Injection-type fault positioning detection apparatus for 10-KV network distribution high-voltage line

Abstract

An injection-type fault positioning detection apparatus and detection method for a 10-KV network distribution high-voltage line. The detection apparatus comprises a plurality of signal generators (2) and a plurality of mutual inductors (3), which are correspondingly connected to the plurality of signal generators (2) on a one-to-one basis, wherein each signal generator (2) is arranged to correspond to a pole-mounted switch (1) on a high-voltage line, and different signal generators (2) correspond to different pole-mounted switches (1); a plurality of groups of pole-mounted switches (1) are arranged on the high-voltage line, and the plurality of groups of pole-mounted switches (1) divide the high-voltage line into a plurality of line segments; an output end of each signal generator (2) is configured to be electrically connected to an output side of the corresponding pole-mounted switch (1); a detection end of each mutual inductor (3) is configured to be electrically connected to an output side of the corresponding pole-mounted switch (1); each signal generator (2) is configured to send a detection signal to a connected line segment when the line is faulty, and each mutual inductor (3) is configured to check circuit parameters of a line segment that has received the detection signal; and each signal generator (2) is further configured to receive the circuit parameters and determine a faulty line segment and a fault type on the basis of the circuit parameters.

Description

10KV distribution network high voltage line injection fault location detection device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on December 15, 2023, with application number 202311737698.0. The entire contents of the above application are incorporated by reference into this application. Technical Field

[0002] The present application relates to the technical field of fault detection, for example, to a 10KV distribution network high-voltage line injection-type fault location detection device and detection method. Background Art

[0003] With the continuous development of power supply networks and their increasing coverage, the requirements for safe grid operation and rapid power transmission after faults are becoming increasingly stringent. However, when a high-voltage line outage occurs due to a fault, related technologies require manual on-site fault testing, which is dangerous and inefficient. Summary of the Invention

[0004] The present application provides a 10KV distribution network high-voltage line injection-type fault location detection device and detection method to solve the problem that the high-voltage line cannot remotely determine the fault point and fault type.

[0005] The present application provides a 10KV distribution network high-voltage line injection-type fault location detection device, comprising: a plurality of signal generators and a plurality of mutual inductors connected to the plurality of signal generators in a one-to-one correspondence;

[0006] Each of the signal generators is configured to correspond to a pole switch on the high-voltage line, and different signal generators correspond to different pole switches; wherein the high-voltage line is provided with multiple groups of pole switches, and the multiple groups of pole switches divide the high-voltage line into multiple line sections;

[0007] The output end of the signal generator is configured to be electrically connected to the output side of the corresponding pole-mounted switch; the detection end of the mutual inductor is configured to be electrically connected to the output side of the corresponding pole-mounted switch; the signal generator is configured to send a detection signal to the connected line segment when a line fault occurs, and the mutual inductor is configured to detect the circuit parameters of the line segment that receives the detection signal; the signal generator is also configured to receive the circuit parameters and determine the faulty line segment and the fault type based on the circuit parameters.

[0008] Optionally, the signal generator includes a control switch, which is connected to the output side of the corresponding pole switch; the control switch is configured to be normally open when the output side of the pole switch to which the signal generator is connected is energized, and to be normally closed when the output side of the pole switch to which the signal generator is connected is de-energized; the signal generator is configured to start when the control switch is closed.

[0009] Optionally, the signal generator includes an emergency power supply, a charging end of the emergency power supply is electrically connected to an output side of a transformer correspondingly connected to the signal generator, and the emergency power supply is configured to input current or voltage into the high-voltage line.

[0010] Optionally, the transformer includes a current transformer and a voltage transformer;

[0011] The current transformer is configured to detect a current signal on the line segment that receives the detection signal, and the voltage transformer is configured to detect a voltage signal on the line segment that receives the detection signal.

[0012] Optionally, the signal generator includes a communication module; the communication module is configured to be connected to a background device via wireless communication.

[0013] The present application also provides a 10KV distribution network high-voltage line injection-type fault location detection method, which is performed by the 10KV distribution network high-voltage line injection-type fault location detection device described in any of the above items; the detection method includes:

[0014] closing a pole switch and controlling a signal generator connected to an output side of the pole switch to send a detection signal to the connected line segment;

[0015] controlling a mutual inductor connected to an output side of the pole-mounted switch to detect a circuit parameter of the line segment receiving the detection signal, wherein the mutual inductor is connected to the signal generator;

[0016] controlling the signal generator to receive the circuit parameters, and determining the line segment where the fault occurs and the type of the fault according to the circuit parameters;

[0017] Multiple tripped pole switches are closed in sequence in a preset order, and the faulty line section and fault type are determined based on circuit parameters detected by the mutual inductor connected to the output side of each pole switch.

[0018] Optionally, controlling the signal generator connected to the output side of the pole-mounted switch to send a detection signal to the connected line segment includes:

[0019] In the pole-mounted switch that controls the tripping, the signal generator connected to the output side of the pole-mounted switch closest to the power transmission end of the high-voltage line sends the detection signal to the connected line section.

[0020] Optionally, closing a plurality of tripped pole switches in a preset order comprises:

[0021] A plurality of tripped pole switches are closed in sequence in the order of being away from the power transmission end of the high-voltage line.

[0022] Optionally, the step of controlling the signal generator connected to the output side of the pole-mounted switch to send a detection signal to the connected line segment includes:

[0023] Controlling the signal generator to send a detection signal to each phase line of the connected line segment;

[0024] The step of controlling the mutual inductor connected to the output side of the pole-mounted switch to detect the circuit parameters of the line segment receiving the detection signal, controlling the signal generator to receive the circuit parameters, and determining the line segment where the fault occurs and the type of the fault according to the circuit parameters includes:

[0025] The mutual inductor connected to the output side of the pole-mounted switch and the mutual inductor of the adjacent line segment detect the circuit parameters of the line segment that receives the detection signal, and obtain the current signal and voltage signal of the line segment that receives the detection signal;

[0026] The signal generator is controlled to receive the current signal and the voltage signal, and judge whether a fault occurs in the line segment and the type of the fault according to the current signal and the voltage signal. The fault type includes a phase-to-phase short circuit fault, a line break fault or a single-phase grounding fault. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The following is a brief introduction to the drawings required for describing the embodiments.

[0028] FIG1 is a schematic diagram of the arrangement of a 10KV distribution network high-voltage line injection-type fault location detection device according to an embodiment of the present application;

[0029] FIG2A is a circuit diagram of a 10KV distribution network high-voltage line injection-type fault location detection device according to an embodiment of the present application;

[0030] FIG2B is a circuit diagram of another 10KV distribution network high-voltage line injection-type fault location detection device provided according to an embodiment of the present application;

[0031] FIG3 is a circuit diagram of another 10KV distribution network high-voltage line injection-type fault location detection device provided according to an embodiment of the present application;

[0032] FIG4 is a circuit diagram of another 10KV distribution network high-voltage line injection-type fault location detection device according to an embodiment of the present application;

[0033] FIG5 is a flow chart of a 10KV distribution network high-voltage line injection fault location detection method provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. The described embodiments are some of the embodiments related to the present application, but not necessarily all of the embodiments.

[0035] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, in addition to the process, method, system, product or equipment comprising a series of steps or units shown in the embodiments of the present application, other processes, methods, systems, products or equipment of this series of steps or units not clearly listed may also be included, or other steps or units inherent to these processes, methods, systems, products or equipment.

[0036] The present application provides a 10KV distribution network high-voltage line injection-type fault location detection device. FIG1 is a schematic diagram of the layout of a 10KV distribution network high-voltage line injection-type fault location detection device provided in an embodiment of the present application. Referring to FIG1 , a plurality of pole-mounted switches 1 are provided on the high-voltage line, and the pole-mounted switches 1 divide the high-voltage line into different line segments. The 10KV distribution network high-voltage line injection-type fault location detection device, which can also be referred to as a high-voltage line fault detection system, comprises: a plurality of signal generators 2 and a plurality of mutual inductors 3 corresponding to the plurality of signal generators. Each signal generator 2 is provided corresponding to a pole-mounted switch 1, wherein different signal generators 2 correspond to different pole-mounted switches 1. The detection end of the mutual inductor 3 is electrically connected to the output side of the corresponding pole-mounted switch 1. The output end of the signal generator 2 is electrically connected to the output side of the corresponding pole-mounted switch 1. The signal generator 2 is configured to send a detection signal to the corresponding line segment when a line fault occurs, and the mutual inductor 3 is configured to detect the circuit parameters of the corresponding line segment.

[0037] For example, when a high-voltage line fault occurs, the pole-mounted switches 1 for the entire section of the line on the fault side will be disconnected. At this time, the signal generator 2 near the fault side is put into operation, and the pole-mounted switches 1 near the next line section on the fault side are closed. Signal generator 2 sends a detection signal to the three phases A, B, and C of the high-voltage line on the fault side through the output side of the pole-mounted switch 1 near the fault side. The transformer 3 near the fault side and the transformer 3 near the next line section on the fault side detect the detection signal and input the detected signal into signal generator 2. Signal generator 2 judges the detected signal. If the data is abnormal, it indicates that the fault occurred in this line section, and signal generator 2 determines the fault type. If the data is normal, it indicates that the fault did not occur in this section. Then, the pole-mounted switch 1 of the next line section that has been disconnected will be closed, and the judgment will continue until the line section where the fault is located is detected.

[0038] For example, an embodiment of the present application also provides another fault judgment method. When a high-voltage line fault occurs, the pole-mounted switch 1 of the entire line section on the fault side will be disconnected. At this time, the signal generator 2 near the power-consuming side is put into operation, and the pole-mounted switch 1 near the previous line section on the power-consuming side is closed. The signal generator 2 sends a detection signal to the three phases A, B, and C of the high-voltage line on the fault side through the output side of the pole-mounted switch 1 near the power-consuming side. The mutual inductor 3 near the power-consuming side and the mutual inductor 3 near the next line section on the power-consuming side detect the detection signal and input the detected signal into the signal generator 2. The signal generator 2 judges the detected signal. If the data is abnormal, it indicates that the fault occurred in this line section, and the signal generator 2 determines the fault type. If the data is normal, it indicates that the fault did not occur in this section, and the pole-mounted switch 1 of the next line section that has been disconnected will be closed, and the judgment will continue until the line section where the fault is located is detected.

[0039] The embodiment of the present application, by providing a signal generator 2 and a mutual inductor 3, can generate a detection signal from the signal generator 2 when a line fault occurs, and after the mutual inductor 3 detects the detection signal, the detected signal is input into the signal generator 2 again, thereby automatically determining the fault type and fault section, allowing staff to quickly determine the location of the fault point and perform repairs based on the fault point and fault type. In summary, the present application can quickly determine the location and fault type of the fault point after a line power outage, eliminating the need for manual on-site section-by-section testing, thereby improving work efficiency and reducing workload.

[0040] Continuing to refer to Figure 1, optionally, the signal generator 2 includes a control switch 21, which is connected to the output side of the corresponding pole switch 1; the control switch 21 is configured to be normally open when the output side of the pole switch 1 is energized, and normally closed when the output side of the pole switch 1 is de-energized; the signal generator 2 is configured to start when the control switch 21 is closed.

[0041] For example, when the high-voltage line is operating normally, the output side of the pole switch 1 is energized, the control switch 21 is energized and in the disconnected state, the pole switch 1 is in the off state, and the signal generator 2 does not send a detection signal to the output side of the pole switch 1. When the high-voltage line fails, the output side of the pole switch 1 on the fault side loses power, and the control switch 21 loses power, transitioning from the disconnected state to the closed state. The signal generator 2 is activated, sending a detection signal to the output side of the pole switch 1, and performing fault detection.

[0042] Figure 2A is a circuit diagram of a 10KV distribution network high-voltage line injection-type fault location detection device provided in an embodiment of the present application. Referring to Figure 2A, optionally, the signal generator 2 also includes an emergency power supply 22, and the charging end of the emergency power supply 22 is electrically connected to the output side of the transformer 3. The emergency power supply 22 is configured to input current or voltage into the high-voltage line.

[0043] For example, when the high-voltage line is fault-free, the pole-mounted switch 1 is closed, and the transformer 3 converts the high-voltage power on the high-voltage line into low-voltage power, which is then fed into the signal generator 2. The emergency power supply 22 in the signal generator 2 receives the low-voltage power converted by the transformer 3 and charges itself. When the high-voltage line fails, the pole-mounted switch 1 disconnects the power supply on the input side. At this point, the signal generator 2 activates, and the emergency power supply 22 amplifies the current or voltage signal and converts it into a detection signal. This detection signal is then fed into the output side of the pole-mounted switch 1 on the fault side, sending a detection signal to the three phases A, B, and C of the high-voltage line.

[0044] Optionally, the transformer 3 includes a current transformer 31 and a voltage transformer 32. The current transformer 31 is configured to detect a current signal on a line segment receiving a detection signal, and the voltage transformer 32 is configured to detect a voltage signal on a line segment receiving a detection signal.

[0045] For example, when a high-voltage line fault occurs, the pole-mounted switch 1 inputs a detection signal into the fault-side line segment, and the transformer 3 detects the detection signal. For example, when a line fault occurs, the first and second transformers 3 close to the fault side are activated, and the two current transformers test the current signals of the three phases A, B, and C of the high-voltage line separately, detecting whether the current of each phase in the three phases A, B, and C is abnormal. The voltage transformer tests the voltage signals of the three phases A, B, and C of the high-voltage line separately, detecting whether the voltages of the AB phase, the BC phase, and the AC phase are abnormal. If there is an abnormality, it means that the fault side is located in the line segment between the two transformers 3. If there is no abnormality, the transformer of the next line segment is started to perform a fault test on the next line segment. By setting up current transformers and voltage transformers, rapid detection of faults can be achieved.

[0046] Optionally, as shown in FIG2B , the signal generator 2 includes a communication module 23. The communication module 23 is connected to the background device via wireless communication.

[0047] For example, after the signal generator 2 receives the detected signal from the transformer 3, it can independently judge the detected signal and transmit the fault location and fault type to the background device through the communication module 23. The signal generator 2 can also input the detected signal from the transformer 3 into the background device through the communication module 23, and the background device will analyze and judge the fault location and fault type. The background device can be the main station of the power grid system. In order to facilitate the timely handling of faults by maintenance personnel, the main station of the power grid system can be bound to the mobile phone software. When the main station of the power grid system detects that a section of the high-voltage line has a fault, the fault type and fault location will be synchronized into the mobile phone software, prompting maintenance personnel near the fault section to carry out maintenance so that the fault can be handled quickly.

[0048] The present application also provides a 10KV distribution network high-voltage line injection fault location detection method, which is performed by the 10KV distribution network high-voltage line injection fault location detection device as described in any of the above items. Figure 3 is a circuit diagram of another 10KV distribution network high-voltage line injection fault location detection device provided in an embodiment of the present application. Referring to Figure 3, the detection method includes:

[0049] Control a signal generator 2 to send a detection signal to the corresponding line segment.

[0050] The tripped pole switches 1 are closed in sequence in a preset order, and the faulty line section and the fault type are determined based on the circuit parameters detected by the multiple mutual inductors 3 .

[0051] For example, when a high-voltage line fault occurs, the pole-mounted switches 1 for the entire section of the line on the fault side are disconnected, and the signal generator 2 is put into operation, closing the pole-mounted switches 1 sequentially in a preset order. The signal generator 2 sends a detection signal to the three phases A, B, and C of the high-voltage line on the fault side through the output side of the pole-mounted switch 1. The detection signals of the three phases A, B, and C of the high-voltage line are detected by the mutual inductors 3 associated with the signal generator 2 that sends the detection signal and the mutual inductors 3 associated with the pole-mounted switches 1 that are closed in sequence. The faulty line section and the fault type are determined based on the circuit parameters of the three phases A, B, and C of the high-voltage line detected by the multiple mutual inductors 3.

[0052] Continuing to refer to Figure 3, optionally, controlling a signal generator 2 to send a detection signal to a corresponding line segment includes: controlling the signal generator 2 corresponding to the pole-mounted switch 1 closest to the power transmission end of the high-voltage line among the tripped pole-mounted switches 1 to send a detection signal to the corresponding line segment.

[0053] For example, when a high-voltage line fails and trips, the signal generator 2 corresponding to the pole-mounted switch 1 closest to the power transmission end of the high-voltage line sends a detection signal to the three phases A, B, and C of the high-voltage line on the fault side. The mutual inductor 3 close to the fault side and the mutual inductor 3 close to the next line section on the fault side detect the detection signal and input the detected signal into the signal generator 2. The signal generator 2 or the background equipment judges the detected signal. If the data is abnormal, it means that the fault occurred in this line section, and the background equipment sends a fault signal to prompt the maintenance personnel to perform maintenance. If the data is normal, it means that the fault did not occur in this section, then the pole-mounted switch 1 that has been opened in the next line section away from the power transmission end will continue to be closed, and the judgment will continue until the line section where the fault is located is detected.

[0054] Continuing to refer to FIG3 , optionally, closing the tripped pole switches 1 in sequence in a preset order includes: closing the corresponding pole switches 1 in an order of being away from the power transmission end of the high-voltage line.

[0055] For example, when a high-voltage line fails and trips, the signal generator 2 corresponding to the pole-mounted switch 1 farthest from the power transmission end of the high-voltage line and the signal generator 2 close to the power consumption side send detection signals to the three phases A, B, and C of the high-voltage line on the fault side. The mutual inductor 3 close to the power consumption side and the mutual inductor 3 close to the next line section on the power consumption side detect the detection signal and input the detected signal into the signal generator 2. The signal generator 2 or the background equipment judges the detected signal. If the data is abnormal, it means that the fault occurred in this line section, and the background equipment sends a fault signal to prompt the maintenance personnel to perform maintenance. If the data is normal, it means that the fault did not occur in this line section, then the pole-mounted switch 1 that has been opened in the next line section close to the power transmission end will continue to be closed, and the judgment will continue until the line section where the fault is located is detected.

[0056] Optionally, determining the faulty line segment and the fault type based on circuit parameters detected by multiple transformers includes: after closing a pole switch 1, obtaining the circuit parameters detected by the corresponding transformer 3, and judging whether the line segment corresponding to the pole switch 1 is faulty and the fault type based on the circuit parameters.

[0057] For example, the circuit parameters detected by the mutual inductor 3 are transmitted to the signal generator 2 or the background device in real time. The signal generator 2 or the background device can analyze and compare the circuit parameters to determine the fault point and fault type.

[0058] Figure 4 is a circuit diagram of another 10KV distribution network high-voltage line injection-type fault location detection device provided in an embodiment of the present application. Referring to Figure 4 , determining whether the line segment corresponding to the pole-mounted switch is faulty and the type of fault based on circuit parameters includes: signal generator 2 sequentially sending a detection signal to each phase of the corresponding line segment. Transformer 3 and the transformer 3 of the adjacent line segment acquire current and voltage signals between the two segments; signal generator 2 receives the current and voltage signals and determines whether a phase-to-phase short circuit fault, line break fault, or single-phase grounding fault exists.

[0059] For example, the signal generator 2 sends detection signals to the three phases A, B, and C of the high-voltage lines in sequence, the mutual inductor 3 tests the signals of the three phases A, B, and C of the high-voltage lines, and feeds back the test results to the signal generator 2 to determine whether there is any abnormality in each of the three phases A, B, and C.

[0060] For example, when a fault occurs at the position shown in the figure, the signal generator 2 sends a detection signal to phase A. If I A1 =I A2 , it means that there is no fault in phase A and it continues to send detection signals to phase B; if I A1 ≠I A2 , and the induction in phase B is the same as I A1 Equal I B1 , at the same time, I A2 =I B2 =0, continue to send detection signal to phase B, if I B1 ≠I B2 , and the induction in phase A is the same as I B1 Equal I A1 , at the same time, I A2 =I B2 =0, continue to send detection signal to phase C, if I C1 =I C2 , it means that a phase-to-phase short circuit fault has occurred between phase A and phase B.

[0061] Among them, I A1 , I B1 , I C1 It is the current of the three phases A, B, and C of the high voltage line on the output side of the pole switch 1 detected by the transformer 3 corresponding to the signal generator 2. A2 , I B2 , I C2 It is the current of the three phases A, B and C of the high voltage line on the output side of the pole switch 1 detected by the transformer 3 corresponding to the pole switch 1 of the next line section of the signal generator 2.

[0062] When the signal generator 2 sends a detection signal to phase A, if I A1 ≠I A2 , and I A2=0, and continue to send detection signals to phase B. If I B1 =I B2 , it means that there is no fault in phase B, and it continues to send a detection signal to phase C. If I C1 =I C2 , it means that there is no fault in phase C. At this time, a line break fault occurs in phase A.

[0063] When the signal generator 2 sends a detection signal to phase A, if I A1 ≠I A2 , and I A2 =0 and I A1 It appears to be infinite and continues to send a detection signal to phase B. If I B1 =I B2 , it means that there is no fault in phase B, and it continues to send a detection signal to phase C. If I C1 =I C2 , it means that there is no fault in phase C. At this time, a single-phase grounding fault occurs in phase A.

[0064] In one embodiment, a 10KV distribution network high-voltage line injection-type fault location detection device is provided, comprising: a plurality of signal generators and a plurality of mutual inductors connected in a one-to-one correspondence with the plurality of signal generators;

[0065] Each of the signal generators is configured to correspond to a pole switch on the high-voltage line, and different signal generators correspond to different pole switches; wherein the high-voltage line is provided with multiple groups of pole switches, and the multiple groups of pole switches divide the high-voltage line into multiple line sections;

[0066] The output end of the signal generator is configured to be electrically connected to the output side of the corresponding pole-mounted switch; the detection end of the mutual inductor is configured to be electrically connected to the output side of the corresponding pole-mounted switch; the signal generator is configured to send a detection signal to the connected line segment when a line fault occurs, and the mutual inductor is configured to detect the circuit parameters of the line segment that receives the detection signal; the signal generator is also configured to receive the circuit parameters and determine the faulty line segment and the fault type based on the circuit parameters.

[0067] In one embodiment, the signal generator includes a control switch; the control switch is configured to be normally open when the output side of the pole switch to which the signal generator is connected is energized, and to be normally closed when the output side of the pole switch to which the signal generator is connected is de-energized; the signal generator is configured to start when the control switch is closed.

[0068] In one embodiment, the signal generator includes an emergency power supply, a charging end of the emergency power supply is electrically connected to an output side of a transformer correspondingly connected to the signal generator, and the emergency power supply is configured to input current or voltage into the high-voltage line.

[0069] In one embodiment, the transformer includes a current transformer and a voltage transformer;

[0070] The current transformer is configured to detect a current signal on the line segment that receives the detection signal, and the voltage transformer is configured to detect a voltage signal on the line segment that receives the detection signal.

[0071] In one embodiment, a 10KV distribution network high-voltage line injection-type fault location detection method is provided. As shown in FIG5 , the method is performed by a 10KV distribution network high-voltage line injection-type fault location detection device. The method includes:

[0072] S1. Close a pole switch and control a signal generator connected to the output side of the pole switch to send a detection signal to the connected line segment;

[0073] S2. Controlling a mutual inductor connected to the output side of the pole-mounted switch to detect circuit parameters of the line segment receiving the detection signal, wherein the mutual inductor is connected to the signal generator;

[0074] S3, controlling the signal generator to receive the circuit parameters, and determining the faulty line segment and the fault type according to the circuit parameters;

[0075] S4. Close multiple tripped pole switches in sequence in a preset order, and determine the faulty line section and fault type based on circuit parameters detected by a mutual inductor connected to the output side of each pole switch.

[0076] In one embodiment, controlling the signal generator connected to the output side of the pole-mounted switch to send a detection signal to the connected line segment includes:

[0077] In the pole-mounted switch that controls the tripping, the signal generator connected to the output side of the pole-mounted switch closest to the power transmission end of the high-voltage line sends the detection signal to the connected line segment.

[0078] In one embodiment, closing a plurality of tripped pole switches in a predetermined order comprises:

[0079] A plurality of tripped pole switches are closed in sequence in the order of being away from the power transmission end of the high-voltage line.

[0080] In one embodiment, controlling the signal generator connected to the output side of the pole-mounted switch to send a detection signal to the connected line segment includes:

[0081] Controlling the signal generator to send a detection signal to each phase line of the connected line segment;

[0082] The step of controlling the mutual inductor connected to the output side of the pole-mounted switch to detect the circuit parameters of the line segment receiving the detection signal, controlling the signal generator to receive the circuit parameters, and determining the line segment where the fault occurs and the type of the fault according to the circuit parameters includes:

[0083] The mutual inductor connected to the output side of the pole-mounted switch and the mutual inductor of the adjacent line segment detect the circuit parameters of the line segment that receives the detection signal, and obtain the current signal and voltage signal of the line segment that receives the detection signal;

[0084] The signal generator is controlled to receive the current signal and the voltage signal, and judge whether a fault occurs in the line segment and the type of the fault according to the current signal and the voltage signal. The fault type includes a phase-to-phase short circuit fault, a line break fault or a single-phase grounding fault.

[0085] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the multiple steps described in this application can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of this application can be achieved. This is not limited herein.

Claims

1. A 10KV distribution network high voltage line injection type fault location detection device, comprising: A plurality of signal generators and a plurality of mutual inductors connected to the plurality of signal generators in a one-to-one correspondence; Each of the signal generators is configured to correspond to a pole switch on the high-voltage line, and different signal generators correspond to different pole switches; wherein a plurality of pole switches are provided on the high-voltage line, and the plurality of pole switches divide the high-voltage line into a plurality of line sections; The output end of the signal generator is configured to be electrically connected to the output side of the corresponding pole switch; the detection end of the mutual inductor is configured to be electrically connected to the output side of the corresponding pole switch; the signal generator is configured to send a detection signal to the connected line segment when a line fault occurs, and the mutual inductor is configured to detect the circuit parameters of the line segment that receives the detection signal; the signal generator is also configured to receive the circuit parameters and determine the faulty line segment and the fault type based on the circuit parameters.

2. The device according to claim 1, wherein: The signal generator includes a control switch; the control switch is configured to be normally open when the output side of the pole switch connected to the signal generator is energized, and normally closed when the output side of the pole switch connected to the signal generator is de-energized; the signal generator is configured to start when the control switch is closed.

3. The device according to claim 1 or 2, wherein: The signal generator comprises an emergency power supply, a charging end of the emergency power supply is electrically connected to an output side of a transformer correspondingly connected to the signal generator, and the emergency power supply is configured to input current or voltage into the high voltage line.

4. The device according to claim 1, wherein: The mutual inductor comprises a current mutual inductor and a voltage mutual inductor; The current transformer is configured to detect a current signal on the line segment that receives the detection signal, and the voltage transformer is configured to detect a voltage signal on the line segment that receives the detection signal.

5. The device according to any one of claims 1 to 4, wherein: The signal generator includes a communication module; the communication module is configured to be connected to a background device via wireless communication.

6. A 10KV distribution network high-voltage line injection fault location detection method, which is performed by the 10KV distribution network high-voltage line injection fault location detection device according to any one of claims 1 to 5; the detection method comprises: Closing a pole switch, and controlling a signal generator connected to an output side of the pole switch to send a detection signal to the connected line segment; Controlling a mutual inductor connected to the output side of the pole switch to detect a circuit parameter of the line segment receiving the detection signal, wherein the mutual inductor is connected to the signal generator; Controlling the signal generator to receive the circuit parameters, and determining the line segment where the fault occurs and the fault type according to the circuit parameters; A plurality of tripped pole switches are closed in sequence in a preset order, and the faulty line section and the fault type are determined based on circuit parameters detected by a mutual inductor connected to the output side of each pole switch.

7. The method according to claim 6, wherein: The step of controlling the signal generator connected to the output side of the pole-mounted switch to send a detection signal to the connected line segment comprises: In the pole-mounted switch that controls the tripping, the signal generator connected to the output side of the pole-mounted switch closest to the power transmission end of the high-voltage line sends the detection signal to the connected line section.

8. The method according to claim 6, wherein: The method of closing a plurality of tripped pole switches in a preset order comprises: A plurality of tripped pole switches are closed in sequence in an order of being away from the power transmission end of the high voltage line.

9. The method according to claim 6 or 8, wherein: The step of controlling the signal generator connected to the output side of the pole-mounted switch to send a detection signal to the connected line segment comprises: Controlling the signal generator to send a detection signal to each phase line of the connected line segment; The method of controlling the transformer connected to the output side of the pole-mounted switch to detect the circuit parameters of the line segment receiving the detection signal, controlling the signal generator to receive the circuit parameters, and determining the line segment where the fault occurs and the fault type according to the circuit parameters, includes: The mutual inductor connected to the output side of the pole switch and the mutual inductor of the adjacent line segment detect the circuit parameters of the line segment receiving the detection signal, and obtain the current signal and voltage signal of the line segment receiving the detection signal; The signal generator is controlled to receive the current signal and the voltage signal, and judge whether a fault occurs in the line section and the type of the fault according to the current signal and the voltage signal. The type of fault includes a phase-to-phase short circuit fault, a line break fault or a single-phase grounding fault.

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