A ground fault section positioning method, device and electronic equipment

Abstract

The application discloses a grounding fault interval positioning method and device and electronic equipment, wherein a first fault interval is determined according to a zero sequence signal collected by a terminal of a main station system; a main trunk line of the first fault interval is segmented and processed by using a dichotomy method to obtain a first power supply side line and a first load side line; an outgoing switch trial power supply operation is performed on the first power supply side line, a fault line section is determined according to a result of the outgoing switch trial power supply operation, and a second fault interval is obtained; a branch isolation method and a power supply side power supply recovery method are adopted to determine a third fault interval according to a fault line of the second fault interval; and according to a topology of a line in the third fault interval, an area without a branch device in the third fault interval is isolated and recovered for power supply in stages, and a fourth fault interval is determined; the network advantage of a power distribution network can be fully utilized to determine a specific grounding position of a line on site, and the positioning is accurate. The embodiment of the application can be widely applied to the technical field of fault positioning of a power distribution system.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power distribution system fault positioning, and in particular to a grounding fault interval positioning method, device and electronic equipment. BACKGROUND

[0002] With the continuous increase of power load, the scale construction of urban power grid continues to expand, the cable length of overhead lines continues to grow, the power transmission system becomes more and more complex, and the ground capacitance current of 10kV system transmission line increases continuously, which causes pressure on the power transmission safety of power grid. In order to guarantee the power transmission safety of power distribution network and fully utilize the network advantage of power distribution network to play the self-healing function of power distribution automation system, the power distribution automation system emerges as the times require.

[0003] The current power distribution automation system mainly locates the fault interval by collecting the grounding fault zero sequence signal sent by the terminal. When locating the grounding fault interval, there are problems such as inaccurate actual fault interval positioning and incorrect fault de-powering positioning, which may cause the opposite line to trip during fault self-healing, resulting in the problem of fault occurring in the non-fault line. In addition, the current field line terminal does not have the ability to determine the specific position, which has a certain influence on the maintenance efficiency of the power grid. SUMMARY

[0004] Therefore, the embodiments of the present application provide a grounding fault interval positioning method, device and electronic equipment with high positioning accuracy.

[0005] An aspect of the embodiments of the present application provides a grounding fault interval positioning method, device and electronic equipment, which comprises the following steps: determining a first fault interval according to the zero sequence signal collected by the terminal of the master station system; using the dichotomy to segment the main line of the first fault interval to obtain a first power supply side line and a first load side line; performing an outgoing switch trial power operation on the first power supply side line, determining a fault line section according to the result of the outgoing switch trial power operation, and obtaining a second fault interval; using the branch isolation method and the power supply side recovery power supply method to determine a third fault interval according to the fault line of the second fault interval; and according to the topology of the line in the third fault interval, performing step-by-step isolation and recovery power supply on the area without branch equipment in the third fault interval, and determining a fourth fault interval.

[0006] Optionally, the method further comprises: according to the second fault interval, determining a third fault interval by using a branch isolation method and a power supply side power restoration method, including: in the second fault interval, searching for a branch device from a second power supply side line to a second load side line; wherein the second power supply side line is a line connected to a power supply in the second fault interval, and the second load side line is a line connected to a load in the second fault interval; when the branch device is found, starting all branch switches to isolate the branch device; obtaining a trip switch of the second power supply side line in a main line of the second fault interval, and starting to perform a power supply test from the second power supply side line to the second load side line in the order of the branch switches; dividing the second load side line in which the branch switch fails to supply power into the third fault interval.

[0007] Optionally, the method further comprises: according to the second fault interval, determining a third fault interval by using a branch isolation method and a power supply side power restoration method, including: in the second fault interval, searching for a branch device from a second power supply side line to a second load side line; wherein the second power supply side line is a line connected to a power supply in the second fault interval, and the second load side line is a line connected to a load in the second fault interval; when the branch device is found, starting all branch switches to isolate the branch device; obtaining a trip switch of the second power supply side line in a main line of the second fault interval, and starting to perform a power supply test from the second power supply side line to the second load side line in the order of the branch switches; dividing the second load side line in which the branch switch fails to supply power into the third fault interval.

[0008] Optionally, the method further comprises: according to the second fault interval, determining a third fault interval by using a branch isolation method and a power supply side power restoration method, including: in the second fault interval, searching for a branch device from a second power supply side line to a second load side line; wherein the second power supply side line is a line connected to a power supply in the second fault interval, and the second load side line is a line connected to a load in the second fault interval; when the branch device is found, starting all branch switches to isolate the branch device; obtaining a trip switch of the second power supply side line in a main line of the second fault interval, and starting to perform a power supply test from the second power supply side line to the second load side line in the order of the branch switches; dividing the second load side line in which the branch switch fails to supply power into the third fault interval.

[0009] Optionally, the method further comprises: according to the second fault interval, determining a third fault interval by using a branch isolation method and a power supply side power restoration method, including: in the second fault interval, searching for a branch device from a second power supply side line to a second load side line; wherein the second power supply side line is a line connected to a power supply in the second fault interval, and the second load side line is a line connected to a load in the second fault interval; when the branch device is found, starting all branch switches to isolate the branch device; obtaining a trip switch of the second power supply side line in a main line of the second fault interval, and starting to perform a power supply test from the second power supply side line to the second load side line in the order of the branch switches; dividing the second load side line in which the branch switch fails to supply power into the third fault interval.

[0010] Optionally, the method further comprises: when the fourth load side is restored to power supply, causing the fourth power side line to trip, then restoring the fourth power side line to the power supply mode of the transfer source, and the fault line stops the self-recovery process.

[0011] The embodiment of the present application further provides a ground fault interval positioning device, comprising: a first module, used for determining a first fault interval according to a zero sequence signal collected by a terminal of a master station system; a second module, used for performing segmentation processing on a main line of the first fault interval by using a dichotomy method, to obtain a first power side line and a first load side line; a third module, used for performing an outgoing switch trial power supply operation on the first power side line, and determining a fault line section according to a result of the outgoing switch trial power supply operation, to obtain a second fault interval; a fourth module, used for determining a third fault interval according to a fault line of the second fault interval by using a branch isolation method and a power side power supply recovery method; and a fifth module, used for performing step-by-step isolation and power supply recovery on a region without a branch device in the third fault interval according to a topology of a line in the third fault interval, and determining a fourth fault interval.

[0012] The embodiment of the present application further provides an electronic device, comprising a processor and a memory; the memory stores a program; and the program is executed by the processor to realize the method.

[0013] The embodiment of the present application further provides a computer readable storage medium, the storage medium stores a program, and the program is executed by a processor to realize the method.

[0014] The embodiment of the present application further provides a computer program product or a computer program, the computer program product or the computer program comprises computer instructions stored in a computer readable storage medium. A processor of a computer device can read the computer instructions from the computer readable storage medium, and the processor executes the computer instructions, so that the computer device executes the foregoing method.

[0015] The embodiment of the present application has the following beneficial effects: the embodiment of the present application determines a first fault interval according to a zero sequence signal collected by a terminal of a master station system; uses a dichotomy to perform segmented processing on a main line of the first fault interval, to obtain a first power supply side line and a first load side line; performs an outgoing line switch trial power supply operation on the first power supply side line, determines a fault line section according to a result of the outgoing line switch trial power supply operation, and obtains a second fault interval; further determines a fault line of the second fault interval by using a branch isolation method and a power supply side power supply recovery method, to obtain a third fault interval; according to a topology of a line in the third fault interval, performs step-by-step isolation and power supply recovery on a region without a branch device in the third fault interval, to further determine a fourth fault interval; the embodiment of the present application combines a grounding fault zero sequence signal, a switch closing and opening remote signal, and a master station isolation algorithm to complete fault positioning, can fully utilize a network advantage of a power distribution network, accurately determines a specific grounding position of a line in the field, and improves reliability of power supply of the power distribution network and power grid maintenance efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings.

[0017] Figure 1 is a method step flow chart provided by the embodiment of the present application;

[0018] Figure 2 is a step-by-step isolation method line topology diagram provided by the embodiment of the present application. DETAILED DESCRIPTION

[0019] In order to make the objects, technical solutions and advantages of the present application more clear, the following further describes the present application in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0020] In view of the problem that the actual fault interval positioning is not accurate in the current power distribution automation system, the fault may be incorrectly positioned, and the current field line terminal does not have the ability to determine the specific position, embodiments of the present application provide a grounding fault interval positioning method, comprising: determining a first fault interval according to a zero sequence signal collected by a master station system terminal; using a dichotomy method, segmenting a main line of the first fault interval to obtain a first power supply side line and a first load side line; performing an outgoing switch trial power operation on the first power supply side line, determining a fault line section according to a result of the outgoing switch trial power operation, and obtaining a second fault interval; using a branch isolation method and a power supply side power recovery method, determining a third fault interval according to a fault line of the second fault interval; and according to a topology of a line in the third fault interval, performing step-by-step isolation and power recovery on a region without a branch device in the third fault interval, and determining a fourth fault interval.

[0021] Specifically, referring to Figure 1 , Figure 1 is a method step flowchart provided by the embodiments of the present application, and the grounding fault interval positioning method comprises but is not limited to steps S100-S500. Before a specific description is made, it should be noted that the device used in the outgoing line interval of the power transmission line has two switches, which are divided into a power supply side and a load side; wherein, the side of current input is the power supply side, and the side of current output is the load side; it can be understood that the device used in the outgoing line interval can be a switch. The power supply side line and the load side line described in the embodiments of the present application can be lines extending to the power supply side and the load side based on the switch.

[0022] The step S100 will be described below:

[0023] S100, determining a first fault interval according to a zero sequence signal collected by a master station system terminal.

[0024] Specifically, when there is a grounding fault in the circuit, a zero sequence signal will be generated in the circuit, and the master station system determines an initial fault range according to the collected zero sequence signal, and takes the initial fault range as the first fault interval; wherein, the zero sequence signal comprises but is not limited to zero sequence current, zero sequence voltage and zero sequence power.

[0025] The step S200 will be described in detail below:

[0026] S200, using a dichotomy method, segmenting a main line of the first fault interval to obtain a first power supply side line and a first load side line.

[0027] Specifically, referring to Figure 1The method step flow chart of the method step flow chart is divided into two parts of the fault area determination part, the first fault interval is segmented and processed using the bisection method, and the first power supply side line and the first load side line are obtained, including but not limited to steps S210-S230. The segmented processing method using bisection method can restore power supply of a part of power users.

[0028] S210, obtain the number of all automation switches in the main line, and determine the position of the sectionalizing switch by taking the obtained number of automation switches as an integer.

[0029] Specifically, after the fault line is tripped for the first time, the bisection method is started to judge the fault line, and it is judged whether there is a sectionalizing switch in the main line. When there is a sectionalizing switch, the number of all automation switches in the main line is obtained. It should be noted that the main path is the path with the most automation switches in the line; the obtained number of automation switches is taken as an integer to determine the position of the sectionalizing switch. For example, if the number of automation switches is n, the position k of the sectionalizing switch is:

[0030] k=n / 2

[0031] If the calculated k value is not an integer, rounding operation is performed. It should be noted that the rounding operation can be upward rounding or downward rounding.

[0032] S220, remotely control the sectionalizing switch by remote signaling, and open the sectionalizing switch to divide the main line of the first fault interval into two sections.

[0033] Specifically, the sectionalizing switch is remotely controlled by remote signaling, that is, the sectionalizing switch is remotely controlled, so that the sectionalizing switch is opened to divide the main line of the first fault interval into two sections. For the switch that fails to be remotely controlled by remote signaling, manual processing can be performed.

[0034] S230, after the sectionalizing switch is opened, the line connected to the power supply on one side is marked as the first power supply side line, and the line connected to the load on one side after the sectionalizing switch is opened is marked as the first load side line.

[0035] Specifically, the line connected to the power supply on one side after the sectionalizing switch is opened is marked as the first power supply side line, and the line connected to the load on one side after the sectionalizing switch is opened is marked as the first load side line, which is convenient for subsequent processing of the main line.

[0036] The description of step S200 ends here.

[0037] S300, performing an outgoing line switch trial power supply operation on the first power supply side line, and determining a fault line section according to a result of the outgoing line switch trial power supply operation, to obtain a second fault interval.

[0038] Specifically, the outgoing line switch trial power supply operation is performed on the first power supply side line. When the trial power supply is successful, it is determined that the first power supply side line has no fault, and the fault area is the first load side line, and the obtained second fault interval is the first load side line. When the trial power supply fails, it is determined that the first power supply side line has a fault, and the obtained second fault interval is the first power supply side line.

[0039] S400, using a branch isolation method and a power supply side power supply recovery method to determine a third fault interval according to a fault line of the second fault interval.

[0040] Specifically, the branch isolation method and the power supply side power supply recovery method are used to determine the third fault interval according to the fault line of the second fault interval, which is beneficial to further narrow the fault range. Referring to the branch isolation fault area determination part of Figure 1 , step S400 includes but is not limited to steps S410-S440:

[0041] S410, searching for a branch device from a second power supply side line to a second load side line in the second fault interval; wherein the second power supply side line is a line connected to a power supply on one side in the second fault interval, and the second load side line is a line connected to a load on one side in the second fault interval.

[0042] Specifically, the branch device is searched from the second power supply side line to the second load side line in the second fault interval. If there is no branch device in the second fault interval, step S400 is skipped and step S500 is performed.

[0043] S420, when the branch device is found, starting all branch switches to isolate the branch device.

[0044] Specifically, when the branch device is found, all branch switches are started to isolate the branch device. The starting of all branch switches means that all branch switches are tripped, so that each branch switch is in an open circuit state, circuit isolation is performed, and the influence on the fault interval determination is avoided.

[0045] S430, obtaining a trip switch of the second power supply side line in a main line of the second fault interval, and starting the trial power supply operation from the second power supply side line to the second load side line in the order of the branch switches.

[0046] Specifically, referring to Figure 1The branch isolation fault area determination section obtains the tripped switches on the second power supply side of the main line in the second fault section. Starting from the second power supply side line and proceeding to the second load side line, the test power supply operation is completed in sequence according to the branch switches. The specific process is as follows: determine the first branch switch in sequence, close the power supply side of the branch switch, and test power supply to the line. It can be understood that closing the power supply side of the branch switch means performing a power supply side switch closing operation. If the line trips after the power supply side is closed and power is supplied, it indicates that there is a faulty line in the load side line of the branch switch. If there are other branch lines in the load side line of the branch switch, the above process is continued for the other branch lines until there are no branch lines in the load side line controlled by the processed branch switch, and the load side line is marked as a power supply failure line.

[0047] Perform step S430 as described above until all branch lines have been processed.

[0048] S440. The second load-side line where the branch switch that failed to supply power is located is divided into the third fault zone.

[0049] Specifically, the second load-side line where all the branch switches that failed to supply power in step S430 are located is divided into the third fault zone. It should be noted that the second load-side line where all the branch switches that failed to supply power are located is the load-side line controlled by each branch switch that failed to supply power.

[0050] The description of step S400 ends here.

[0051] S500. Based on the topology of the lines in the third fault section, power supply is restored to the areas without branch equipment in the third fault section through step-by-step isolation, and the fourth fault section is determined.

[0052] Specifically, refer to Figure 1 The step-by-step fault area determination section, based on the line topology within the third fault section, performs step-by-step isolation and power restoration on areas without branch equipment within the third fault section, and determines the fourth fault section, which is the final located fault area. Determining the fourth fault section facilitates notifying maintenance personnel to perform fault repair. Step S500 includes, but is not limited to, steps S510 to S540:

[0053] S510. In the third fault interval, locate the automatic switch from the trip switch to the third load side line; wherein, the third load side line is the line on the side of the load connected based on the trip switch in the third fault interval.

[0054] Specifically, in the third fault interval, an automation switch is found from the trip switch to a third load side line, wherein the third load side line is a side line connecting a load based on the trip switch in the third fault interval. This is conducive to processing the fault line. According to the description of the above step S400, it can be understood that there is no branch line in the third fault interval.

[0055] S520, when the automation switch is found, performing a line step-by-step isolation operation and a power-on operation on the third power source side line.

[0056] Specifically, when the automation switch is found, the power-on operation on the third power source side line is performed by the line step-by-step isolation operation. The specific process is that when the first automation switch in the third fault interval is found, all automation switches except the first automation switch are started to be tripped, the circuit is isolated, and the third fault interval is powered on. Referring to Figure 2 , Figure 2 is a line topology graph provided by the embodiment of the present application. It is assumed that the trip switch is DL3, i.e., the third fault interval is the branch where the switch DL3 is located. First, DL4 is isolated, the switch DL4 is tripped, the switch DL3 is closed, and the third fault interval is powered on. It should be noted that Figure 2 The number in represents the serial number of the circuit breaker switch.

[0057] S530, marking the power-on successful area as a non-fault interval; and dividing the area causing the circuit breaker to trip after power-on into a fourth fault interval.

[0058] Specifically, the power-on successful area is marked as a non-fault interval, which is conducive to restoring power supply to non-fault line power users after fault positioning. The area causing the circuit breaker to trip after power-on is divided into a fourth fault interval.

[0059] The above steps S520-S540 are repeated, and the fourth fault interval obtained is the final fault area positioned. Determining the fourth fault interval is conducive to notifying maintenance personnel to maintain the fault line.

[0060] Through the above steps S100-S500, the power line grounding fault can be effectively and accurately positioned, the reliability of power distribution network power supply is improved, and at the same time, the power supply of part of the power users is restored in the process of fault positioning, the waiting time of the power users is reduced, and the maintenance efficiency is improved.

[0061] S600, according to the fourth fault interval, restoring power supply to the remaining non-fault interval.

[0062] Specifically, according to the fourth fault interval, the power supply of the remaining non-fault interval is restored, the ground fault self-healing is completed, and the power user experience is improved.

[0063] S700, when the fourth load side is restored to power supply, the fourth power supply side line trip is caused, the fourth power supply side line transfer source power supply mode is restored, and the fault line stops the self-healing process.

[0064] Specifically, referring to the non-fault area power supply recovery part of Figure 1 When the fourth load side is restored to power supply, the fourth power supply side line trip is caused, the fourth power supply side line transfer source power supply mode is restored, and the fault line stops the self-healing process. If the fourth power supply side line does not trip, the self-healing is ended.

[0065] Embodiments of the present application also provide a ground fault interval positioning device, comprising: a first module for determining a first fault interval according to a zero sequence signal collected by a terminal of a master station system; a second module for segmenting a main line of the first fault interval using a dichotomy method to obtain a first power supply side line and a first load side line; a third module for performing an outgoing switch trial power supply operation on the first power supply side line, determining a fault line section according to a result of the outgoing switch trial power supply operation, and obtaining a second fault interval; a fourth module for determining a third fault interval according to a fault line of the second fault interval using a branch isolation method and a power supply side power supply recovery method; and a fifth module for performing step-by-step isolation and power supply recovery on an area without branch equipment in the third fault interval according to a topology of a line in the third fault interval, and determining a fourth fault interval.

[0066] Embodiments of the present application also provide an electronic device comprising a processor and a memory; the memory stores a program; and the program is executed by the processor to implement the method described above.

[0067] Embodiments of the present application also provide a computer readable storage medium, the storage medium stores a program, and the program is executed by a processor to implement the method described above.

[0068] Embodiments of the present application have the following beneficial effects:

[0069] 1. The ground fault zero sequence signal, switch closing and opening remote signaling, and master station isolation algorithm are combined to complete fault positioning, the network advantage of the power distribution network can be fully utilized, the specific ground position of the line on site can be accurately determined, and the reliability of power distribution network power supply is improved.

[0070] 2. The power supply recovery of part of power users is completed in the process of fault positioning, the waiting time of power users is reduced, and the maintenance efficiency is improved.

[0071] The following is an application scenario of an embodiment of the present application:

[0072] When a grounding fault occurs in a power transmission line, a grounding fault interval positioning device determines a first fault interval according to a zero sequence signal collected by a terminal of a main station system, calls a circuit topology graph of the first fault interval, uses a dichotomy to calculate a sectionalizing switch of a main line, remotely controls the sectionalizing switch to be in an open state, so that a first power supply side line and a first load side line are obtained. The grounding fault interval positioning device remotely controls a circuit device, performs a trial power supply operation on an outgoing switch of the first power supply side line, determines a fault line section according to a result of the trial power supply operation, and obtains a second fault interval. A branch isolation method and a power supply side power supply recovery method are used to determine a third fault interval of the second fault interval line, so as to further narrow the fault range. According to a topology of a line in the third fault interval, a region without a branch is isolated and power supply is recovered step by step to determine a fourth fault interval. A program in the grounding fault interval positioning device stores the fourth fault interval data in a database, which is used to notify a maintenance personnel to arrive at a site for maintenance. Further, the circuit device controls power supply recovery of a remaining non-fault interval according to the fourth fault interval. When the fourth load side is recovered to cause the fourth power supply side line to trip, a power supply mode of the fourth power supply side line is recovered, the fault line stops self-healing processing, and if the fourth power supply side line does not trip, self-healing is ended.

[0073] It should be noted that the "first", "second", "third", "fourth" and the like described herein are merely used to distinguish the same names, and are not used to limit the order of steps of the embodiments of the present application.

[0074] In some alternative embodiments, the functions / operations mentioned in the block diagram can not occur in the order mentioned in the operation diagram. For example, depending on the functions / operations involved, two blocks shown in succession can actually be executed substantially simultaneously with each other, or the blocks can sometimes be executed in reverse order. In addition, the embodiments presented and described in the flowcharts of the present application are provided by way of example, and the purpose is to provide a more comprehensive understanding of the technology. The disclosed method is not limited to the operations and logical flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and in which sub-operations described as part of larger operations are independently executed.

[0075] Furthermore, although the present application is described in the context of functional modules, it is to be understood that one or more of the described functions and / or features can be integrated in a single physical device and / or software module, or one or more functions and / or features can be implemented in separate physical devices or software modules. It will also be appreciated that detailed discussion of the actual implementation of each module is not necessary to an understanding of the application. Rather, the actual implementation of the modules, in combination with their attributes, functions, and internal relationships, are to be understood within the context of the devices disclosed herein. Thus, those skilled in the art with access to patents, scientific journals, and other public sources known by those skilled in the art will be able, using ordinary skill, to practice the application as set forth in the claims without undue experimentation. It is also to be understood that the specific concepts disclosed are merely illustrative and that the scope of the present application is to be determined by the entire scope of the claims, along with all equivalents of the claims, and that the claims are to be accorded their broadest interpretation under the patent statutes.

[0076] If the functions are implemented in software, the functions can be stored in or implemented as one or more computer program products, which can be incorporated into a computer-readable medium for use by or in connection with an apparatus, method, or system as described herein. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, an article of manufacture, or a computer program product. The computer-readable medium can be a non-transitory computer-readable medium. The computer-readable medium can be a computer-readable non-transitory storage medium. The computer-readable medium can be a tangible computer-readable medium.

[0077] Logic and / or steps represented in flow diagrams and / or otherwise described herein, for example, can be embodied in non-transitory computer-readable media, which can direct one or more computing devices to function in a particular manner, such as execute instructions, processes, and / or programs stored in the non-transitory computer-readable media. The non-transitory computer-readable media can be used to store data, computer program instructions, and / or other information.

[0078] It should be understood that aspects of the application can be implemented in hardware, software, firmware or a combination thereof. In the above embodiments, various steps or methods can be implemented in software or firmware which is stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, and in another embodiment, any of the following techniques can be used to implement the hardware used to implement the described functions: discrete logic circuitry having logic gates for implementing logic functions upon data signals, application specific integrated circuits having logic gates, field programmable gate arrays (FPGAs), and so on, or a combination thereof.

[0079] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in one or more embodiments or examples.

[0080] Although embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, alternatives and variations can be made to the embodiments without departing from the principles and spirit of the application, and the scope of the present application is defined by the claims and their equivalents.

[0081] The above is a specific description of the preferred embodiments of the present application, but the present application is not limited to the described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A method of ground fault section location, characterized by, The method comprises the following steps: determining a first fault interval according to a zero sequence signal collected by a terminal of a master station system; segmenting a main line of the first fault interval by using a dichotomy method to obtain a first power supply side line and a first load side line; performing an outgoing switch trial power supply operation on the first power supply side line, and determining a fault line section according to a result of the outgoing switch trial power supply operation to obtain a second fault interval; determining a third fault interval according to a fault line of the second fault interval by using a branch isolation method and a power supply side power supply recovery method; performing step-by-step isolation and power supply recovery on a region without a branch device in the third fault interval according to a topology of a line in the third fault interval, and determining a fourth fault interval; the step of segmenting the main line of the first fault interval by using the dichotomy method to obtain the first power supply side line and the first load side line comprises the following steps: obtaining a number of all automatic switches in the main line, and determining a position of a segmentation switch by taking an integer part of the number of the automatic switches; remotely controlling the segmentation switch by using remote signaling to make the segmentation switch trip, and dividing the main line of the first fault interval into two segments; marking a side of the line connected to a power supply after the segmentation switch trips as the first power supply side line, and marking a side of the line connected to a load after the segmentation switch trips as the first load side line; the step of determining the third fault interval according to the fault line of the second fault interval by using the branch isolation method and the power supply side power supply recovery method comprises the following steps: in the second fault interval, searching for a branch device from a second power supply side line to a second load side line; the second power supply side line is a side of the line connected to the power supply in the second fault interval, and the second load side line is a side of the line connected to the load in the second fault interval; when the branch device is found, starting all branch switches to isolate the branch device; obtaining a trip switch of the second power supply side line in a main line of the second fault interval, and performing a trial power supply operation on the second load side line in the order of the branch switches starting from the second power supply side line; dividing the second load side line in which the branch switch fails to supply power into a third fault interval.

2. The method of claim 1, wherein, the step of performing step-by-step isolation and power supply recovery on the region without the branch in the third fault interval according to the topology of the line in the third fault interval, and further determining the fourth fault interval comprises the following steps: in the third fault interval, searching for an automatic switch from the trip switch to a third load side line; the third load side line is a side of the line connected to the load in the third fault interval; when the automatic switch is found, performing a line step-by-step isolation operation and a trial power supply operation on a third power supply side line; marking a region in which power supply is successful as a non-fault interval; and dividing a region in which a circuit breaker trips after power supply into a fourth fault interval.

3. The method of claim 1, wherein, the method further comprises the following steps: According to the fourth fault interval, the fourth power supply side line of the remaining non-fault interval is restored to supply power, and the fourth load side line is restored to supply power by using the fourth power supply side line transfer source; wherein the fourth power supply side line is a side line connected to the power supply in the non-fault interval, and the fourth load side line is a side line connected to the load in the non-fault interval.

4. The method of claim 3, wherein, The method further comprises: When the fourth load side line is restored to supply power and causes the fourth power supply side line to trip, the fourth power supply side line transfer source is restored to supply power, and the fault line stops the self-healing process.

5. An apparatus for implementing the method of locating a ground fault section according to any one of claims 1 to 4, characterized in that, Comprise: The first module is configured to determine a first fault interval according to a zero sequence signal collected by a terminal of a master station system; The second module is configured to segment the main line of the first fault interval by using a dichotomy method to obtain a first power supply side line and a first load side line; The third module is configured to perform an outgoing switch trial power supply operation on the first power supply side line, and determine a fault line section according to a result of the outgoing switch trial power supply operation to obtain a second fault interval; The fourth module is configured to determine a third fault interval according to a fault line of the second fault interval by using a branch isolation method and a power supply side power supply restoration method; The fifth module is configured to isolate and restore power supply to an area without branch equipment in the third fault interval according to a topology of a line in the third fault interval, and determine a fourth fault interval.

6. An electronic device, comprising: Comprise a processor and a memory; The memory stores a program; The program is executed by the processor to realize the method of any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that, The computer readable storage medium stores a program, and the program is executed by the processor to realize the method of any one of claims 1 to 4.

8. A computer program product, characterised in that, Comprise a computer program, and the computer program is executed by the processor to realize the method of any one of claims 1 to 4.

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