WO2019190170A1 - Device and method for detecting high-voltage power distribution line path having improved stability - Google Patents
Device and method for detecting high-voltage power distribution line path having improved stability Download PDFInfo
- Publication number
- WO2019190170A1 WO2019190170A1 PCT/KR2019/003507 KR2019003507W WO2019190170A1 WO 2019190170 A1 WO2019190170 A1 WO 2019190170A1 KR 2019003507 W KR2019003507 W KR 2019003507W WO 2019190170 A1 WO2019190170 A1 WO 2019190170A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- current
- voltage power
- power line
- pulse signal
- Prior art date
Links
Images
Classifications
-
- 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
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
-
- 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
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/11—Locating faults in cables, transmission lines, or networks using pulse reflection methods
Definitions
- the present disclosure relates to the field of power, and more particularly, to an apparatus and method for exploring a path of a high voltage power line based on a magnetic field signal generated from a high voltage power line in response to a current signal generated at a low voltage terminal of a distribution transformer.
- an impulse current signal has been used to track the power line embedded in the ground or in the water, or concealed in a customer's building, etc. to determine the construction of the installation path or branch line.
- Korean Patent No. 10-0396043 Metal and apparatus for detecting and identifying an electric cable
- Korean Patent No. 10-0752694 Underground power cable and underground line detection method using the same
- Republic of Korea Patent No. 10-0947848 High voltage and low voltage power line path and line detection method and apparatus capable of measuring the low voltage power line quality
- the present disclosure has been made in response to the above-described background art, and is to provide an apparatus and method for high voltage power line path exploration with improved stability.
- an apparatus for improving stability of a high voltage power line path is disclosed.
- the high-voltage power line path detection device is connected to the primary winding of the power distribution transformer for converting the high voltage of the power distribution to the low voltage in proportion to the ratio of the winding combination to track the high voltage power line supplying the voltage and current to the final power supply of the distribution system.
- the probe current generator is connected to the secondary winding of the distribution transformer for generating a current pulse signal inversely proportional to the winding ratio to detect the magnetic field signal around the high-voltage power line, the current In order to improve the reception performance of the buried path probe and the buried path probe to detect the buried path and the connection configuration of the high voltage power line by detecting a magnetic field signal generated in the vicinity when a pulse signal flows on the high voltage power line, Reverse direction to suppress the occurrence of reverse magnetic field generated by external conductor It may include a current limiter.
- the exploration current generator may generate a current pulse signal by intermitting the current flowing in the diode and the electrical load connected in series with the first conductor to be explored among one or more conductors connected to both ends of the secondary winding of the distribution transformer.
- the buried path probe, the magnetic field sensor, the magnetic field sensor which is located perpendicular to the buried direction of the high-voltage power line receives a magnetic field signal corresponding to the generation time of the current pulse signal generated from the probe current generator
- a band filter for band-filtering a magnetic field signal received by the signal to remove a load current and an out-of-band signal, a signal amplifier for amplifying a signal passing through the band filter, an ADC for converting an analog signal through the signal amplifier into a digital signal
- a signal detection time management unit for detecting a signal corresponding to a generation time of a pulse signal with the digital signal converted by the ADC, and a pulse for providing generation time and period information of a pulse signal stored in the signal detection time management unit to the signal detection time management unit Whether the signal passed through the signal information storage unit and the signal detection time management unit It may include a pulse signal determination unit for determining and a pulse signal magnitude display unit for displaying the pulse signal information passing through the pulse signal determination unit.
- the reverse current limiter is coupled to a specific frequency of the pulse current to control the conductive noise flowing through the outer conductor of the high voltage power line and finally minimize the influence of the signal radiated by the forward pulse current. It has a combination structure of one or more cylindrical separation type ferrite core (Feerrite core) having a characteristic that can occur can be installed without separation of the outer conductor.
- Feerrite core cylindrical separation type ferrite core
- the signal information of the current pulse signal generated from the probe current generator and the signal of the current pulse signal which is the basis of the magnetic field signal measured from the buried path probe. It may further include a network module for transmitting and receiving information.
- the probe current generator may include a voltage riser which is a combination of a snubber, a limiter, and inductor chokes for controlling the voltage rise when the switching element is operated. It may further include.
- the buried path probe may receive a magnetic field signal through the magnetic field sensor and store pulse signal generation time and period information in the pulse signal information storage unit, without passing through a network module in proximity to the probe current generator. It may be characterized by.
- a method for improving stability of high voltage power line path includes generating a current pulse signal inversely proportional to the turns ratio so as to detect a magnetic field signal around a high voltage power line through a probe current generator connected to a secondary winding of a distribution transformer and the current pulse generated by the probe current generator. Determining a buried path and a connection configuration of the high voltage power line through a buried path probe for detecting a magnetic field signal generated in response to the signal; and surrounding the high voltage power line through a probe current generator connected to the secondary winding of the distribution transformer.
- Generating a current pulse signal inversely proportional to the turns ratio to detect the magnetic field signal at may include supplying a bipolar voltage prior to generating the current pulse signal to control the pulse generation operation of the switching element. .
- the present disclosure can provide an apparatus and method for safely exploring a buried path of a high-voltage power line having improved stability in a live operation state.
- 1 is a structure of a general low voltage power line.
- 2 is a structure of a high voltage power line having an outer conductor.
- FIG. 4 is a view showing a state in which the external conductors of the three-phase high-voltage power line is commonly connected and grounded in the field.
- FIG. 7 is an exemplary view illustrating a configuration for connecting and detecting a signal generator to a power source in a load connected through a low voltage cable in the prior art.
- FIG. 8 shows the shape of a waveform generated in the configuration of the above-described [7].
- FIG 9 illustrates a configuration of a high voltage power line exploration apparatus according to an embodiment of the present disclosure.
- FIG. 10 shows generation of a current pulse signal in comparison with [FIG. 7] according to an embodiment of the present disclosure, that is, at a position closest to the distribution transformer and not to the load side after the low voltage line.
- FIG. 11 illustrates a configuration of an exploration current generator according to an embodiment of the present disclosure.
- FIG. 12 illustrates an entire structure of a distribution system according to an embodiment of the present disclosure.
- FIG. 13 illustrates a power supply Vge for operating a switch of the probe current generator and a position for measuring voltage Vce when a current pulse signal is generated by the switch operation.
- FIG. 14 shows a relationship waveform between Vge and Vce when generating a current pulse signal in the previous technique.
- FIG. 15 shows an enlarged waveform of FIG. 14.
- Fig. 16 shows a comparison of waveforms before and after Vge is inhibited.
- FIG 17 illustrates a circuit for limiting the rise of the commercial voltage when a current pulse signal is generated according to an embodiment of the present disclosure.
- FIG. 18 illustrates a result of measuring a voltage of Vce when a voltage rise limiting unit including a snubber, a voltage limiter, and an inductor choke is added to the probe current generator as shown in FIG. 17.
- FIG. 19 illustrates generation times and periods of a current pulse signal according to an embodiment of the present disclosure.
- FIG. 20 is a diagram exemplarily illustrating a comprehensive structure of an exploration current generator according to an exemplary embodiment of the present disclosure.
- FIG. 21 is a diagram exemplarily illustrating a process of exploring a high voltage power line through a current detection signal of an exploration current generator according to an embodiment of the present disclosure.
- FIG. 22 shows the form of a ferrite core separated in a reverse voltage current limiter.
- FIG. 23 shows the result of the reverse voltage limiter measuring the change in magnitude of the reverse feedback current pulse signal according to the change in the number of ferrite cores.
- 24 is a view for explaining a method of improving the exploration sensitivity by installing a reverse current limiter on the high voltage power line to be probed and one nearby high voltage power line to minimize the magnitude of the reverse power current pulse signal to the power cable to be detected and the vicinity.
- FIG. 25 is a diagram for describing a decrease in loss of a current pulse signal when limiting a return current to an external target to be probed according to an exemplary embodiment of the present disclosure.
- FIG. 26 illustrates a state in which an actual ferrite core is installed on an outer conductor of a high voltage power line to be probed according to an embodiment of the present disclosure.
- FIG. 27 is a flowchart illustrating an operation step for exploring a high voltage power line path according to an embodiment of the present disclosure.
- buried paths or branch connection configurations can be identified using pulsed current signals by tracing power lines that are buried underground, underwater, or concealed in customer buildings. Specifically, a plurality of current pulses may be generated at a very short time between the merchant line and the midline of the low voltage power line, and the magnetic field signals generated in response to the corresponding current pulse signals in the low voltage power line and the high voltage power line may be traced. The connection history between power devices can be identified.
- the low voltage power line and the high voltage power line may be configured in different structures. More specifically, as shown in FIG. 1, the low voltage power line 100 used in the low voltage system has a simple structure including a conductor 101 and an insulator 102 surrounding the conductor. On the other hand, as shown in FIG.
- the high voltage power lines 200 and 300 used in the high voltage system include the conductors 201 and 301, the inner semiconducting layers 202 and 302, the insulators 203 and 303, and the outer semiconducting layer ( 204, 304, external conductors 205 and 305, and external insulators 206 and 306, and a uniform electric field is formed on the surface of the insulators 203 and 303 surrounding the high voltage charged conductors 201 and 301.
- the outer conductors 205 and 305 having a separate shielding function are separately provided outside the cable to ground them.
- the high voltage power lines 200 and 300 may be classified according to the type of the outer conductors 205 and 305 provided outside the power line. Specifically, the high voltage power lines 200 and 300 may be divided into a CV cable 200 in which an outer conductor located outside the power line having a shielding function is a copper tape 205 having a relatively small current capacity in a neutral wire ungrounded operation system. In addition, the neutral cable may be divided into a CNCV cable 300 having an interlocking line 305 so that a current such as a fault current flows in the ground operation system.
- the high-voltage power line has an external conductor having a shielding function in addition to the conductor for transmitting power to provide a method for distinguishing the buried path and connection configuration (line) of the high-voltage power line configured to achieve an electric field balance exist.
- FIG. 3 illustrates a method of exploring a buried path of a power line when the power line is in a live operation state in the prior art.
- the conductor 311 of the high-voltage power line is charged to a high voltage (that is, supplying power) and is in live operation
- the connection with the ground (314, 315) across the power line is performed.
- One end of the external conductor 310 may be directly connected 312 to the transmitter 313 or inductively coupled 319 through an inductance coil.
- the probe signal output from the transmitter connected to one side end of the outer conductor 310 is received by the receiver 318 through the clamp 317 provided on the other side end (that is, the opposite side to one side to which the transmitter is connected) (316).
- the prior art describes a method and apparatus for determining a connection configuration of a high voltage power line by receiving a corresponding probe signal.
- the power line is installed, it is used as a combination of three high voltage power lines to transmit three-phase electric power instead of single phase.
- FIG. 4 is a view showing a state in which the external conductor is grounded after the common connection when three high-voltage power lines are combined to supply three-phase power in the field.
- three external conductors 305 included in each of the three-phase high voltage power lines 300 are commonly connected 307 and grounded 314.
- each high voltage is used to connect a transmitter and a receiver (i.e., a clamp) to both ends of each outer conductor at each exploration in order to realize the prior art. It may be inefficient to cut and / or disconnect the outer conductor 305 of the power line and reconnect to restore it after the exploration is complete.
- the high voltage power line is charged with a high voltage in a live state, when the external conductor ground 314 of the high voltage power line is cut and / or disconnected, a high voltage may occur due to a fault current, which may cause a serious safety accident.
- the prior art includes a power line in which a separate probe wire 120 is added to a high voltage cable 110 to be explored in a three-phase high voltage power line 100 configuration, and a detector 210.
- the high voltage power line can be detected by connecting both terminals 123 and 116 to the conductor 121 of the probe wire 120 of the corresponding power line and the external conductors of the high voltage line, respectively.
- such a cable is not actually installed in the field, and it is difficult to replace an existing high voltage cable with a cable to which an exploration wire is added as in the prior art, and thus it is not used.
- the prior art connects the transmitter 401 to the conductor after making the conductor 301 of the high voltage cable 300 normally operated by being charged with high voltage (ie, diagonally).
- the discovery signal can be transmitted 404.
- the prior art can form a loop 405 by connecting the conductor 301 and the outer conductor 305 on the opposite side of the transmitter to form a circuit that the search signal is returned, the high-voltage cable through the magnetic field coil 403 (300 (A), 300 (B), 300 (C)) wound around the circumferential surface of the detection signal transmitted from the transmitter 401 using the receiver 402 (409) to distinguish the high-voltage cable Explaining.
- the loop 405 causes a current pulse signal having a magnitude of 60 (i.e., 60% (406)) to flow back to the outer conductor 305 (A), and the conductors 301 (B) and 301 on the other two phases.
- a current pulse signal having a magnitude of 20 ie, 20% (407, 408) is fed back to the outer conductors 305 (B) and 305 (C) surrounding (C)).
- the detection signal 404 having a magnitude of 100 transmitted from the transmitter and the detection signal having a magnitude of 60 flowing back to the outer conductor 305A by the loop 405 flow in opposite directions to each other. Liver offset occurs. That is, the detection signal 409 having a magnitude of 40 is canceled by a signal having a magnitude of 100 transmitted from the transmitter 401 by a signal (ie, a signal having a magnitude of 60) returned through the external conductor 305A. ) Can only be detected around the cable in the form of a magnetic field signal.
- the cable of the other two phases does not have a forward signal (i.e., the direction in which the transmitter transmits the probe signal), but a signal having a magnitude of 20 in the reverse direction (i.e., the direction in which the signal is returned by the loop) has an external conductor.
- a forward signal i.e., the direction in which the transmitter transmits the probe signal
- a signal having a magnitude of 20 in the reverse direction i.e., the direction in which the signal is returned by the loop
- the signals 410 and 411 having a magnitude of 20 in the reverse direction may be detected by the receiver.
- Another conventional technique is to transmit an exploration current pulse signal at a load of a low voltage power line such as a home or a shopping mall, and to detect it at a high voltage and a low voltage power line.
- the related art can generate a signal for high low voltage exploration and a current pulse group having a holding time of 200 ⁇ s by connecting to a power distribution transformer power supply at a load side of a low voltage line for distribution. have.
- the current pulse group generated from the signal generator it is possible to measure the quality of the low voltage power line by changing the arc voltage waveform in the low voltage power line.
- a group of current pulses generated from a signal generator connected to the load side of the low voltage power line may be converted into a primary current through a transformer.
- the current pulse group passing through the low voltage power line is converted into a current pulse reduced by a certain ratio according to the transformer ratio of the transformer and flows to the high voltage power line, and the high voltage power line can be detected by detecting the converted current pulse.
- the current pulse signal when the current pulse signal is generated on the load side after passing through the low voltage power line, the arc signal generated at the defective location is detected on the load side according to the poor connection of the low voltage power line, so that the quality of the low voltage power line can be measured.
- the current pulse signal due to the line constant of the low voltage power line or the like, the current pulse signal may distort the waveform and reach the transformer on the power supply side of the low voltage line.
- the distorted waveform does not maintain the characteristics of the occurrence time and hold time of the square wave current pulse, but has a curved shape, and the magnitude of the current is 1/60 when the current pulse signal is converted from the transformer to the primary current. Can be reduced and again reduced by the reverse current returned through the outer conductor of the high voltage power line.
- the current pulse signal when a signal generator connected to the load side of the low voltage power line generates a 500 A current pulse signal, the current pulse signal whose waveform is distorted by the influence of the low voltage line when reaching the transformer has a current ratio of 220 V / 13,200. Inductively coupled with the primary winding of the transformer having V) can be converted into a current pulse signal having a magnitude of about 8A (500/60). That is, a current pulse having a size of 8 A flows through the high voltage power line by the transformer.
- the current pulse flowing through the transformer through the transformer is canceled (ie, 60% cancelled) by the feedback current, which corresponds to 40% of the magnetic field.
- the signal is detected around the high voltage power line. That is, a current pulse signal having a size of 8 A is lost to the high voltage power line, and finally only a current pulse having a size of 3.2 A can be converted into a magnetic field signal for detecting the high voltage power line and detected as an exploration signal.
- the large current detection signal is influenced by the line constant of the low voltage line to generate a pulse.
- the current pulse signal is transformed into a current pulse having no holding time characteristic to reach the distribution transformer, and the current pulse signal of the waveform distorted by the current ratio is reduced to the size of 1/60 and converted into a high voltage current, If only 40% is utilized due to the reverse feedback current flowing in the outer conductor of the high-voltage power line, there is a problem that it is indistinguishable from the ambient noise and the load current.
- the waveform distortion of the current pulse signal is minimized in the live state even in the three-phase high voltage cable installation place, not single phase, and the external conductors of the high voltage power line are not connected to the grounded environment, so the distortion and signal loss of the current pulse signal are lost.
- the present disclosure provides an exploration current generator (i.e., an exploration current generation module) in close proximity to the distribution transformer so that the waveform of the exploration current signal can be maintained to reach the winding of the distribution transformer. Can be.
- an exploration current generator i.e., an exploration current generation module
- the waveform of the exploration current signal can be maintained to reach the winding of the distribution transformer. Can be.
- the high-voltage power line path sensing device 10 of the present disclosure includes an exploration current generator 20, a buried path detector 30, and a reverse current limiter for generating a current pulse signal for detecting the high voltage power line 13 as shown in FIG. 9. 40 may include.
- the exploration current generator 20 is different from the previous technology. The configuration of exploration with the nearest installation is explained.
- the probe current generator 20 includes a power supply terminal 21 connected to a low voltage power line to be measured, a diode 22 for half-wave rectifying an input voltage, and a switching device for generating a current pulse. (IGBT), an operation suppressing unit 23 which suppresses the operation of the switching element, and a current generating time control unit 24 which receives a current pulse from a DSP, which is a main processing device, and converts it into an IGBT gate signal for transmission to the IGBT. ), An arithmetic unit 25 composed of a DSP processor and an external interface, an electrical load 26 that limits the current generated by the switching element operation, and a current that detects a zero crossing trigger signal and calculates a current pulse generation time.
- the buried path detector and the network module 31 for synchronizing the current pulse generation time information For measuring the voltage measurement unit 30, the buried path detector and the network module 31 for synchronizing the current pulse generation time information, the touch LCD display 32 for operating the probe current generator, and for supplying the bipolar voltage power.
- the power supply 33 is comprised.
- the above components are exemplary, and the scope of the present disclosure is not limited to the above components. That is, additional components may be included or some of the aforementioned components may be omitted, depending on implementation aspects of the embodiments of the present disclosure.
- the probe current generator 20 needs a reference point for generating the current pulse signal at a precise time in synchronization with a power frequency of 50 or 60 Hz to generate the current pulse.
- the current pulse generation time calculation unit provides a trigger signal that can continuously provide the current pulse generation time information to the DSP by calculating the current pulse generation time by calculating the current pulse generation time as a reference point when the power voltage falls among the zero crossing points.
- the switching device (1200V 400A IGBT * 2) can be precisely operated at the desired time to control the magnitude and duration of the current pulse.
- the exploration current generator 20 of the high-voltage power line path exploration device 10 is directly connected to the low voltage stage 21 of the distribution transformer, as shown in FIGS. 9 and 10. It may be provided.
- the capacitance of the low voltage line is ignored and only the sensing current generating switching element (IGBT) is connected in series with the reactance coil of the transformer. This can be interpreted as generating a current pulse signal. That is, the current pulse signal is directly connected to the winding of the inductive coupling circuit of the transformer without being affected by the low voltage line constant so that the current pulse signal can be converted into a high voltage.
- Directly connecting the exploration current generator to the low voltage terminal of the distribution transformer of the present disclosure is only one example, and the present disclosure is not limited thereto.
- the high-voltage power line path exploration apparatus of the present disclosure is located near the high-voltage power line through the buried path probe 30 along the power from the distribution transformer 12 to the secondary power station LS 11 secondary.
- the embedding position of the high voltage power line 13 and the connection configuration at each branch point can be explored.
- FIG. 13 illustrates measurement points of Vce and Vge, which are voltages around the probe current generator switching element IGBT, in the present disclosure.
- Vge which is a voltage for operating the switching element IGBT, and the magnitude of the voltage are changed to explain the voltage Vce across the power supply terminal when the switching element is operated.
- malfunction of the switching element of the exploration current generator 20 may occur due to the reaction of the reactance of the transformer.
- FIG. 14 is a view showing a change in the AC sine wave voltage waveform 52 generated when the current switching 51 at a high speed of a power source having a large reactance component such as a transformer.
- a current pulse is generated (i.e. switched on) by a switching element of an exploration current generating module connected to the low voltage stage of the transformer, and a current pulse signal flows through the transformer, the voltage decreases instantaneously, but If the current pulse is to be interrupted (i.e. switched off), overvoltage may occur due to the reaction of the reactance of the transformer.
- the power supply voltage Vce
- Vge voltage between the gate and emitter
- the switching element may malfunction and be turned off.
- the Vce voltage rapidly rises 52A due to the voltage rise, and at the same time, the Vge may be raised to effect the switching element to be turned on.
- the exploration current generator 20 including an element that switches to a load having a low power resistance value to generate a current pulse signal requires measures to prevent a malfunction when operating in close proximity to a transformer having an inductance component. Done.
- the exploration current generator 20 generating a current pulse signal adjacent to a transformer receives a power from a low voltage line of another phase and supplies a DC power supply to control the operation of the switching element through a bipolar voltage. It may include wealth.
- a voltage of Vge of more than (+) 10 V is applied to operate the switching element on, and when the switch is off, the method of removing the (+) voltage is used.
- the switch-off voltage is kept below (-) 10V so that even if the Vce voltage rises, the negative voltage is supplied to minimize the influence.
- the DC power supply unit SMPS of the exploration current generator connects the power of a phase other than the target of the three-phase power supply of the distribution transformer to the conductor 1.
- the suppression function is prevented from malfunctioning due to the influence between terminals of the switching element even if the voltage fluctuates due to the load connected to the distribution transformer or the operation of the switch element. Take measures to generate a current pulse signal.
- a probe current generator includes a snubber, a voltage limiter, and an inductor for controlling the voltage rising momentarily during operation of the switching element, in particular, off. It may include a voltage rise limiting portion including a combination or part of an inductor choke.
- FIG. 18 illustrates a result of measuring a voltage of a rising Vce when the high voltage power line path detecting apparatus of the present disclosure is configured to include a voltage rise limiter that combines a snubber, a voltage limiter, and an inductor choke. It is possible to minimize the instantaneous rise of the Vce voltage when switching off.
- the pulse holding time was increased from 200us to 1,800us (1.8ms) to minimize distortion of the current pulse waveform.
- the interval was 2 cycles (33.3ms) to minimize the influence of the residual pulses so that the overcharge is not generated by combining between the residual charge voltage and the generated pulse voltage.
- the instantaneous Vce voltage increase is minimized through the voltage increase limiting part using a snubber or the like.
- the pulse current is maintained and the interval between generations is prevented to prevent the influence of reverse voltage, so that even if a large current pulse signal is generated at the low voltage stage of the distribution transformer to detect the high voltage cable, the detection is safely performed without affecting the existing power equipment. Considered to be possible.
- the detection current generator 20 of the high-voltage power line path detecting device may detect a function abnormality early by measuring a pulse signal current and a rising voltage fluctuation during the switching operation, and constantly sensing the temperature of the surface of the switching element.
- the measurement results can be generated and recognized through the touch LCD display, such as an alarm.
- the probe current generator 20 can be adjusted through the touch LCD display to generate a probe current pulse signal at 20% of the load flowing through the high-voltage power line 13 so that it can be stably adjusted to suit the site conditions. Can explore.
- the high-voltage power line path probe 10 may include a network module 31 for connecting communication between the probe current generator 20 and the buried path probe 30.
- the signal information of the current pulse signal generated from the probe current generator 20 through the network module 31 and the signal information of the magnetic field signal generated in response to the current pulse signal measured from the buried path probe 30 is synchronized Can be.
- the signal information may include information about at least one of a current pulse signal and a time and a period of the magnetic field signal generated corresponding to the pulse signal.
- the probe current generator 20 may transmit the transformer and phase information to the line probe module along with the pulse current signal at a predetermined time interval with a zero crossing point on the low voltage power line. Accordingly, the buried path probe 30 receives the current pulse signal and the magnetic field signal generated by the high voltage power line 13 in response to the current pulse signal through the transformer and phase information received from the probe current generation module and the corresponding pulse current signal. Time and period can be synchronized.
- the high voltage power line path probe 10 may be configured to synchronize a signal generated by each of the probe current generator 20 and the buried path probe 30 through the network module 31.
- the buried path probe 30 may detect the field magnetic field signal at the secondary or primary side of the distribution transformer 12 without storing information, thereby storing the generation time and period.
- 21 is a diagram exemplarily illustrating a process of exploring a high voltage power line through an exploration current generation module according to an embodiment of the present disclosure.
- the current pulse signal is the current ratio of the transformer (1 / 60 may be converted into a current pulse signal attenuated by 1/60 and may flow to the high voltage power line 13.
- the current pulse signal flowing in the upper line of the high-voltage power line 13 is divided into three different paths through the outer conductor (concentric neutral line) and returned to the substation direction.
- the problem with the previous technology is that as described above, since the external conductors are grounded after three common connections, only about 40% of the probe current pulse signal is detected as the probe signal when 8A is transmitted (for example, 500A low voltage probe). When generating a current, only a current pulse signal having a size of 3.2 A was detected), resulting in low efficiency (0.64%), which inevitably lowered the accuracy of high-voltage power line path detection.
- the high-voltage power line path exploration apparatus 10 of the present disclosure restricts the classification effect in which the current pulse signal flowing through the midline is divided into 1/3 according to the three-phase power lines, thereby limiting the classification effect (that is, the current pulse signal flowing in the forward direction).
- a reverse current limiter composed of one or more ferrite cores may be provided on the outer conductor (concentric neutral) of the power line to be probed. Accordingly, the reverse current pulse signal returned to the power line to be detected can be cut off, and the magnetic field signal generated by the forward current pulse signal can be detected without loss to the desired power line among the multi-configured neutral lines, thereby improving the detection accuracy. have.
- the ferrite core used in the reverse current limiter limits the conducted noise such as the pulse current flowing to the outer conductor, and ultimately radiates noise emitted directly around the high voltage power line by the forward pulse current flow. Radiated emission may be to be removed. That is, the ferrite core blocks a signal having a high frequency component that changes momentarily, such as a current pulse signal, while not affecting a voltage signal of a low frequency such as a general power frequency.
- the magnitude of the blocking current may increase according to the quantity of ferrite cores, and does not affect the quantity.
- the ferrite core has a two U-shape and can be separated as shown in FIG. 22 to limit the unnecessary reverse current by surrounding the surroundings without cutting the outer conductor in the field.
- FIG. 23 shows the result of measuring the magnitude change of the current pulse signal returned in the reverse direction according to the number provided with the ferrite core.
- a reverse current may flow 20A.
- 11A reduced by about 50% flows, and when 5 units are installed, 8A reduced by 60% flows, and eight When installed, you can see that 5A flows reduced by 75%. That is, it can be seen that as the number of ferrite cores is increased, the magnitude of the current pulse signal fed back is decreased.
- FIG. 24 illustrates a method of improving the sensing sensitivity by installing a ferrite core on the high voltage power line to which the current pulse signal flows and one of the high voltage lines nearby to minimize the size of the reverse power current pulse signal near the power cable and the area to be probed. have.
- a signal of a current pulse having a magnitude of 45 which corresponds to 75% of a signal of a current pulse having a magnitude of 60, is cut off, so that only a current pulse signal having a magnitude of 15 flows into the return current, so that A current pulse signal having a magnitude of 85 flows through the power line, and a path of the high voltage power line can be detected through a magnetic field signal generated in response to the current pulse signal having a magnitude of 85.
- the current pulse signal is attenuated by 1/60 through the transformer's current ratio (1/60). It can be converted into a pulse signal and flow on a high voltage power line.
- 3.2A which is 40% of 8A, may flow in the high-voltage power line to be explored.
- 75% of the 60% of the current returned in the reverse direction may be blocked.
- the current pulse signal can flow in the desired direction, and the cancellation phenomenon with the current pulse signal returned in the reverse direction can be prevented. Accordingly, the detection efficiency of the signal for exploring the path of the high-voltage power line can be improved, and the current pulse signal can be adjusted to flow through the neutral line in the required direction among the various paths, so that the exploration without additional manipulation of the reserve power line can be performed. May be possible.
- FIG. 25 shows a state in which a plurality of ferrite coils are installed on an outer conductor of a high voltage cable to be explored.
- 26 illustrates the structure of the buried path exploration apparatus.
- the current pulse magnetic field sensor is a type of antenna wrapped around a rod-shaped balloon with a coil winding to receive a pulsed magnetic field signal emitted from a high voltage power line.
- the band pass filter can block the high frequency band at the same time as the magnetic field signal generated by the power frequency load current, which occupies a large portion of the magnetic field signal, so as to filter only the magnetic field signal generated by the pulse current signal generated by the probe signal generator.
- the signal amplifier amplifies the analog signal passing through the band pass filter.
- the ADC converts the analog signal to digital.
- the signal detection time manager may filter only signals input during the corresponding time and period according to the pulse signal generation time and period information provided by the pulse signal information formal unit.
- the pulse signal information storage unit stores signal characteristics such as generation time, holding time, and period of the current pulse signal and provides them to the signal detection time management unit.
- the pulse signal authenticity determination unit analyzes the code value of the signal passed through the signal detection time management unit to determine the authenticity.
- the pulse signal magnitude display portion displays the magnitude and polarity of the pulse signal that has passed the authenticity determination by the pulse signal authenticity determination portion.
- the network module may be connected to the probe signal generator to perform a function of receiving signal generation information.
- FIG. 27 is a flowchart exemplarily illustrating a procedure for exploring a high voltage power line path according to an embodiment of the present disclosure.
- the method for searching the path of the high voltage power line may be performed through the following steps.
- the grasp may include the step of completing the work by marking the grasping results on site and drawing up the drawings.
- FIG. 27 may be changed in order, and at least one or more steps may be omitted or added.
- the above-described steps are only embodiments of the present disclosure, and the scope of the present disclosure is not limited thereto.
- the high-voltage power line path detecting apparatus of the present disclosure transmits a current pulse to a predetermined signal standard, detects a magnetic field signal generated in response to the current pulse signal on the high-voltage power line, and is connected to the same distribution system during operation.
- the operating status of the in-power equipment, the path of the high-voltage power line, etc. can be grasped without using a separate line.
- the present disclosure is to provide an exploration device with improved stability in the path detection of high-voltage power line.
Abstract
Description
Claims (8)
- 배전용 고전압을 권선 조합의 비율에 비례하여 저전압으로 변환하는 배전용 변압기의 1차 권선에 연결되어 전압 및 전류를 공급하는 고압 전력선을 추적하여 배전계통의 최종전원까지 매설경로 및 연결 구성을 파악하기 위한 탐사 장치에 있어서,Understand the buried path and connection configuration to the final power supply of the distribution system by tracing the high-voltage power line connected to the primary winding of the distribution transformer that converts the high voltage for distribution to low voltage in proportion to the ratio of the winding combination. In the exploration device for상기 배전용 변압기의 2차 권선에 연결되어 상기 고압 전력선의 주변에서 자계신호를 검출할 수 있도록 권선비에 역비례한 전류 펄스 신호를 발생시키는 탐사 전류 발생기;An exploration current generator connected to the secondary winding of the distribution transformer and generating a current pulse signal inversely proportional to the turns ratio so as to detect a magnetic field signal around the high voltage power line;상기 전류 펄스 신호가 상기 고압 전력선에 흐를 때 주변에서 발생하는 자계 신호를 검출하여 상기 고압 전력선의 매설 경로 및 연결 구성을 추적하는 매설 경로 탐사기; 및A buried path probe which detects a magnetic field signal generated in the vicinity when the current pulse signal flows on the high voltage power line and tracks the buried path and the connection configuration of the high voltage power line; And상기 매설 경로 탐사기의 수신 성능을 향상시키기 위해, 상기 고압 전력선의 외부도체에 의해 발생하는 역방향 자계의 발생을 억제하는 역방향 전류 제한기;A reverse current limiter which suppresses generation of a reverse magnetic field generated by an external conductor of the high voltage power line to improve reception performance of the buried path probe;를 포함하는,Including,안정도 향상된 고압 전력선 탐사장치.High voltage power line probe with improved stability.
- 제 1 항에 있어서,The method of claim 1,상기 탐사 전류 발생기는,The exploration current generator,상기 배전용 변압기의 2차 권선의 양단과 연결된 하나 이상의 도체 중 탐사하고자 하는 제 1 도체와 직렬 연결된 전기부하와 다이오드에 흐르는 전류를 단속하여 전류 펄스 신호를 발생시키는 스위칭부;Switching unit for generating a current pulse signal by intermittent the current flowing in the diode and the electrical load connected in series with the first conductor to be explored of one or more conductors connected to both ends of the secondary winding of the power distribution transformer;상기 하나 이상의 도체 중 제 1 도체를 제외한 다른 하나의 도체와 연결되어 상기 탐사 전류 발생기의 동작전원을 공급하는 전원 공급부;A power supply unit connected to one other than the first one of the one or more conductors to supply operating power of the exploration current generator;상기 스위칭부의 동작을 제어하는 전류펄스 발생 시간 제어부;A current pulse generation time control unit controlling an operation of the switching unit;상기 스위칭부의 동작 시간을 제어하는 전류펄스 발생 시간 계산부;A current pulse generation time calculator configured to control an operating time of the switching unit;상기 스위칭부의 양단 전압을 측정하는 전압측정부;A voltage measuring unit measuring a voltage at both ends of the switching unit;상기 스위칭부의 동작에 의해 흐르는 전류를 파악하는 전류측정부; 및A current measuring unit which grasps the current flowing by the operation of the switching unit; And상기 스위칭부의 표면 온도를 파악하는 온도측정부;A temperature measuring unit for grasping the surface temperature of the switching unit;를 포함하는 것을 특징으로 하는,Characterized in that it comprises a,안정도 향상된 고압 전력선 탐사장치.High voltage power line probe with improved stability.
- 제 1 항에 있어서,The method of claim 1,상기 매설 경로 탐사기는,The embedding path probe,상기 고압 전력선의 매설 방향과 수직으로 위치하여, 상기 탐사 전류 발생기로부터 발생된 상기 전류 펄스 신호의 발생 시간에 대응하는 자계 신호를 수신하는 자계센서;A magnetic field sensor positioned perpendicular to the buried direction of the high voltage power line and receiving a magnetic field signal corresponding to a generation time of the current pulse signal generated from the probe current generator;상기 자계센서가 수신하는 자계 신호를 대역 필터링하여 부하전류 및 대역외 신호를 제거하는 대역필터;A band pass filter for band-filtering the magnetic field signal received by the magnetic field sensor to remove the load current and the out-of-band signal;상기 대역 필터를 통과한 신호를 증폭시키는 신호증폭부;A signal amplifier for amplifying the signal passing through the band pass filter;상기 신호증폭부를 통과한 아날로그 신호를 디지털로 변환하는 ADC;An analog-to-digital converter for converting the analog signal passing through the signal amplifier into digital;상기 ADC에서 변환된 디지털 신호를 펄스 신호의 발생 시간에 대응하여 신호를 검출하는 신호 검출 시간 관리부;A signal detection time management unit for detecting a signal corresponding to a generation time of a pulse signal of the digital signal converted by the ADC;상기 신호 검출 시간 관리부에 저장된 펄스 신호의 발생 시간 및 주기정보를 상기 신호 검출 시간 관리부로 제공하는 펄스 신호 정보 저장부;A pulse signal information storage unit providing generation time and period information of the pulse signal stored in the signal detection time management unit to the signal detection time management unit;상기 신호 검출 시간 관리부를 통과한 신호의 진위 여부를 판정하는 펄스 신호 판정부; 및A pulse signal determination unit that determines the authenticity of the signal passing through the signal detection time management unit; And상기 펄스 신호 판정부를 통과한 펄스 신호 정보를 표시하는 펄스 신호 크기 표시부;A pulse signal magnitude display unit for displaying pulse signal information passing through the pulse signal determination unit;를 포함하는,Including,안정도 향상된 고압 전력선 탐사장치.High voltage power line probe with improved stability.
- 제 1 항에 있어서,The method of claim 1,상기 역방향 전류 제한기는,The reverse current limiter,상기 고압 전력선의 외부도체에 흐르는 전도성 잡음을 제어하여 최종적으로 정방향 펄스 전류에 의해 방사되는 신호의 영향을 최소화하기 위해 펄스 전류가 가지는 특정주파수에 공조되어 저항을 발생하는 특성을 가진 하나 이상의 원통 분리형 페라이트 코어(Ferrite core)의 조합 구조를 가져 상기 외부도체의 분리없이 설치 가능한 것을 특징으로 하는 One or more cylindrical separation type ferrites having a characteristic of generating resistance by coordinating at a specific frequency of the pulse current to control the conductive noise flowing through the outer conductor of the high voltage power line and finally minimize the influence of the signal radiated by the forward pulse current. It has a combination structure (Ferrite core) can be installed without separation of the outer conductor안정도 향상된 고압 전력선 탐사장치.High voltage power line probe with improved stability.
- 제 1 항에 있어서, The method of claim 1,상기 탐사 전류 발생기와 상기 매설 경로 탐사기 간의 통신을 연결하여 상기 탐사 전류 발생기로부터 발생된 전류 펄스 신호의 신호 정보와 상기 매설 경로 탐사기로부터 측정된 자계 신호의 기초가 되는 전류 펄스 신호의 신호 정보를 송신 및 수신하도록 하는 네트워크 모듈;Connecting the communication between the probe current generator and the buried path probe to transmit the signal information of the current pulse signal generated from the probe current generator and the signal information of the current pulse signal which is the basis of the magnetic field signal measured by the buried path probe; A network module to receive;을 더 포함하는,Including more;안정도 향상된 고압전력선 탐사장치.High voltage power line probe with improved stability.
- 제 2 항에 있어서,The method of claim 2,상기 탐사 전류 발생기는,The exploration current generator,스위칭 소자가 동작하는 경우, 전압이 상승하는 것을 제어하기 위한 스너버(Snubber), 전압제한기(Limiter) 및 인덕터 초크(Inductor chokes)의 조합인 전압 상승부를 더 포함하는, When the switching element is in operation, further comprising a voltage riser, which is a combination of a snubber, a voltage limiter, and inductor chokes to control the voltage rise,안정도 향상된 고압 전력선 경로 탐사 장치.High-voltage power line path probe with improved stability.
- 제 3 항에 있어서,The method of claim 3, wherein상기 매설 경로 탐사기는,The embedding path probe,상기 탐사 전류 발생기에 근접하여 네트워크 모듈을 통하지 않고, 상기 자계센서를 통해 자계 신호를 수신하여 펄스 신호 발생 시간 및 주기 정보를 상기 펄스 신호 정보 저장부에 저장하는 것을 특징으로 하는 Receiving a magnetic field signal through the magnetic field sensor in proximity to the probe current generator, and stores the pulse signal generation time and period information in the pulse signal information storage unit without receiving through the magnetic field sensor안정도 향상된 고압 전력선 경로 탐사 장치.High-voltage power line path probe with improved stability.
- 안정도 향상된 고압 전력선 경로 탐사 방법에 있어서, In the stability of the high-voltage power line path detection method,배전용 변압기의 2차 권선에 연결된 탐사 전류 발생기를 통해 고압 전력선 주변에서 자계 신호를 검출할 수 있도록 권선비에 역비례한 전류 펄스 신호를 발생시키는 단계; 및Generating a current pulse signal inversely proportional to the turns ratio so as to detect a magnetic field signal around the high voltage power line through an exploration current generator connected to the secondary winding of the distribution transformer; And상기 탐사 전류 발생기에서 발생시킨 전류 펄스 신호에 대응하여 발생한 자계 신호를 검출하는 매설 경로 탐사기를 통해 상기 고압 전력선의 매설 경로 및 연결 구성을 파악하는 단계;Identifying a buried path and a connection configuration of the high voltage power line through a buried path probe for detecting a magnetic field signal generated in response to a current pulse signal generated by the probe current generator;를 포함하고, 그리고Including, and배전용 변압기의 2차 권선에 연결된 탐사 전류 발생기를 통해 고압 전력선 주변에서 자계 신호를 검출할 수 있도록 권선비에 역비례한 전류 펄스 신호를 발생시키는 단계는,The step of generating a current pulse signal inversely proportional to the turns ratio to detect the magnetic field signal around the high-voltage power line through the probe current generator connected to the secondary winding of the distribution transformer,상기 전류 펄스 신호를 발생하기 이전에 양극성 전압을 공급하여 스위칭 소자의 펄스 발생 동작을 제어하는 단계;Controlling a pulse generating operation of a switching element by supplying a bipolar voltage before generating the current pulse signal;를 포함하는,Including,안정도 향상된 고압 전력선 경로 탐사 방법.Improved stability High-voltage power line path detection method.
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2019243131A AU2019243131B2 (en) | 2018-03-26 | 2019-03-26 | Device and method for detecting high-voltage power distribution line path having improved stability |
JP2020552015A JP2021516762A (en) | 2018-03-26 | 2019-03-26 | High-voltage power line path exploration device and method with improved stability {APPARATUS AND METHOD FOR TRACING A SHEATHED HIGH VOLTAGE CABLE WITH ENHANCED STABILITY} |
US17/041,296 US11435379B2 (en) | 2018-03-26 | 2019-03-26 | Device and method for detecting high-voltage power distribution line path having improved stability |
CN201980021956.0A CN111902727A (en) | 2018-03-26 | 2019-03-26 | High-voltage power line path detection device and method with improved stability |
CA3095262A CA3095262C (en) | 2018-03-26 | 2019-03-26 | Device and method for detecting high-voltage power distribution line path having improved stability |
EP19776033.3A EP3779480B1 (en) | 2018-03-26 | 2019-03-26 | Device and method for detecting high-voltage power distribution line path having improved stability |
Applications Claiming Priority (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR20180034180 | 2018-03-26 | ||
KR10-2018-0034180 | 2018-03-26 | ||
KR20180136898 | 2018-11-08 | ||
KR10-2018-0136898 | 2018-11-08 | ||
KR1020190034197A KR102181831B1 (en) | 2018-03-26 | 2019-03-26 | Safety enhanced apparatus and method for tracing the sheathed medium voltage cable |
KR10-2019-0034197 | 2019-03-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2019190170A1 true WO2019190170A1 (en) | 2019-10-03 |
Family
ID=68058423
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/KR2019/003507 WO2019190170A1 (en) | 2018-03-26 | 2019-03-26 | Device and method for detecting high-voltage power distribution line path having improved stability |
Country Status (1)
Country | Link |
---|---|
WO (1) | WO2019190170A1 (en) |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100396043B1 (en) | 1993-06-21 | 2003-11-01 | 아소시아시옹 앵떼르프로페시온느 드 프랑스 뿌르 라 프레뱅션데악시당스에드렝상디 | Method and apparatus for detecting and identifying electrical cables |
KR100752694B1 (en) | 2006-05-10 | 2007-08-29 | 김호광 | Underground power cable |
KR100778089B1 (en) * | 2007-03-27 | 2007-11-20 | 이현창 | System and method for acquiring underground lv networks configured with plural transformers in the urban area |
KR100947848B1 (en) | 2008-10-22 | 2010-03-18 | 이현창 | The apparatus and method to measure the quality of low volatge service cable to the customers while tracing and identification of medium and low voltage power cable |
KR20130101790A (en) * | 2012-03-06 | 2013-09-16 | 이현창 | Installation route survey |
JP2013217839A (en) * | 2012-04-11 | 2013-10-24 | Tokyo Electric Power Co Inc:The | Ground fault point detection device and ground fault point detection method |
KR101559533B1 (en) * | 2013-11-19 | 2015-10-15 | 이현창 | Mobile Apparatus And Method For Locating Earth Leaking Point |
JP2018031718A (en) * | 2016-08-26 | 2018-03-01 | 関西電力株式会社 | Overhead distribution system survey system and overhead distribution system survey method |
-
2019
- 2019-03-26 WO PCT/KR2019/003507 patent/WO2019190170A1/en unknown
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100396043B1 (en) | 1993-06-21 | 2003-11-01 | 아소시아시옹 앵떼르프로페시온느 드 프랑스 뿌르 라 프레뱅션데악시당스에드렝상디 | Method and apparatus for detecting and identifying electrical cables |
KR100752694B1 (en) | 2006-05-10 | 2007-08-29 | 김호광 | Underground power cable |
KR100778089B1 (en) * | 2007-03-27 | 2007-11-20 | 이현창 | System and method for acquiring underground lv networks configured with plural transformers in the urban area |
KR100947848B1 (en) | 2008-10-22 | 2010-03-18 | 이현창 | The apparatus and method to measure the quality of low volatge service cable to the customers while tracing and identification of medium and low voltage power cable |
KR20130101790A (en) * | 2012-03-06 | 2013-09-16 | 이현창 | Installation route survey |
JP2013217839A (en) * | 2012-04-11 | 2013-10-24 | Tokyo Electric Power Co Inc:The | Ground fault point detection device and ground fault point detection method |
KR101559533B1 (en) * | 2013-11-19 | 2015-10-15 | 이현창 | Mobile Apparatus And Method For Locating Earth Leaking Point |
JP2018031718A (en) * | 2016-08-26 | 2018-03-01 | 関西電力株式会社 | Overhead distribution system survey system and overhead distribution system survey method |
Non-Patent Citations (1)
Title |
---|
"CI operator's manual", 2009, SEBAKMT |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
RU2516299C2 (en) | Line damage detector | |
US7154279B2 (en) | Partial discharge detection test link, partial discharge detection system and methods for detecting partial discharge on a power cable | |
AU2019243131B2 (en) | Device and method for detecting high-voltage power distribution line path having improved stability | |
FI74365C (en) | METHOD ATT DETEKTERA JORDFEL I NAET FOER DISTRIBUTION AV ELEKTRISK KRAFT OCH ANORDNING FOER GENOMFOERANDE AV METODEN. | |
RU2583452C2 (en) | Directed detection of resistive ground fault and rupture of conductor of medium voltage | |
WO2019212125A1 (en) | Circuit breaker control module | |
WO2019190018A1 (en) | Earth leakage circuit breaker | |
CN111095000A (en) | High fidelity voltage measurement using capacitively coupled voltage transformers | |
CA3087482C (en) | Current converter | |
WO2019190170A1 (en) | Device and method for detecting high-voltage power distribution line path having improved stability | |
RU2636154C2 (en) | Method of determination of short circuit place at electrified railway station | |
WO2015076555A1 (en) | Mobile electric leakage detection device and method | |
WO2022010066A1 (en) | Earth leakage circuit breaker and control method of same earth leakage circuit breaker | |
CN113109646B (en) | Power cable identification method and cable identification instrument based on voice | |
CN212111734U (en) | Grounding fault phase detection system of ITN power supply system | |
CN114114069A (en) | Device and system for determining occurrence of ground fault of cable | |
CN107356833B (en) | Control measurement circuit of power frequency follow current test device | |
JPS6215473A (en) | Locating method for fault point of transmission line | |
CN113514669B (en) | Wiring method for traction substation equipment detection | |
JP2866172B2 (en) | Transmission line fault direction locating method | |
CN212433366U (en) | Device and system for determining occurrence of ground fault of cable | |
CN115436753A (en) | Cable line identification method and device and application method thereof | |
JPH0552467B2 (en) | ||
US20020030958A1 (en) | Protection against fault situations in a telecommunications network | |
JP2001194410A (en) | Method for measuring partial discharge of directly buried power cable |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 19776033 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 2020552015 Country of ref document: JP Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 3095262 Country of ref document: CA |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 2019243131 Country of ref document: AU Date of ref document: 20190326 Kind code of ref document: A |
|
ENP | Entry into the national phase |
Ref document number: 2019776033 Country of ref document: EP Effective date: 20201026 |