JP6597933B1 - Ground fault location device, ground fault location system, ground fault location method, program, recording medium - Google Patents

Abstract

A ground fault point locating device for locating a ground fault point of the transmission / distribution cable path based on various electrical quantities detected by a plurality of sensors installed in the transmission / distribution cable path, comprising: A first selection unit that selects a first sensor installed closest to the substation, and a first ground fault that indicates a waveform of a first ground fault current of the transmission and distribution line detected by the first sensor. First current information and first zero-phase voltage information indicating a sudden change in the first zero-phase voltage of the transmission and distribution line are acquired, and a first time indicating a first time when the first sensor detects the sudden change in the first zero-phase voltage. A first acquisition unit that acquires time information and a load side than the first sensor, and detects a sudden change in zero-phase voltage among the plurality of sensors within a predetermined time width with respect to the first time. Detected by a second selection unit for selecting a second sensor and the second sensor Obtaining second ground fault current information indicating a waveform of a second ground fault current of the transmission / distribution electric line and second zero phase voltage information indicating a sudden change of the second zero phase voltage of the transmission / distribution electric line; Based on the second acquisition unit that acquires second time information indicating the second time at which the sudden change in the second zero-phase voltage is detected, the first time information, and the second time information. A ground fault point location unit for standardizing the ground fault point of the track.

Description

  The present invention relates to a ground fault location device, a ground fault location system, a ground fault location method, a program, and a recording medium.

  For example, there is known a failure point location system for locating a ground fault point when a ground fault occurs in a power system (for example, Patent Document 1).

JP 2004-132762 A

  Patent Document 1 discloses a system for determining a ground fault point by calculating a difference in surge arrival time at each point by detecting a zero-phase current and a zero-phase voltage of a transmission and distribution line. In this system, the reference surge arrival time is calculated based on the waveform data and the time data of the ground fault current transmitted from one of the slave stations that detected the sudden change in the zero-phase voltage. Then, the ground fault point is determined based on the reference surge arrival time and the surge arrival time of the other slave station that detected the sudden change. That is, in the system described in Patent Document 1, since the reference surge arrival time is used as a reference, if the waveform data or time data that is the basis for calculating the reference surge arrival time is not a surge but noise, There was a risk of mislocation of points.

The main present invention for solving the above-described problems is a ground fault point locating device for locating the ground fault point of the transmission / distribution line based on various electrical quantities detected by a plurality of sensors installed in the transmission / distribution line. A first selection unit that selects a first sensor installed closest to the substation among the plurality of sensors, and a first ground fault current of the transmission and distribution line detected by the first sensor. The first ground fault current information indicating the waveform and the first zero phase voltage information indicating the sudden change of the first zero phase voltage of the transmission and distribution line are acquired, and the first sensor detects the sudden change of the first zero phase voltage. A first acquisition unit that acquires first time information indicating a first time, and a predetermined time width that is set on the load side of the first sensor and that is set for each transmission / distribution line with the first time as a reference Among the plurality of sensors, a sensor that detects a sudden change in zero-phase voltage is used. From the support, first show a second selection unit for the second WASH sensors installed in most load side, it is detected by the second sensor, the waveform of the second grounding current of said TD line 2 ground fault current information and second zero-phase voltage information indicating a sudden change in the second zero-phase voltage of the transmission and distribution line are acquired, and a second time when the second sensor detects the sudden change in the second zero-phase voltage is obtained. A second acquisition unit that acquires second time information, a ground fault point determination unit that determines a ground fault point of the transmission and distribution line based on the first time information and the second time information. Prepare.
Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  According to the present invention, it is possible to prevent mislocation of the ground fault point.

It is a lineblock diagram showing the ground fault location system concerning this embodiment. It is a block diagram which shows the 1st transmitter / receiver which concerns on this embodiment. It is a block diagram which shows the 2nd transmission / reception apparatus which concerns on this embodiment. It is a block diagram which shows the ground fault location apparatus which concerns on this embodiment. It is a block diagram which shows the controller of the ground fault point location apparatus which concerns on this embodiment. It is a wave form diagram which shows an example of the waveform data which concern on this embodiment. It is a figure which shows an example of the propagation condition of the ground fault electric current which concerns on this embodiment. It is a flowchart which shows the process sequence of the ground fault location system which concerns on this embodiment.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings. In the following description, parts denoted by the same reference numerals represent the same elements, and the basic configuration and operation thereof are the same.

=== Ground fault location system 100 ===
The ground fault location system 100 is a system that uses a plurality of sensors 20 to determine ground fault points.

  In the ground fault location system 100, the ground fault point is determined using the characteristic that the ground fault current on the power supply side in the transmission and distribution line 10 is larger than the ground fault current on the load side with respect to the ground fault point. To do. In recent years, since the sensitivity of the sensor 20 for measuring the ground fault current has been improved, an event has occurred in which the noise of the transmission and distribution line 10 is specified as the ground fault current, and the noise is used as a reference. The ground fault point cannot be located accurately. In the ground fault location system 100 according to the present embodiment, it is possible to prevent mislocation of the ground fault point due to such an event.

  The ground fault location system 100 includes a plurality of transmission / reception devices 110 and a ground fault location device 120. Hereinafter, in the description of the present embodiment, the first transmitter / receiver 111 and the second transmitter / receiver 112 are selected from the plurality of transmitter / receivers 110, and the first sensor 21 among the plurality of sensors 20 is selected. A description will be given assuming that the ground fault point is determined using the signal received from the second sensor 22.

  Here, the first sensor 21 is a sensor that detects a zero-phase voltage and a zero-phase current. The first sensor 21 is provided in a lead-out portion of the transmission / distribution electric line 10 in the substation 1. Specifically, for example, it is preferably installed on the first lead column 40 in the vicinity of the substation 1. The 1st sensor 21 is connected so that the signal which shows various electric quantities can be transmitted to the 1st transmission / reception apparatus 111. FIG. Therefore, the electrical quantities received by the first transmission / reception device 111 are electrical quantities at the lead-out portion of the transmission / distribution line 10 of the substation 1. As shown in FIG. 1, the first sensor 21 may be provided separately from the first transmission / reception device 111, but may be provided integrally with the first transmission / reception device 111.

  Similar to the first sensor 21, the second sensor 22 is a sensor that detects a zero-phase voltage and a zero-phase current, and is provided closer to the load side of the transmission / distribution electric line 10 than the first sensor 21. As will be described later, in the present embodiment, since the ground fault point between the first sensor 21 and the second sensor 22 can be determined, preferably, the ground fault occurring in the widest possible range of the power transmission and distribution system can be detected. The second sensor 22 is a sensor provided near the end of the power transmission and distribution line 10. The 2nd sensor 22 is connected so that the signal which shows various electrical quantities can be transmitted to the 2nd transmission / reception apparatus 112. FIG. As shown in FIG. 1, the second sensor 22 may be provided separately from the second transmission / reception device 112, but may be provided integrally with the second transmission / reception device 112.

  In the ground fault location system 100, each transmission / reception device 110 acquires signals indicating the zero-phase current and the zero-phase voltage measured by each sensor 20. Among the transmitting / receiving devices 110, the transmitting / receiving device 110 that has acquired a sudden change in the magnitude and frequency of the zero-phase voltage (hereinafter referred to as “sudden change signal”) is referred to as a zero-phase current (hereinafter referred to as “ground fault current”). ), And transmits time information and position information indicating the time when the sudden change signal is detected to the ground fault location device 120. The ground fault location device 120 selects the first transmission / reception device 111 and the second transmission / reception device 112 from the transmission / reception devices 110 that have acquired the sudden change signal, and based on the ground fault current and time information, Locate the entanglement point. A method for selecting the first transmission / reception device 111 and the second transmission / reception device 112 will be described in detail later. Hereinafter, while describing each component, the process sequence which locates the ground fault point of the power transmission and distribution line 10 is also demonstrated.

== First transmitter / receiver 111 ==
The 1st transmission / reception apparatus 111 is an apparatus which acquires the ground fault current and zero phase voltage which were measured with the 1st sensor 21, and transmits those information to a ground fault location apparatus. The 1st transmission / reception apparatus 111 is a transmission / reception apparatus selected by the ground fault location device 120 mentioned later, and is the transmission / reception installed in the location nearest to the substation 1 among the transmission / reception apparatuses 110 installed in the power transmission and distribution line 10. Device 110. In the following description, the “zero phase voltage” acquired by the first transmitter / receiver 111 from the first sensor 21 is referred to as “first zero phase voltage”, and the “ground fault current” is referred to as “first ground fault current”. .

  FIG. 2 is a configuration diagram of the first transmission / reception device 111. As shown in FIG. 2, the first transmission / reception device 111 includes an antenna, a GPS reception unit 111a, a first time specifying unit 111b, a first position calculation unit 111c, a first ground fault current detection unit 111d, 1 zero phase voltage detection part 111e, the 1st write control part 111f, controller 111g (CPU), memory 111h, and data communications department 111i are constituted.

  The GPS receiving unit 111a receives a signal related to time from the GPS satellite 30 via the antenna. The GPS receiving unit 111a outputs a predetermined clock signal to the first time specifying unit 111b and the first position calculating unit 111c. Thereby, since an exact time can be used, an accurate ground fault point can be determined.

  The first time specifying unit 111b outputs the counter value to the first write control unit 111f by synchronizing the internal high-speed clock with the clock signal output from the GPS receiving unit 111a.

  The first position calculation unit 111c calculates the position of the first sensor 21 on the transmission / distribution line 10 connected to the first transmission / reception device 111 based on the signal output from the GPS reception unit 111a. Then, the first position calculation unit 111c outputs first position information indicating the position of the first sensor 21 to the first writing control unit 111f. Note that it is not essential for the first transmission / reception device 111 to include the first position calculation unit 111c. If the first transmission / reception device 111 does not include the first position calculation unit 111c, the first transmission / reception device 111 replaces the first position information. In order to identify the first transmission / reception device 111, ID information indicating a code may be transmitted to the ground fault location device 120.

  The first ground fault current detection unit 111d digitally converts a signal indicating the first ground fault current input from the first sensor 21, and the digital data (first ground fault current information) is converted into the first write control unit 111f. Output to.

  The first zero-phase voltage detection unit 111e detects the magnitude of the zero-phase voltage and a sudden change in the frequency in the commercial frequency region by monitoring the first zero-phase voltage input from the first sensor 21. The first zero phase voltage detection unit 111e outputs a sudden change signal indicating a sudden change in the magnitude or frequency of the first zero phase voltage to the first write control unit 111f. In general, since the change in the zero-phase voltage is more significant than the change in the ground-fault current, the zero-phase voltage is used for detecting the ground fault. The time when the sudden change signal is detected will be described as “first time”, and information indicating the time will be described as “first time information”.

  The first write control unit 111f constantly records the first waveform data included in the first ground fault current information digitally converted by the first ground fault current detection unit 111d in the memory 111h arranged in a virtual ring shape. ,Update. Based on the sudden change signal output from the first zero-phase voltage detector 111e, the memory 111h is instructed to control the recording operation so that the first waveform data is not updated. The first writing control unit 111f records the first time information (time stamp) generated based on the counter value of the first time specifying unit 111b in the memory 111h. Further, the first write control unit 111f stores the first position information (or ID information) output from the first position calculation unit 111c in the memory 111h.

  When the controller 111g (CPU) detects the sudden change signal, the controller 111g (CPU) uses the first waveform data, the first time information and the first position information (or the ID information of the first transmission / reception device 111) recorded in the memory 111h as data. It transmits to the ground fault location device 120 via the communication unit 111i.

== Second transmission / reception device 112 ==
The 2nd transmission / reception apparatus 112 is an apparatus which acquires the ground fault current and zero phase voltage which were measured with the 2nd sensor 22, and transmits those information to a ground fault location apparatus. The second transmission / reception device 112 is a transmission / reception device selected by the ground fault location device 120. Among the transmission / reception devices 110 that have acquired a sudden change signal within a predetermined time width based on the first time, for example, the most load side It is the transmission / reception apparatus 110 installed in. In the following, the “zero phase voltage” acquired by the second transmitting / receiving device 112 from the second sensor 22 is referred to as a “second zero phase voltage”, the “zero phase current” is referred to as a “second ground fault current”, The waveform data of the second ground fault current is referred to as “second waveform data”.

  3, the first transmission / reception device 111 shown in FIG. 2 has the “first time identification unit 111b” as the “second time identification unit 112b” and the “first position”. The “calculation unit 111c” is the “second position calculation unit 112c”, the “first ground fault current detection unit 111d” is the “second ground fault current detection unit 112d”, and the “first zero-phase voltage detection unit 111e” is “ The second zero-phase voltage detection unit 112e ”, the“ first write control unit 111f ”is the“ second write control unit 112f ”, and has the same function as the first transmission / reception device 111. Description is omitted. The second writing control unit 112f records the second time information (time stamp) generated based on the counter value of the second time specifying unit 112b in the memory. Further, the second write control unit 112f stores the second position information output from the second position calculation unit 112c in the memory.

  When the controller 112g (CPU) detects the sudden change signal, the controller 112g (CPU) receives the second waveform data, the second time information, and the second position information (or ID information) recorded in the memory via the data communication unit 112i. Transmit to the ground fault location device 120.

== Ground fault location device 120 ==
The ground fault location device 120 selects the first transmission / reception device 111 and the second transmission / reception device 112 among the transmission / reception devices 110, and transmits the transmission based on various information received from the first transmission / reception device 111 and the second transmission / reception device 112. It is a device for locating the ground fault point of the distribution line 10.

  FIG. 4 is a hardware configuration diagram of the ground fault location device 120. The ground fault location device 120 includes a data communication unit 121, a controller 122 (CPU), an auxiliary storage device 123, and an input / output device 124.

  The data communication unit 121 (first and second acquisition units) receives various types of information between the data communication unit 111 i of the first transmission / reception device 111 and the data communication unit 112 i of the second transmission / reception device 112.

  FIG. 5 is a software configuration diagram of the controller 122. The controller 122 includes a selection processing unit 122a that selects a desired transmission / reception device 110 among the transmission / reception devices 110 connected to each sensor 20 installed in the transmission / distribution electric line 10, and a selected transmission / reception device 110 (first- Surge arrival time (first and second surge arrival time) based on the waveform data (first and second waveform data) and time information (first and second time information) collected from the second transmitting / receiving devices 111 and 112) Surge arrival time calculation processing unit 122b for calculating the ground fault point location determination processing unit 122c for determining the ground fault point based on the calculated surge arrival time. These functional units are realized, for example, by the controller 122 reading and executing a program stored in the memory. Note that these functional units may be realized by hardware such as ASIC, for example. Alternatively, the controller 122 may be realized by reading and executing a program stored in an external storage medium.

  The selection processing unit 122a includes a first transmission / reception device 111 that acquires electrical quantity signals from the first sensor 21 that is installed closest to the substation 1 among the sensors 20 that are installed in the transmission and distribution line 10. Select. For example, the selection processing unit 122a receives position information from each transmission / reception device 110 that has acquired a sudden change signal installed in the transmission / distribution electric line 10, and based on the position information, the first transmission / reception device 111 (first sensor 21). Is selected. The selection of the first transmission / reception device 111 in the selection processing unit 122a is performed, for example, by previously storing the position information of each transmission / reception device 110 (each sensor 20) in a database (not shown) and based on the database. A method of selecting 111 is used. In addition, when receiving ID information instead of position information from the transmission / reception device 110, the ID information is stored in the database, and the first transmission / reception device 111 may be selected based on the database.

  In addition, the selection processing unit 122a uses, for example, the first transmission / reception device 111 (the first sensor 21) as a reference among the transmission / reception devices 110 that have acquired the sudden change signal within a predetermined time width based on the first time. The second transmission / reception device 112 (second sensor 22) installed on the load side is selected based on the position information (or ID information). The predetermined time width is a value arbitrarily set for each transmission / distribution electric line, and is not particularly limited. The selection of the second transmission / reception device 112 in the selection processing unit 122a is stored, for example, in the position information of the transmission / reception device 110 that acquired the sudden change signal within a predetermined time width based on the first time and the above-described database. The transmission / reception device 110 installed closest to the load is selected as the second transmission / reception device 112 among the transmission / reception devices 110 that have acquired the sudden change signal by comparing the position information. Further, when receiving the ID information instead of the location information from the transmission / reception device 110, the selection processing unit 122a stores the ID information in the database in advance, and compares the ID information of the transmission / reception device 110 with the ID information of the database. The transmission / reception device 110 installed on the most load side is selected as the second transmission / reception device 112. Thereby, the 2nd transmission / reception apparatus 112 installed near the terminal of the power transmission and distribution line 10 can be selected.

  The processing of the selection processing unit 122a will be described with reference to FIG. FIG. 6 is a waveform diagram showing time on the horizontal axis and current values on the vertical axis. When the first time of the first waveform data acquired by the first transmission / reception device 111 that has detected the sudden change signal is used as a reference, the transmission / reception devices 110 other than the first transmission / reception device 111 have a predetermined time width as shown in FIG. A plurality of waveform data are included. Here, the selection processing unit 122a selects the second waveform data determined to be the most loaded side in a predetermined time width based on the position information, from the waveform data acquired by the transmission / reception device 110. Thereby, the 2nd transmission / reception apparatus 112 which transmitted 2nd waveform data can be selected.

  In addition, although the selection process part 122a demonstrated as what selects the 2nd transmission / reception apparatus 112 most installed in the load side based on position information, it is not limited to this. For example, among the waveform data acquired from the transmission / reception device 110, the transmission / reception device that selects the waveform data that indicates a minimum value that is equal to or higher than a predetermined threshold for eliminating noise, and transmits the waveform data 110 may be selected as the second transmission / reception device 112. Thereby, the transmitter / receiver 110 farthest from the ground fault point on the load side than the ground fault point can be selected. In FIG. 7, in order to help understanding of this selection method, the flow of the ground fault current is indicated by an arrow, and the magnitude of the ground fault current is indicated by the thickness on the transmission and distribution line 10. As shown in FIG. 7, this selection method uses the phenomenon that the ground fault current is smaller on the load side than on the power source side with respect to the ground fault point.

  The surge arrival time calculation processing unit 122b analyzes the first and second waveform data based on the first and second time information, so that the first and second ground fault currents are converted into the first and second sensors 21. , 22 is a process of calculating first and second surge arrival times indicating the time of arrival. As described above, the surge arrival time calculation processing unit 122b can accurately specify the surge arrival time by using the waveform data of the ground fault current that is significantly changed compared to the steady state. For calculating the first and second surge arrival times, a known method for correcting the surge arrival time, such as a two-potential method, is used.

  The ground fault point location processing unit 122c is a process of locating the ground fault point of the power transmission and distribution line 10 using a predetermined calculation formula based on the first and second surge arrival times.

Specifically, the positioning method in the ground fault location determination processing unit 122c is described. Since the surge propagation speed between the first transmission / reception device 111 and the second transmission / reception device 112 is constant, the first and second transmission / reception devices 111 are provided. , 112 is proportional to the distance from the ground fault point to the first and second transmission / reception devices 111, 112. Accordingly, the ground fault point location processing unit 122c sets the surge propagation speed to V, sets the length of the transmission and distribution line between the first transmission / reception device 111 and the second transmission / reception device 112 to L, and The first surge arrival time is T1, the second surge arrival time of the second transmitter / receiver 112 is T2, the distance from the first transmitter / receiver 111 to the ground fault point is L1, and the second transmitter / receiver 112 to the ground fault point If the distance of L2 is L2, the following equation holds.
(L1-L2) = V × (T1-T2)
L2 = L-L1
From these equations, the ground fault point location processing unit 122c calculates the distance L1 from the first transmission / reception device 111 to the ground fault point using the equation (1).

  L1 = (L + (T1−T2) × V) ÷ 2 (1)

  In the above description, the ground fault position locating processing unit 122c has been described as locating the ground fault point of the transmission and distribution line 10 using a predetermined calculation formula based on the first and second surge arrival times. It is not limited to. For example, the ground fault point location processing unit 122c locates the ground fault point of the transmission / distribution line 10 according to the equation (1) based on the first and second time information instead of the first and second surge arrival times. May be. Thereby, since calculation processing can be reduced, calculation speed can be improved. In this case, the controller 122 may not have the surge arrival time calculation processing unit 122b.

  The auxiliary storage device 123 is configured by a hard disk or the like, and is a device that records various information transmitted from the first and second transmission / reception devices 111 and 112 and various information calculated by the controller 122. The controller 122 acquires various types of information from the auxiliary storage device 123 as necessary.

  The input / output device 124 is a device including a keyboard for inputting data necessary for processing in the controller 122, a display unit for displaying processing results, a printer for printing processing results, and the like.

=== Processing Procedure of Ground Fault Location System 100 ===
FIG. 8 is a flowchart showing the processing procedure of the ground fault location system 100. The procedure for locating the ground fault point in the ground fault locating system will be described below with reference to FIG.

  When a ground fault occurs in the transmission / distribution electric line 10, the sensor 20 installed in the transmission / distribution electric line 10 detects a surge generated at the ground fault point (S1, S2). The sensor 20 detects a surge voltage component (zero phase voltage) and a current component (ground fault current). The sensor 20 outputs a signal (electric quantity signal) related to the zero-phase voltage and the ground fault current to the transmission / reception device 110 connected to the sensor 20.

  The transmission / reception device 110 receives the electrical quantity signal and generates time information indicating the time when the sudden change is detected based on the sudden change signal indicating the sudden change of the zero-phase voltage. The transmission / reception device 110 generates waveform data indicating the waveform of the ground fault current from the electrical quantity signals. Further, the transmission / reception device 110 generates position information indicating the position of the connected sensor 20 or ID information indicating itself (hereinafter described as position information or ID information as “position information”). Note that the length L of the transmission / distribution cable path between the first transmission / reception device 111 and the second transmission / reception device 112 is recorded in advance for each position information (when transmitting ID information, the transmission / reception device corresponding to each ID information is recorded in advance. Position information). The transmission / reception device 110 that has detected the sudden change signal transmits time information, waveform data, and position information to the ground fault location device 120 (S12).

  The ground fault location device 120 selects the first transmission / reception device 111 and the second transmission / reception device 112 based on the position information (S13). About selection of the 1st transmission / reception apparatus 111 by the ground fault point location apparatus 120, the 1st positional information from the 1st transmission / reception apparatus 111 is compared with the positional information preserve | saved in the database, and it corresponds to 1st positional information. By specifying the position information on the database, the transmission / reception device 110 corresponding to the position information on the database is selected as the first transmission / reception device 111. Regarding the selection of the second transmission / reception device 112 by the ground fault location device 120, the transmission / reception device installed on the most load side among the transmission / reception devices 110 that have detected a sudden change signal in a predetermined time width based on the first time. 110 is selected as the second transmission / reception device 112. As described in the “selection processing unit 122a”, this selection method is stored in the above-described database and the position information of the transmission / reception device 110 that has detected the sudden change signal within a predetermined time width based on the first time. The transmission / reception device 110 installed on the most load side is selected as the second transmission / reception device 112 by comparing the position information.

  The ground fault location device 120 analyzes the first waveform data of the first transmission / reception device 111 and the second waveform data of the second transmission / reception device 112. The ground fault location device 120 calculates the first surge arrival time and the second surge arrival time by using a known method for correcting the surge arrival time, such as a two-potential method, based on the analysis result (S14). .

  The ground fault point locating device 120 substitutes the first surge arrival time and the second surge arrival time into the equation (1) to determine the ground fault point (S16).

=== Summary ===
As described above, the ground fault point locating device 120 according to the present embodiment is based on the electrical quantities detected by the plurality of sensors 20 installed in the transmission / distribution cable path 10 and the ground fault point of the transmission / distribution cable path 10. The ground fault point locating device 120 for locating the first sensor 21 and the first sensor 21 for detecting the first sensor 21 installed closest to the substation 1 among the plurality of sensors 20. The first ground fault current information indicating the waveform of the first ground fault current of the transmission and distribution line 10 and the first zero phase voltage information indicating the sudden change of the first zero phase voltage of the transmission and distribution line 10 are acquired, and the first sensor 21 acquires first time information indicating a first time when the first zero-phase voltage is detected to be suddenly changed, and is installed on the load side with respect to the first sensor 21, and a plurality of times within a predetermined time width based on the first time. The second sensor 22 that detects a sudden change in the zero-phase voltage among the sensors 20 The second selection unit to be selected and the second ground fault current information indicating the waveform of the second ground fault current of the transmission / distribution electric line 10 detected by the second sensor 22 and the sudden change of the second zero-phase voltage of the transmission / distribution electric line 10 Data communication unit 121 (a first acquisition unit, a second acquisition unit) that acquires second time information indicating a second time at which the second sensor 22 detects a sudden change in the second zero phase voltage. (Second acquisition unit), ground time point location processing unit 122c (ground fault point location unit) that locates the ground fault point of the transmission and distribution line 10 based on the first time information and the second time information, Is provided. According to the present embodiment, since the ground fault point is determined based on various electrical quantities measured by the sensor 20 closest to the substation 1, the ground fault point is determined based on the sensor 20 that detects noise. Incorrect grounding of ground fault location can be prevented.

  Moreover, the ground fault point location device 120 according to the present embodiment starts from the ground fault point at the first point where the first sensor 21 is installed based on the first ground fault current information and the first time information. The first surge arrival time indicating the time when the surge arrives is calculated, and the ground fault is detected at the second point where the second sensor 22 is installed based on the second ground fault current information and the second time information. A surge arrival time calculation processing unit 122b (first surge arrival time calculation unit, second surge arrival time calculation unit) that calculates a second surge arrival time indicating a time at which a surge from the point arrives, and a ground fault point The position location processing unit 122c determines the ground fault point based on the first surge arrival time and the second surge arrival time. According to the present embodiment, the surge arrival time is calculated using the waveform data of the ground fault current, and by using the surge arrival time, the ground fault point is more accurately determined than the time specified by the sudden change of the zero phase voltage. Can be standardized.

  In addition, the selection processing unit 122a (first selection unit) of the ground fault point location device 120 according to the present embodiment uses the first sensor 21 based on the position information of each point where the plurality of sensors 20 are installed. Select. According to the present embodiment, since the current position of each sensor 20 can be accurately grasped, the influence of the relocation of the sensor 20 and the like can be eliminated, and the ground fault point can be accurately determined.

  In addition, the ground fault location system 100 according to the present embodiment inputs the first ground fault current and the first zero-phase voltage from the ground fault location device 120 and the first sensor 21, and the first ground fault current information and The first transmitter / receiver 111 that transmits the first time information to the ground fault location device 120, the second ground fault current and the second zero-phase voltage are input from the second sensor 22, the second ground fault current information and the second A second transmission / reception device 112 that transmits time information to the ground fault location device 120. The first transmission / reception device 111 includes a first zero-phase voltage detection unit 111e that detects a sudden change in the first zero-phase voltage; 1st time specific part 111b which specifies the time which detected sudden change of 1 zero phase voltage as the 1st time, and 1st ground fault current detecting part 111d which detects the 1st ground fault current, The device 112 detects a sudden change in the second zero-phase voltage. Has a detection section, and the second time specifying unit for specifying a time of detecting the sudden change of the second zero-phase voltage as the second time, a second grounding current detecting section for detecting a second grounding current, the. According to the present embodiment, it is possible to prevent mislocation of the ground fault point by performing ground fault point location with reference to the sensor 20 that has detected noise.

  Moreover, the 1st sensor 21 connected with the 1st transmission / reception apparatus 111 of the ground fault location system 100 which concerns on this embodiment attaches the transmission / distribution electric wire path 10 in the exit point from the substation 1 to the transmission / distribution electric cable path 10. It is installed on the first drawer column 40. According to the present embodiment, by providing the first sensor 21 at the location closest to the substation 1, it is possible to acquire various electrical quantities that serve as a reference for locating the ground fault point. A point can be located.

  In addition, the first transmission / reception device 111 of the ground fault location system 100 according to the present embodiment calculates first position information indicating the position of the first transmission / reception device 111 based on a signal transmitted from the GPS satellite 30. The first position calculation unit 111c is further provided, and the first selection unit of the ground fault location device 120 selects the first sensor 21 based on the first position information. According to this embodiment, since accurate position information can be calculated, the ground fault point can be accurately determined.

  Further, the first time and the second time in the ground fault location system 100 according to the present embodiment are calculated based on a signal transmitted from the GPS satellite 30. According to this embodiment, since accurate time information can be calculated, the ground fault point can be accurately determined.

  The embodiments described above are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Substation 10 Transmission / distribution electric line 20 Sensor 21 1st sensor 22 2nd sensor 30 GPS satellite 40 1st extraction pillar 100 Ground fault location system 110 Transmission / reception apparatus 111 1st transmission / reception apparatus 111b 1st time specific | specification part 111c 1st position calculation Unit 111d first ground fault current detection unit 111e first zero phase voltage detection unit 112 second transmission / reception device 112b second time specifying unit 112d second ground fault current detection unit 112e second zero phase voltage detection unit 120 ground fault location device 121 Data communication unit 122a Selection processing unit 122c Ground fault point location processing unit

Claims (10)

A ground fault point locating device for locating a ground fault point of the transmission / distribution electric line based on various electrical quantities detected by a plurality of sensors installed in the transmission / distribution electric line,
A first selection unit for selecting a first sensor installed closest to the substation among the plurality of sensors;
First ground fault current information indicating a waveform of a first ground fault current of the transmission / distribution electric line detected by the first sensor and first zero phase voltage information indicating a sudden change of the first zero phase voltage of the transmission / distribution electric line. A first acquisition unit that acquires first time information indicating a first time when the first sensor detects a sudden change in the first zero-phase voltage;
A sensor that is installed on the load side of the first sensor and that detects a sudden change in zero phase voltage among the plurality of sensors within a predetermined time width set for each of the transmission / distribution electric lines with reference to the first time. from among, a second selection unit for selecting a constant a second sensor installed in the most load side,
Second ground fault current information indicating the waveform of the second ground fault current of the transmission / distribution electric line detected by the second sensor and second zero phase voltage information indicating a sudden change of the second zero phase voltage of the transmission / distribution electric line. A second acquisition unit that acquires second time information indicating a second time when the second sensor detects a sudden change in the second zero-phase voltage;
A ground fault point locating unit for locating a ground fault point of the transmission and distribution line based on the first time information and the second time information;
A ground fault location device characterized by comprising: Based on the first ground fault current information and the first time information, the first surge arrival indicating the time when the surge from the ground fault point reaches the first point where the first sensor is installed. A first surge arrival time calculation unit for calculating time;
Based on the second ground fault current information and the second time information, a second surge arrival indicating a time at which a surge from the ground fault point arrives at a second point where the second sensor is installed. A second surge arrival time calculation unit for calculating time;
Further comprising
The ground fault location unit is
The ground fault point locating device according to claim 1, wherein the ground fault point is determined based on the first surge arrival time and the second surge arrival time. The ground fault according to claim 1 or 2, wherein the first selection unit selects the first sensor based on positional information of each point where the plurality of sensors are installed. Pointing device. A ground fault location system for locating the ground fault point of the power transmission and distribution line based on electrical quantities detected by a plurality of sensors installed in the transmission and distribution line,
The ground fault location device according to any one of claims 1 to 3,
A first transmitting / receiving device that inputs the first ground fault current and the first zero-phase voltage from the first sensor, and transmits the first ground fault current information and the first time information to the ground fault locating device; ,
A second transmission / reception device for inputting the second ground fault current and the second zero-phase voltage from the second sensor, and transmitting the second ground fault current information and the second time information to the ground fault location device; ,
With
The first transmitting / receiving device includes:
A first zero-phase voltage detector that detects a sudden change in the first zero-phase voltage;
A first time specifying unit for specifying a time at which a sudden change in the first zero-phase voltage is detected as the first time;
A first ground fault current detection unit for detecting the first ground fault current;
Have
The second transmission / reception device includes:
A second zero-phase voltage detector for detecting a sudden change in the second zero-phase voltage;
A second time specifying unit for specifying a time at which a sudden change in the second zero-phase voltage is detected as the second time;
A second ground fault current detection unit for detecting the second ground fault current;
A ground fault location system characterized by comprising: 5. The ground fault point according to claim 4, wherein the first sensor is installed at a first lead column that is attached to the transmission / distribution line, at an exit point from a substation to the transmission / distribution line. Orientation system. The first transmission / reception device further includes a first position calculation unit that calculates first position information indicating a position of the first transmission / reception device based on a signal transmitted from a GPS satellite;
The ground fault point location system according to claim 4 or 5, wherein the first selection unit of the ground fault point location device selects the first sensor based on the first position information. The ground fault location system according to any one of claims 4 to 6, wherein the first time and the second time are calculated based on a signal transmitted from a GPS satellite. Computer
A first selection step of selecting a first sensor installed closest to the substation among the plurality of sensors;
First ground fault current information indicating a waveform of a first ground fault current of the transmission / distribution electric line detected by the first sensor and first zero phase voltage information indicating a sudden change of the first zero phase voltage of the transmission / distribution electric line. A first acquisition step of acquiring first time information indicating a first time when the first sensor detects a sudden change in the first zero-phase voltage;
A sudden change in the zero-phase voltage is detected among the plurality of sensors within a predetermined time width that is set on the load side of the first sensor and set for each of the transmission and distribution lines with the first time as a reference. from the sensor, and a second selection step of selecting the constant of the second sensor installed in the most load side,
Second ground fault current information indicating the waveform of the second ground fault current of the transmission / distribution electric line detected by the second sensor and second zero phase voltage information indicating a sudden change of the second zero phase voltage of the transmission / distribution electric line. A second acquisition step of acquiring second time information indicating a second time when the second sensor detects a sudden change in the second zero-phase voltage;
A ground fault point locating step for locating a ground fault point of the transmission and distribution line based on the first time information and the second time information;
The ground fault location method characterized by performing. On the computer,
A first selection function for selecting a first sensor installed closest to the substation among the plurality of sensors;
First ground fault current information indicating a waveform of a first ground fault current of the transmission / distribution electric line detected by the first sensor and first zero phase voltage information indicating a sudden change of the first zero phase voltage of the transmission / distribution electric line. A first acquisition function for acquiring first time information indicating a first time when the first sensor detects a sudden change in the first zero-phase voltage;
A sudden change in the zero-phase voltage is detected among the plurality of sensors within a predetermined time width that is set on the load side of the first sensor and set for each of the transmission and distribution lines with the first time as a reference. from the sensor, and a second selection function for selecting a constant a second sensor installed in the most load side,
Second ground fault current information indicating the waveform of the second ground fault current of the transmission / distribution electric line detected by the second sensor and second zero phase voltage information indicating a sudden change of the second zero phase voltage of the transmission / distribution electric line. A second acquisition function for acquiring second time information indicating a second time when the second sensor detects a sudden change in the second zero-phase voltage;
A ground fault point locating function for locating a ground fault point of the transmission and distribution line based on the first time information and the second time information;
A program to realize On the computer,
A first selection function for selecting a first sensor installed closest to the substation among the plurality of sensors;
First ground fault current information indicating a waveform of a first ground fault current of the transmission / distribution electric line detected by the first sensor and first zero phase voltage information indicating a sudden change of the first zero phase voltage of the transmission / distribution electric line. A first acquisition function for acquiring first time information indicating a first time when the first sensor detects a sudden change in the first zero-phase voltage;
A sudden change in the zero-phase voltage is detected among the plurality of sensors within a predetermined time width that is set on the load side of the first sensor and set for each of the transmission and distribution lines with the first time as a reference. from the sensor, and a second selection function for selecting a constant a second sensor installed in the most load side,
Second ground fault current information indicating the waveform of the second ground fault current of the transmission / distribution electric line detected by the second sensor and second zero phase voltage information indicating a sudden change of the second zero phase voltage of the transmission / distribution electric line. A second acquisition function for acquiring second time information indicating a second time when the second sensor detects a sudden change in the second zero-phase voltage;
A ground fault point locating function for locating a ground fault point of the transmission and distribution line based on the first time information and the second time information;
The computer-readable recording medium which recorded the program for implement | achieving.

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