause a fire to burn out adjacent loops and the whole cable channel, and the loss is immeasurable, so that reclosing needs to be locked; cable faults are most common (accounting for about 80%) in single-to-ground short circuit, so that the method can quickly judge and position single-to-ground short circuit fault points of the overhead-cable hybrid line from the aspects of safe power operation, line protection and inspection cost saving, and is very necessary for providing criteria for reclosure and remarkable in economic benefit;
In order to put the reclosing into the system under the precondition that certain instantaneous faults are generated and the safety and reliability of the equipment are met, the fault generation in the overhead section or the underground high-voltage cable section must be positioned, so that the fault power failure time is shortened, and the economic loss is reduced; therefore, there is a need to develop a device capable of locating the fault section of the hybrid line, so as to provide necessary technical means and quantitative conditions for the comprehensive decision of power production. At present, deep research is also carried out on the positioning of a fault section of a hybrid line at home and abroad, the methods mainly adopted at present are double-end fault positioning, traveling wave reflection and the like, and the inventor finds that the double-end fault positioning method has the problem of clock synchronization and the traveling wave reflection method has the problem of difficult extraction caused by weak secondary reflected waves in the research and development process.
Disclosure of Invention
In order to overcome the defects of the prior art, the utility model provides a cable overhead line hybrid line fault current sampling device and an online monitoring system.
the technical scheme of the cable overhead line hybrid line fault current sampling device provided by the disclosure is as follows:
A fault current sampling device for a cable overhead line hybrid line comprises a main control module, a clock synchronization module, a wireless communication module, a signal conditioning module, a current sampling module and a temperature sampling module;
The signal conditioning module processes received grounding current and load current signals at two ends of the cable section of the hybrid power transmission line in different grounding modes, samples the signals by the current sampling module and sends the signals to the main control module;
The temperature sampling module samples temperature information at two ends of a cable section of the hybrid power transmission line and sends the temperature information to the main control module;
The master control module synchronously samples grounding current and load current signals at two ends of a cable section of the hybrid transmission line and temperature signals at two ends of the cable section of the hybrid transmission line in different grounding modes according to the Beidou time service signal received by the clock synchronization module, calculates current variation of bodies at two ends of the cable and a grounding wire in the moment of fault in different grounding modes, compares short-circuit current fingerprint libraries in different working conditions by combining fault characteristics of the cable to the hybrid line in the case of short-circuit fault to the ground, eliminates transient pulse current interference signals and other interference signals generated by various transient high voltages, judges whether short-circuit fault to the ground occurs or not, and positions of fault points.
Furthermore, the main control module compares the ground current or load current value of the two ends of the cable section of the sampled hybrid power transmission line with a set current sampling threshold value, records the sampling time when the ground current or load current value of the two ends of the cable section of the hybrid power transmission line exceeds the set current sampling threshold value, and uploads the ground current or load current data of the two ends of the cable section of the hybrid power transmission line in a set time period before and after the sampling time to the remote monitoring platform through the wireless communication module.
Furthermore, the master control module uploads the temperature data at two ends of the cable section of the hybrid power transmission line to the remote monitoring platform in real time through the wireless communication module according to the set temperature parameter uploading period.
Furthermore, the intelligent alarm system also comprises an alarm indicator light connected with the main control module.
Further, the main control module comprises a microcontroller, and the current sampling module comprises a current sampling chip; the temperature sampling module comprises a temperature sampling chip.
Furthermore, the clock synchronization module comprises a Beidou time service navigation module.
Further, the wireless communication module comprises one or more of an RS485 serial port module, an industrial ethernet communication module or a 4G wireless communication module.
Another aspect of the present disclosure provides an online fault monitoring system for a hybrid line of an overhead cable, comprising:
The system comprises the cable overhead line hybrid line fault current sampling device, a wireless communication base station, a front-end server, a remote monitoring platform and an intelligent terminal, wherein the cable overhead line hybrid line fault current sampling device is in data interaction with the front-end server, the remote monitoring platform and the intelligent terminal through the wireless communication base station.
Through above-mentioned technical scheme, this disclosed beneficial effect is:
The method and the device realize monitoring of fault currents at two ends of the cable section of the hybrid power transmission line, measure and calculate the current change rule of the body at two ends of the cable and the grounding wire in the moment of fault in different grounding modes, intelligently judge whether the ground short circuit fault occurs or not and position the position of the fault point by combining the influence and fault characteristics of the ground short circuit fault on the hybrid line, and provide accurate and effective basis for reclosing operation or not.
drawings
The accompanying drawings, which are incorporated in and constitute a part of this disclosure, are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the application and not to limit the disclosure.
Fig. 1 is a block diagram of a fault current sampling device of a hybrid cable-overhead line according to an embodiment;
FIG. 2 is a block diagram of a signal conditioning module according to a first embodiment;
Fig. 3 is a schematic structural diagram of a fault online monitoring system of a hybrid line of a second cable overhead line according to an embodiment.
Detailed Description
The present disclosure is further described with reference to the following drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
Example one
fig. 1 is a block diagram of a fault current sampling device for a cable overhead line hybrid line based on a synchronous sampling technique according to an embodiment. Referring to the attached drawing 1, the device comprises a main control module 1, a clock synchronization module 2, a wireless communication module 3, a signal conditioning module 4, a current sampling module 5, a temperature sampling module 6 and an alarm module 7, wherein the main control module 1 is connected with the clock synchronization module 2, the wireless communication module 3, the current sampling module 5, the temperature sampling module 6 and the alarm module 7, the input end of the signal conditioning module 4 is connected with a grounding current transformer and a load current transformer which are installed at two ends of a cable section of a hybrid power transmission line, the output end of the signal conditioning module 4 is connected with the current sampling module 5, and the input end of the temperature sampling module 5 is connected with thermocouples which are installed at two ends of the cable section of the hybrid power transmission line, wherein:
And the signal conditioning module 4 is used for filtering and amplifying the received grounding current and load current signals at the two ends of the cable section of the hybrid power transmission line and sending the processed grounding current and load current signals at the two ends of the cable section of the hybrid power transmission line to the current sampling module.
And the current sampling module 5 is used for sampling the grounding current and load current signals at the two ends of the cable section of the hybrid power transmission line processed by the signal conditioning module and transmitting the signals to the main control module.
and the temperature sampling module 6 is used for sampling temperature signals at two ends of the cable section of the hybrid power transmission line acquired by the thermocouple and transmitting the temperature signals to the main control module.
The clock synchronization module 2 is used for receiving Beidou time service signals and transmitting the Beidou time service signals to the main control module;
The main control module 1 is used for synchronously sampling grounding current and load current signals at two ends of a cable section of the hybrid power transmission line under different grounding modes and temperature signals at two ends of the cable section of the hybrid power transmission line by using Beidou time service signals, comparing the sampled grounding current or load current values at two ends of the cable section of the hybrid power transmission line with a set current sampling threshold value, recording the sampling time when the sampled grounding current or load current values at two ends of the cable section of the hybrid power transmission line exceed the set current sampling threshold value, uploading grounding current or load current data at two ends of the cable section of the hybrid power transmission line of 10mS before and after the sampling time to a remote monitoring platform through a wireless communication module, calculating current change rules of bodies at two ends of the cable and a grounding wire under different grounding modes at the moment of fault, and combining the influence and fault characteristics of the cable on a ground short-circuit fault on the hybrid line, comparing short-circuit current fingerprint libraries under different working conditions, eliminating instantaneous pulse current interference signals and other interference signals generated by various instantaneous high voltages, intelligently judging whether a ground short-circuit fault occurs and positioning the position of a fault point; meanwhile, according to a set temperature parameter uploading period, temperature data at two ends of the cable section of the hybrid power transmission line are uploaded to a remote monitoring platform in real time through a wireless communication module.
and the wireless communication module 6 is used for realizing data interaction between the main control module and the remote monitoring platform.
And the alarm module 7 is used for giving an alarm when the grounding current or the load current value at two ends of the cable section of the sampled hybrid power transmission line exceeds a set current sampling threshold value.
In this embodiment, the main control module 1 adopts an STM32F249 type ARM microcontroller, the STM32F249 uses Cortex-M4 as an inner core, and has 2MB of Flash, 256KB of SRAM, and rich I/O port resources, and the dominant frequency is as high as 180 MHz.
fig. 2 is a block diagram of a signal conditioning module. Referring to fig. 2, the signal conditioning module 4 includes a filter circuit, an amplifier circuit, and an integrator circuit, the filter circuit, the amplifier circuit, and the integrator circuit are sequentially connected, and current signals collected by the load current transformer and the ground current transformer are filtered by the filter circuit, amplified by the amplifier circuit, and integrated by the integrator circuit, and then sent to the current sampling module 5.
in this embodiment, the current sampling module 5 includes a current sampling chip, and the current sampling chip adopts an AD chip AD7606 with a 6-channel 16-bit resolution of ADI corporation, where AD7606 is a high-precision 16-bit ADC chip, 8-channel analog input, the resolution is 16 bits, the maximum sampling frequency is 200Ksps, a built-in reference, a single 5V power supply, and an SPI interface or a 16-bit bus interface.
In this embodiment, the temperature sampling module 6 includes a temperature sampling chip, the temperature sampling chip is an ADS1247 type temperature sampling chip, and the ADS1247 is a high-performance and high-precision 24-bit analog-to-digital converter proposed by the TI company.
In this embodiment, the clock synchronization module 2 adopts a Unistar high-precision Beidou time service navigation module CC50III-BG-T, and the navigation module performs clock synchronization in a dual-mode high-precision time service mode, wherein the synchronization precision reaches 15 nS.
In this embodiment, the wireless communication module 3 may adopt an RS485 serial port module, an industrial ethernet communication module, and a 4G wireless communication module; the 4G wireless communication module adopts an EC20 module for remote communication and is in wireless communication connection with a remote server through an EC20 module.
In this embodiment, the alarm module 7 employs an alarm indicator light, and when the ground current or the load current value at two ends of the cable section of the sampled hybrid power transmission line exceeds a set current sampling threshold value, the main control module controls the alarm indicator light to be on.
The cable overhead line hybrid line fault current sampling device related to the embodiment further comprises a synchronous time service antenna connected with the clock synchronization module and a wireless communication antenna connected with the wireless communication module.
the cable overhead line hybrid line fault current sampling device that this embodiment relates to has realized the monitoring of hybrid transmission line cable section both ends fault current, measures and calculates cable both ends body and earth connection current change rule in the twinkling of an eye that breaks down under the different ground connection modes, combines cable short-circuit fault to the ground influence and the fault signature of hybrid line, and whether intelligent judgement takes place to ground short-circuit fault and fixes a position fault point position, provides accurate effectual foundation for carrying out reclosing operation for whether.
Example two
fig. 3 is a schematic structural diagram of a cable overhead line hybrid line fault online monitoring system according to an embodiment. Referring to the attached figure 3, the system comprises temperature sensors respectively arranged at two ends of a cable section of the hybrid transmission line, a load current transformer and a ground current transformer which are arranged at two ends of the cable section of the hybrid transmission line, a cable overhead line hybrid line fault current sampling device respectively arranged at two ends of the cable section of the hybrid transmission line, a wireless communication base station, a front-end server, a remote monitoring platform and an intelligent terminal, wherein the cable overhead line hybrid line fault current sampling device is connected with the corresponding temperature sensor, the load current transformer and the ground current transformer, synchronously samples temperature, load current and ground current signals at two ends of the cable section of the hybrid transmission line, transmits the signals to the front-end server in a wired mode, and transmits the signals to the front-end server, the remote monitoring platform and the intelligent terminal through a wireless network and the wireless communication base; the current change rule of the bodies at two ends of the cable and the grounding wire in the fault moment under different grounding modes is measured and calculated through the cable overhead line hybrid line fault current sampling device, the influence and fault characteristics of the cable to ground short circuit fault on the hybrid line are combined, whether the ground short circuit fault occurs or not is intelligently judged, the position of the fault point is located, and an accurate and effective basis is provided for whether reclosing operation is carried out or not.
For a specific structure of the fault current sampling device for a hybrid cable-overhead line of this embodiment, please refer to the related description of the previous embodiment, which is not described herein again.
In this embodiment, the temperature sensor employs a PT1000 thermistor, and the load current transformer and the ground current transformer employ rogowski coils, respectively.
In this embodiment, the remote monitoring platform employs a server.
in this embodiment, the front-end server is connected to an audible and visual alarm, and although the above description is provided with reference to the accompanying drawings for describing the specific embodiment of the present disclosure when a short-circuit to ground occurs, the scope of the present disclosure is not limited thereto, and it should be understood by those skilled in the art that, based on the technical solutions of the present disclosure, various modifications or variations that may be made by those skilled in the art without creative efforts are still within the scope of the present disclosure.
Claims (8)
1. a cable overhead line hybrid line fault current sampling device is characterized by comprising a main control module, a clock synchronization module, a wireless communication module, a signal conditioning module, a current sampling module and a temperature sampling module;
The signal conditioning module processes received grounding current and load current signals at two ends of the cable section of the hybrid power transmission line in different grounding modes, samples the signals by the current sampling module and sends the signals to the main control module;
The temperature sampling module samples temperature information at two ends of a cable section of the hybrid power transmission line and sends the temperature information to the main control module;
The master control module synchronously samples grounding current and load current signals at two ends of a cable section of the hybrid transmission line and temperature signals at two ends of the cable section of the hybrid transmission line in different grounding modes according to the Beidou time service signal received by the clock synchronization module, calculates current variation of bodies at two ends of the cable and a grounding wire in the moment of fault in different grounding modes, compares short-circuit current fingerprint libraries in different working conditions by combining fault characteristics of the cable to the hybrid line in the case of short-circuit fault to the ground, eliminates transient pulse current interference signals and other interference signals generated by various transient high voltages, judges whether short-circuit fault to the ground occurs or not, and positions of fault points.
2. The device for sampling the fault current of the hybrid line of the overhead cable according to claim 1, wherein the main control module further compares the ground current or the load current value at the two ends of the cable section of the hybrid transmission line with a set current sampling threshold value, records the sampling time when the ground current or the load current value at the two ends of the cable section of the hybrid transmission line exceeds the set current sampling threshold value, and uploads the ground current or the load current data at the two ends of the cable section of the hybrid transmission line in a set time period before and after the sampling time to the remote monitoring platform through the wireless communication module.
3. the device for sampling the fault current of the hybrid line of the overhead cable according to claim 1, wherein the main control module further uploads the temperature data at two ends of the cable section of the hybrid transmission line to the remote monitoring platform in real time through the wireless communication module according to a set temperature parameter uploading period.
4. The cable overhead line hybrid line fault current sampling device of claim 1, further comprising an alarm indicator light connected to the master control module.
5. The cable overhead line hybrid line fault current sampling device of claim 1, wherein the master control module comprises a microcontroller and the current sampling module comprises a current sampling chip; the temperature sampling module comprises a temperature sampling chip.
6. The cable overhead line hybrid line fault current sampling device of claim 1, wherein the clock synchronization module comprises a Beidou time service navigation module.
7. The device for sampling the fault current of the hybrid line of the overhead cable according to claim 1, wherein the wireless communication module comprises one or more of an RS485 serial port module, an industrial Ethernet communication module or a 4G wireless communication module.
8. An on-line monitoring system for the fault of a cable overhead line hybrid line is characterized by comprising the cable overhead line hybrid line fault current sampling device, a wireless communication base station, a front-end server, a remote monitoring platform and an intelligent terminal, wherein the cable overhead line hybrid line fault current sampling device is in data interaction with the front-end server, the remote monitoring platform and the intelligent terminal through the wireless communication base station.
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| CN111463902A (en) * | 2020-04-10 | 2020-07-28 | 中国神华能源股份有限公司神朔铁路分公司 | Overhead line monitoring method, system, device and server |
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| CN112147400A (en) * | 2020-09-27 | 2020-12-29 | 郑州中聖电子科技有限公司 | Accurate cable load acquisition device and method |
| CN112486009A (en) * | 2020-11-20 | 2021-03-12 | 山东山大电力技术股份有限公司 | Time service signal abnormal waveform recording analyzer and method |
| CN113566903A (en) * | 2021-09-28 | 2021-10-29 | 山东科华电力技术有限公司 | Distributed cable comprehensive online monitoring device and method |
| CN113702690A (en) * | 2021-08-23 | 2021-11-26 | 国网吉林省电力有限公司白城供电公司 | Lightning current monitoring method for transmission tower |
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| CN113702690A (en) * | 2021-08-23 | 2021-11-26 | 国网吉林省电力有限公司白城供电公司 | Lightning current monitoring method for transmission tower |
| CN113566903A (en) * | 2021-09-28 | 2021-10-29 | 山东科华电力技术有限公司 | Distributed cable comprehensive online monitoring device and method |
| CN113566903B (en) * | 2021-09-28 | 2022-02-22 | 山东科华电力技术有限公司 | Distributed cable comprehensive online monitoring device and method |
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