Directional traveling wave based fault location method, system and apparatus for distribution lines

Abstract

The application provides a power distribution line fault positioning method, system and device based on directional traveling wave, a plurality of monitoring terminals are arranged on the power distribution line, the method comprises the following steps: numbering the plurality of monitoring terminals and grouping the plurality of monitoring terminals to form a plurality of monitoring groups; determining the main terminal of each monitoring group according to the number of the monitoring terminals in each monitoring group; determining the directional traveling wave on the power distribution line according to the current traveling wave and the voltage traveling wave; determining the fault section of the power distribution line according to the type of the directional traveling wave of the main terminal in each monitoring group and the type of the directional traveling wave of all the monitoring terminals except the main terminal in each monitoring group; and determining the fault position according to the initial traveling wave time information detected by all the monitoring terminals in the fault section. The application utilizes the traveling wave when the power distribution line is faulty to determine the specific position of the fault, improves the accuracy and economy of the power distribution line fault positioning, further shortens the fault searching time and guarantees the power supply reliability of the power distribution line.

Description

Technical Field

[0001] This invention relates to the field of power system fault detection and relay protection technology, and more specifically, to a method, system and device for locating faults in distribution lines based on directional traveling waves. Background Technology

[0002] The distribution network is a crucial hub connecting the transmission chain and power users, and its power supply reliability directly affects the user experience. Distribution network double-ended traveling wave ranging has high accuracy and is less affected by factors such as line operating mode, transition resistance, transformer transformation errors, and uneven distribution of line parameters along the corridor. It can quickly locate faults after they occur, reducing patrol time.

[0003] Many manufacturers have proposed dual-end traveling wave ranging solutions for distribution networks. A distribution network traveling wave ranging system based on the dual-end ranging principle consists of three parts: a monitoring terminal, a master station, and a power system synchronization clock. The monitoring terminal is installed on the distribution line and is responsible for acquiring and extracting current, voltage, and traveling wave signals, recording the arrival time of the initial traveling wave during a fault, and communicating with the master station. The monitoring terminal consists of current transformers, voltage transformers, a data acquisition and processing unit, a CPU (Central Processing Unit), a GPS (Global Positioning System), and a communication unit. The master station provides fault data display, analysis, and ranging functions. The power system synchronization clock provides accurate time information for the system.

[0004] The traveling wave ranging master station is responsible for fault data display, analysis, and ranging functions. Currently, most manufacturers deploy a centralized master station, uploading all terminal data to it. This results in data centralization, heavy load, and high traffic for the master station. There are also compatibility issues between the centralized master station and existing distribution automation master stations. One approach is to deploy the centralized master station separately from the existing distribution automation master station. The disadvantages of this approach are that the hardware resources of the two systems cannot be reused, increasing investment; and the terminals need to communicate with both master stations. Another approach is to integrate the centralized ranging master station into the existing distribution automation master station. The disadvantages of this approach are that it requires upgrading and modifying the existing distribution automation master station and often involves coordination issues between different manufacturers and software. Therefore, in practical applications, the deployment and integration of the traveling wave ranging master station need to be considered. Summary of the Invention

[0005] The present invention aims to at least solve the problems of economic efficiency and accurate fault location in power distribution lines.

[0006] Therefore, the first objective of this invention is to provide a method for fault location of power distribution lines based on directional traveling waves.

[0007] The second objective of this invention is to provide a power distribution line fault location system based on directional traveling waves.

[0008] The third objective of this invention is to provide a fault location device for power distribution lines based on directional traveling waves.

[0009] A fourth objective of this invention is to provide a storage medium.

[0010] The first aspect of the present invention provides a method for fault location of power distribution lines based on directional traveling waves. Multiple monitoring terminals are installed on the power distribution line. The method includes: numbering the multiple monitoring terminals and grouping them into multiple monitoring groups; determining the main terminal of each monitoring group based on the terminal number within each group; determining the directional traveling wave on the power distribution line based on current and voltage traveling waves; determining the fault section of the power distribution line based on the type of directional traveling wave at the main terminal within each monitoring group and the types of directional traveling waves at all monitoring terminals in each monitoring group (excluding the main terminal); and determining the fault location based on the initial traveling wave time information detected by all monitoring terminals in the fault section.

[0011] The fault location method for distribution lines based on directional traveling waves provided by this invention solves the problem of accurate fault location in distribution networks by setting up multiple monitoring terminals on the distribution line and utilizing the traveling waves when a fault occurs in the distribution line. This further shortens the fault finding time and improves the power supply reliability of the distribution line. Specifically, multiple monitoring terminals can be numbered and grouped to form multiple monitoring groups. Then, the master terminal in each monitoring group is determined according to the terminal number. The master terminal in each monitoring group can then communicate with the monitoring terminals in that group. After determining the fault section of the distribution line based on the type of directional traveling waves detected by the master terminal and the monitoring terminals in each group, it is not necessary for all monitoring terminals on the distribution line to communicate with the centralized master station, reducing the burden on the centralized master station and solving the problem of large communication data volume in the centralized ranging master station of the distribution network. Furthermore, since this application can also utilize the initial traveling wave time information detected by all monitoring terminals in the fault section to accurately locate the fault location, it facilitates rapid fault repair by personnel.

[0012] In addition, the fault location method for distribution lines based on directional traveling waves provided in this application may also have the following additional technical features:

[0013] In some embodiments, optionally, the step of determining the fault section of the distribution line based on the type of directional traveling wave of the main terminal in each monitoring group and the types of directional traveling waves of all monitoring terminals other than the main terminal in each monitoring group includes: determining the type of directional traveling wave of the main terminal in the monitoring group; if the type of directional traveling wave of the main terminal in the monitoring group is a reverse traveling wave, determining whether the fault location is within the monitoring group based on the directional traveling waves of all monitoring terminals other than the main terminal in the monitoring group; if the type of directional traveling wave of the main terminal in the monitoring group is a forward traveling wave, determining that the fault location is not within the monitoring group.

[0014] In this embodiment, the type of directional traveling wave of the main terminal within the monitoring group can be determined first. If the type of directional traveling wave of the main terminal within the monitoring group is a reverse traveling wave, data is requested from other monitoring terminals within the group. Based on the directional traveling waves of all monitoring terminals except the main terminal, it is determined whether the fault location is within the monitoring group. If the type of directional traveling wave of the main terminal within the monitoring group is a forward traveling wave, it is not necessary to determine the directional traveling waves of other monitoring terminals within the monitoring group, and it can be determined that the fault location is not within the monitoring group, thereby reducing the data processing burden.

[0015] In some embodiments, optionally, when the type of directional traveling wave of the main terminal in the monitoring group is a reverse traveling wave, the step of determining whether the fault location is within the monitoring group based on the directional traveling waves of all monitoring terminals other than the main terminal in the monitoring group includes: determining the type of directional traveling wave of all monitoring terminals other than the main terminal in the monitoring group; and determining that the fault location is within the monitoring group when the type of directional traveling wave of all monitoring terminals other than the main terminal in the monitoring group is a forward traveling wave.

[0016] In this embodiment, if the directional traveling wave of the main terminal within the monitoring group is a reverse traveling wave, the types of directional traveling waves of all monitoring terminals within the monitoring group, excluding the main terminal, can be determined. If the directional traveling waves of all monitoring terminals within the monitoring group, excluding the main terminal, are all positive traveling waves, the fault location can be determined to be within the monitoring group. This application utilizes directional traveling waves and monitoring terminals to determine the specific location of the fault, shortening the fault location time and improving the power supply reliability of the distribution line.

[0017] In some embodiments, optionally, the step of determining the fault location based on the initial traveling wave time information detected by all monitoring terminals in the fault section includes: obtaining the time when the initial wavefront of the traveling wave generated at the fault location arrives at the main terminal, denoted as the first moment; obtaining the time when the initial wavefront arrives at all monitoring terminals in the monitoring group except the main terminal, denoted as the second moment; obtaining the distance from the main terminal to the monitoring terminal and the propagation speed of the traveling wave; and determining the distance from the fault location to the main terminal in the monitoring group based on the first moment, the second moment, the distance from the main terminal to the monitoring terminal, and the propagation speed of the traveling wave.

[0018] In this embodiment, after determining which monitoring group the fault occurred in, the distance from the fault location to the main terminal within that monitoring group can also be specifically determined, facilitating rapid fault repair by staff. Specifically, the time when the initial wavefront of the traveling wave generated at the fault location reaches the main terminal within the monitoring group is first obtained, denoted as the first moment; the time when the initial wavefront reaches all monitoring terminals within the monitoring group is denoted as the second moment; the distance from the main terminal to each monitoring terminal and the propagation speed of the traveling wave are also obtained. Then, based on the first moment, the second moment, the distance from the main terminal to the monitoring terminals, and the propagation speed of the traveling wave, the distance from the fault location to the main terminal within the monitoring group is determined. Since each monitoring group may contain multiple monitoring terminals besides the main terminal, there will be multiple second moments and multiple distances from the main terminal to the monitoring terminals, resulting in multiple final distances. In this case, the maximum distance among these multiple distances can be determined as the distance from the fault location to the main terminal within the monitoring group.

[0019] In some embodiments, the step of numbering multiple monitoring terminals may optionally include: determining the main line and branch lines of the power distribution line; and numbering the multiple monitoring terminals based on the main line and branch lines.

[0020] In this embodiment, the monitoring terminals can be numbered according to the main line and the branch lines. Specifically, the main line is numbered first, and then the branch lines are numbered.

[0021] In some embodiments, the step of numbering multiple monitoring terminals may optionally include: determining the distance of multiple monitoring terminals to the power supply end or the load end; numbering the multiple monitoring terminals according to the distance of the monitoring terminals to the power supply end or the load end; wherein the number of the monitoring terminal closer to the power supply end is less than the number of the monitoring terminal farther from the power supply end, and the number of the monitoring terminal closer to the load end is greater than the number of the monitoring terminal farther from the load end.

[0022] In this embodiment, the numbering can be determined based on the distance of the monitoring terminal from the power source or the load. Among multiple monitoring terminals, the closer the monitoring terminal is to the power source, the smaller the number; conversely, the closer the monitoring terminal is to the load, the larger the number.

[0023] In some embodiments, the step of determining the master terminal of each monitoring group based on the number of the monitoring terminal in each monitoring group may include: obtaining the numbers of all monitoring terminals in each monitoring group; determining the monitoring terminal with the smallest number in each monitoring group; and determining the monitoring terminal with the smallest number as the master terminal.

[0024] In this embodiment, the master terminal can be determined based on its monitoring terminal number. Specifically, the monitoring terminal with the smallest number within each monitoring group is the master terminal of that monitoring group.

[0025] In some embodiments, the step of grouping multiple monitoring terminals to form multiple monitoring groups may include: obtaining the network topology of the power distribution line; and grouping the multiple monitoring terminals according to the network topology to form multiple monitoring groups.

[0026] In this embodiment, multiple monitoring terminals can be grouped according to the network topology of the power distribution lines to form multiple monitoring groups.

[0027] The second aspect of the present invention provides a distribution line fault location system based on directional traveling waves. Multiple monitoring terminals are installed on the distribution line. The distribution line fault location system based on directional traveling waves includes: a first determining module for numbering the multiple monitoring terminals and grouping them into multiple monitoring groups; a second determining module for determining the master terminal of each monitoring group based on the terminal number within each monitoring group; a third determining module for determining the directional traveling wave on the distribution line based on current traveling waves and voltage traveling waves; a first fault determining module for determining the fault section of the distribution line based on the type of directional traveling wave of the master terminal within each monitoring group and the types of directional traveling waves of all monitoring terminals other than the master terminal within each monitoring group; and a second fault determining module for determining the fault location based on the initial traveling wave time information detected by all monitoring terminals in the fault section.

[0028] According to the directional traveling wave-based power distribution line fault location system provided by the present invention, multiple monitoring terminals are installed on the power distribution line. The directional traveling wave-based power distribution line fault location system includes a first determining module, a second determining module, a third determining module, a first fault determining module, and a second fault determining module. The first determining module can number the multiple monitoring terminals and group them to form multiple monitoring groups. The second determining module can determine the main terminal of each monitoring group based on the number of the monitoring terminals within each monitoring group. The third determining module can determine the directional traveling wave on the power distribution line based on the current traveling wave and the voltage traveling wave. The first fault determining module can determine the fault section of the power distribution line based on the type of directional traveling wave of the main terminal in each monitoring group and the types of directional traveling waves of all monitoring terminals in each monitoring group other than the main terminal. The second fault determining module can determine the fault location based on the initial traveling wave time information detected by all monitoring terminals in the fault section. The power distribution line fault location system based on directional traveling wave provided by the present invention can determine the specific location of the fault by setting up multiple monitoring terminals on the power distribution line and using the traveling wave when the power distribution line fault occurs and the initial traveling wave time information, thereby shortening the fault search time and improving the power supply reliability of the power distribution line.

[0029] The third aspect of the present invention provides a power distribution line fault location device based on directional traveling wave, comprising: a memory and a processor, wherein the memory stores a program or instructions, and when the program or instructions are executed by the processor, the steps of the power distribution line fault location method based on directional traveling wave as described in any of the first aspects are implemented.

[0030] The distribution line fault location device based on directional traveling wave provided by the present invention includes a memory and a processor. The memory stores a program or instructions, and when the program or instructions are executed by the processor, they implement the steps of the distribution line fault location method based on directional traveling wave as described in any of the technical solutions of the first aspect. Since this distribution line fault location device based on directional traveling wave can implement the steps of the distribution line fault location method based on directional traveling wave as described in any of the technical solutions of the first aspect, the distribution line fault location device based on directional traveling wave provided by the present invention also possesses all the beneficial effects of the distribution line fault location method based on directional traveling wave as described in any of the technical solutions of the first aspect, which will not be elaborated further here.

[0031] The fourth aspect of the present invention provides a storage medium storing a program or instructions thereon, which, when executed, implements the steps of the power distribution line fault location method based on directional traveling wave as described in any of the first aspects.

[0032] According to the storage medium provided by the present invention, a program or instructions are stored thereon. When the program or instructions are executed, the steps of the distribution line fault location method based on directional traveling wave as described in any of the technical solutions of the first aspect are implemented. Since this storage medium can implement the steps of the distribution line fault location method based on directional traveling wave as described in any of the technical solutions of the first aspect, the storage medium provided by the present invention also possesses all the beneficial effects of the distribution line fault location method based on directional traveling wave as described in any of the technical solutions of the first aspect, which will not be elaborated further here.

[0033] Additional aspects and advantages of the invention will become apparent in the following description or may be learned by practice of the invention. Attached Figure Description

[0034] Figure 1 This is one of the flowcharts of a power distribution line fault location method based on directional traveling wave according to an embodiment of the present invention;

[0035] Figure 2 This is a second schematic flowchart of a power distribution line fault location method based on a directional traveling wave according to an embodiment of the present invention;

[0036] Figure 3 This is the third flowchart of a power distribution line fault location method based on directional traveling waves according to an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of traveling wave ranging according to an embodiment of the present invention;

[0038] Figure 5 This is a configuration diagram of a traveling wave ranging monitoring terminal according to an embodiment of the present invention;

[0039] Figure 6 This is one of the schematic diagrams of a power distribution line fault according to an embodiment of the present invention;

[0040] Figure 7 This is a second schematic diagram of a power distribution line fault according to an embodiment of the present invention;

[0041] Figure 8 This is a third schematic diagram of a power distribution line fault according to an embodiment of the present invention;

[0042] Figure 9 This is a fourth schematic diagram of a power distribution line fault according to an embodiment of the present invention;

[0043] Figure 10 This is the fifth schematic diagram of a power distribution line fault according to an embodiment of the present invention;

[0044] Figure 11 This is a sixth schematic diagram of a power distribution line fault according to an embodiment of the present invention;

[0045] Figure 12 This is one of the block diagrams of a power distribution line fault location system based on a directional traveling wave according to an embodiment of the present invention;

[0046] Figure 13 This is a second block diagram of a power distribution line fault location device based on a directional traveling wave according to an embodiment of the present invention. Detailed Implementation

[0047] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0048] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0049] The following reference Figures 1 to 13This invention describes a method, system, apparatus, and storage medium for fault location of power distribution lines based on directional traveling waves, according to some embodiments of the present invention.

[0050] In one embodiment according to this application, such as Figure 1 As shown, a method for fault location in distribution lines based on directional traveling waves is provided. Multiple monitoring terminals are installed on the distribution line. The method for fault location in distribution lines based on directional traveling waves includes:

[0051] S102, number the multiple monitoring terminals and group the multiple monitoring terminals to form multiple monitoring groups.

[0052] S104. Determine the main terminal of each monitoring group based on the number of the monitoring terminal within each monitoring group.

[0053] S106, determine the direction of the traveling wave on the power distribution line based on the traveling wave of the current and the traveling wave of the voltage.

[0054] S108, determine the fault section of the power distribution line based on the type of directional traveling wave of the main terminal in each monitoring group and the type of directional traveling wave of all monitoring terminals other than the main terminal in each monitoring group.

[0055] S110: Determine the fault location based on the initial traveling wave time information detected by all monitoring terminals in the faulty section.

[0056] The fault location method for distribution lines based on directional traveling waves provided by this invention solves the problem of accurate fault location in distribution networks by setting up multiple monitoring terminals on the distribution line and utilizing the traveling waves when a fault occurs in the distribution line. This further shortens the fault finding time and improves the power supply reliability of the distribution line. Specifically, multiple monitoring terminals can be numbered and grouped to form multiple monitoring groups. Then, the master terminal in each monitoring group is determined according to the terminal number. The master terminal in each monitoring group can then communicate with the monitoring terminals in that group. After determining the fault section of the distribution line based on the type of directional traveling waves detected by the master terminal and the monitoring terminals in each group, it is not necessary for all monitoring terminals on the distribution line to communicate with the centralized master station, reducing the burden on the centralized master station and solving the problem of large communication data volume difficulties for the centralized ranging master station in the distribution network. Furthermore, since this application can also utilize the initial traveling wave time information detected by all monitoring terminals in the fault section to accurately locate the fault location, it facilitates rapid fault repair by personnel.

[0057] In some embodiments, optionally, the step of determining the fault section of the distribution line based on the type of directional traveling wave of the main terminal in each monitoring group and the types of directional traveling waves of all monitoring terminals other than the main terminal in each monitoring group includes: determining the type of directional traveling wave of the main terminal in the monitoring group; if the type of directional traveling wave of the main terminal in the monitoring group is a reverse traveling wave, determining whether the fault location is within the monitoring group based on the directional traveling waves of all monitoring terminals other than the main terminal in the monitoring group; if the type of directional traveling wave of the main terminal in the monitoring group is a forward traveling wave, determining that the fault location is not within the monitoring group.

[0058] In this embodiment, the type of directional traveling wave of the main terminal within the monitoring group can be determined first. If the type of directional traveling wave of the main terminal within the monitoring group is a reverse traveling wave, data is requested from other monitoring terminals within the group. Based on the directional traveling waves of all monitoring terminals except the main terminal, it is determined whether the fault location is within the monitoring group. If the type of directional traveling wave of the main terminal within the monitoring group is a forward traveling wave, it is not necessary to determine the directional traveling waves of other monitoring terminals within the monitoring group, and it can be determined that the fault location is not within the monitoring group, thereby reducing the data processing burden.

[0059] In some embodiments, optionally, when the type of directional traveling wave of the main terminal in the monitoring group is a reverse traveling wave, the step of determining whether the fault location is within the monitoring group based on the directional traveling waves of all monitoring terminals other than the main terminal in the monitoring group includes: determining the type of directional traveling wave of all monitoring terminals other than the main terminal in the monitoring group; and determining that the fault location is within the monitoring group when the type of directional traveling wave of all monitoring terminals other than the main terminal in the monitoring group is a forward traveling wave.

[0060] In this embodiment, if the directional traveling wave of the main terminal within the monitoring group is a reverse traveling wave, the types of directional traveling waves of all monitoring terminals within the monitoring group, excluding the main terminal, can be determined. If the directional traveling waves of all monitoring terminals within the monitoring group, excluding the main terminal, are all positive traveling waves, the fault location can be determined to be within the monitoring group. This application utilizes directional traveling waves and monitoring terminals to determine the specific location of the fault, shortening the fault location time and improving the power supply reliability of the distribution line.

[0061] In some embodiments, optionally, the step of determining the fault location based on the initial traveling wave time information detected by all monitoring terminals in the fault section includes: obtaining the time when the initial wavefront of the traveling wave generated at the fault location arrives at the main terminal, denoted as the first moment; obtaining the time when the initial wavefront arrives at all monitoring terminals in the monitoring group except the main terminal, denoted as the second moment; obtaining the distance from the main terminal to the monitoring terminal and the propagation speed of the traveling wave; and determining the distance from the fault location to the main terminal in the monitoring group based on the first moment, the second moment, the distance from the main terminal to the monitoring terminal, and the propagation speed of the traveling wave.

[0062] In this embodiment, after determining which monitoring group the fault occurred in, the distance from the fault location to the main terminal within that monitoring group can also be specifically determined, facilitating rapid fault repair by staff. Specifically, the first moment when the initial wavefront of the traveling wave generated at the fault location reaches the main terminal within the monitoring group, the second moment when the initial wavefront reaches all monitoring terminals within the monitoring group, the distance from the main terminal to each monitoring terminal, and the propagation speed of the traveling wave are obtained. Then, based on the first moment, the second moment, the distance from the main terminal to the monitoring terminals, and the propagation speed of the traveling wave, the distance from the fault location to the main terminal within the monitoring group is determined. Since each monitoring group may contain multiple monitoring terminals besides the main terminal, there will be multiple second moments and multiple distances from the main terminal to the monitoring terminals, resulting in multiple final distances. In this case, the largest distance among these multiple distances can be determined as the distance from the fault location to the main terminal within the monitoring group.

[0063] In some embodiments, the step of numbering multiple monitoring terminals may optionally include: determining the main line and branch lines of the power distribution line; and numbering the multiple monitoring terminals based on the main line and branch lines.

[0064] In this embodiment, the monitoring terminals can be numbered according to the main line and the branch lines. Specifically, the main line is numbered first, and then the branch lines are numbered.

[0065] In some embodiments, the step of numbering multiple monitoring terminals may optionally include: determining the distance of multiple monitoring terminals to the power supply end or the load end; numbering the multiple monitoring terminals according to the distance of the monitoring terminals to the power supply end or the load end; wherein the number of the monitoring terminal closer to the power supply end is less than the number of the monitoring terminal farther from the power supply end, and the number of the monitoring terminal closer to the load end is greater than the number of the monitoring terminal farther from the load end.

[0066] In this embodiment, the numbering can be determined based on the distance of the monitoring terminal from the power source or the load. Among multiple monitoring terminals, the closer the monitoring terminal is to the power source, the smaller the number; conversely, the closer the monitoring terminal is to the load, the larger the number.

[0067] In some embodiments, the step of determining the master terminal of each monitoring group based on the number of the monitoring terminal in each monitoring group may include: obtaining the numbers of all monitoring terminals in each monitoring group; determining the monitoring terminal with the smallest number in each monitoring group; and determining the monitoring terminal with the smallest number as the master terminal.

[0068] In this embodiment, the master terminal can be determined based on its monitoring terminal number. Specifically, the monitoring terminal with the smallest number within each monitoring group is the master terminal of that monitoring group.

[0069] In some embodiments, the step of grouping multiple monitoring terminals to form multiple monitoring groups may include: obtaining the network topology of the power distribution line; and grouping the multiple monitoring terminals according to the network topology to form multiple monitoring groups.

[0070] In this embodiment, multiple monitoring terminals can be grouped according to the network topology of the power distribution lines to form multiple monitoring groups.

[0071] In one embodiment according to this application, such as Figure 2 As shown, a method for fault location in distribution lines based on directional traveling waves is provided. Multiple monitoring terminals are installed on the distribution line. The method for fault location in distribution lines based on directional traveling waves includes:

[0072] S202: Number multiple monitoring terminals and group them to form multiple monitoring groups.

[0073] S204. The main terminal of each monitoring group is determined according to the number of the monitoring terminal within each monitoring group.

[0074] S206, determine the direction of the traveling wave on the power distribution line based on the traveling wave of the current and the traveling wave of the voltage.

[0075] S208, determine the type of directional traveling wave of the main terminal within the monitoring group.

[0076] S210, if the type of directional traveling wave of the main terminal in the monitoring group is reverse traveling wave, determine the type of directional traveling wave of all monitoring terminals in the monitoring group other than the main terminal.

[0077] S212, if the type of directional traveling wave of all monitoring terminals in the monitoring group other than the main terminal is a positive traveling wave, the fault location is determined to be within the monitoring group.

[0078] S214, if the type of directional traveling wave of the main terminal in the monitoring group is a positive traveling wave, it is determined that the fault location is not in the monitoring group.

[0079] The fault location method for distribution lines based on directional traveling waves provided by this invention solves the problem of difficult access to centralized ranging master stations in distribution networks by setting up multiple monitoring terminals on the distribution line and utilizing the traveling waves when a fault occurs in the distribution line. This shortens the fault location time and improves the power supply reliability of the distribution line. Specifically, multiple monitoring terminals can be numbered and grouped to form multiple monitoring groups. Then, the master terminal in each monitoring group is determined according to the terminal number. The master terminal in each monitoring group can then communicate with the monitoring terminals in that group. After determining the fault section of the distribution line based on the type of directional traveling waves of the master terminal and the monitoring terminals in each group, it is not necessary for all monitoring terminals on the distribution line to communicate with the centralized master station. Only the master terminal needs to communicate, reducing the burden on the centralized master station and solving the problem of difficult access to centralized ranging master stations in distribution networks. Meanwhile, since this application can also use the initial traveling wave time information detected by all monitoring terminals in the faulty section to accurately locate the fault location, it can facilitate staff to quickly repair the fault.

[0080] In one embodiment according to this application, such as Figure 3 As shown, a method for fault location in distribution lines based on directional traveling waves is provided. Multiple monitoring terminals are installed on the distribution line. The method for fault location in distribution lines based on directional traveling waves includes:

[0081] S302: Number multiple monitoring terminals and group them to form multiple monitoring groups.

[0082] S304. The main terminal of each monitoring group is determined based on the number of the monitoring terminal within each monitoring group.

[0083] S306, determine the direction of the traveling wave on the power distribution line based on the traveling wave of the current and the traveling wave of the voltage.

[0084] S308, determine the fault section of the power distribution line based on the type of directional traveling wave of the main terminal in each monitoring group and the type of directional traveling wave of all monitoring terminals other than the main terminal in each monitoring group.

[0085] S310, obtain the first moment when the initial wavefront of the traveling wave generated at the fault location arrives at the main terminal, the second moment when the initial wavefront arrives at all monitoring terminals in the monitoring group except the main terminal, the distance from the main terminal to the monitoring terminal, and the propagation speed of the traveling wave.

[0086] S312, based on the first moment, the second moment, the distance from the main terminal to the monitoring terminal, and the propagation speed of the traveling wave, determine the distance from the fault location to the main terminal within the monitoring group.

[0087] The fault location method for distribution lines based on directional traveling waves provided by this invention solves the problem of difficult access to centralized ranging master stations in distribution networks by setting up multiple monitoring terminals on the distribution line and utilizing the traveling waves when a fault occurs in the distribution line. This shortens the fault location time and improves the power supply reliability of the distribution line. Specifically, multiple monitoring terminals can be numbered and grouped to form multiple monitoring groups. Then, the master terminal in each monitoring group is determined according to the terminal number. The master terminal in each monitoring group can then communicate with the monitoring terminals in that group. After determining the fault section of the distribution line based on the type of directional traveling waves of the master terminal and the monitoring terminals in each group, it is not necessary for all monitoring terminals on the distribution line to communicate with the centralized master station. Only the master terminal needs to communicate, reducing the burden on the centralized master station and solving the problem of difficult access to centralized ranging master stations in distribution networks.

[0088] After determining which monitoring group the fault occurred in, the distance from the fault location to the main terminal within that monitoring group can be further determined, facilitating rapid fault repair by staff. Specifically, the process involves first obtaining the first moment when the initial wavefront of the traveling wave generated at the fault location reaches the main terminal within the monitoring group, the second moment when the initial wavefront reaches all monitoring terminals within the group, the distance from the main terminal to each monitoring terminal, and the propagation speed of the traveling wave. Then, based on the first moment, the second moment, the distance from the main terminal to the monitoring terminals, and the propagation speed of the traveling wave, the distance from the fault location to the main terminal within the monitoring group is determined. Since each monitoring group may contain multiple monitoring terminals besides the main terminal, there will be multiple second moments and multiple distances from the main terminal to the monitoring terminals, resulting in multiple final distances. The largest of these multiple distances can then be determined as the distance from the fault location to the main terminal within the monitoring group.

[0089] In one embodiment of this application, a method for fault location of distribution lines based on directional traveling waves is provided, comprising:

[0090] Step 1: Number each monitoring terminal.

[0091] Step 2: Group the numbered terminals according to the network topology, with the terminal with the smallest number in the group being the main terminal.

[0092] Step 3: Construct directional traveling waves based on current traveling waves and voltage traveling waves.

[0093] Step 4: Power system synchronization clock; when the directional traveling wave of the master terminal is a reverse traveling wave, request data from the members in the group, and determine whether the fault is in the group based on the positive or negative directional traveling waves of other members.

[0094] Step 5: When the directional traveling waves of other members are all positive traveling waves, the fault is within the group. Perform distance measurement calculation and upload the largest calculation result to the distribution automation master station.

[0095] The technical solution of this invention realizes a new method for distribution network traveling wave ranging using a local intelligent distributed lightweight master station with directional traveling waves, which solves the problem of difficult access to centralized ranging master stations in distribution networks, shortens fault finding time, and improves the power supply reliability of distribution lines.

[0096] In one embodiment of this application, a method for locating faults in distribution lines based on directional traveling waves is provided. The monitoring terminal is also the master terminal; the monitoring terminals communicate with each other; the terminals perform distance calculations and send the distance results to the distribution automation master station. The method for locating faults in distribution lines based on directional traveling waves includes:

[0097] Step 1: Number the monitoring terminals according to their distribution on the lines. Number them with smaller numbers first, followed by larger numbers. The closer to the power source, the smaller the number; the closer to the load, the larger the number. Number the monitoring terminals on the main lines first, then number the monitoring terminals on the branch lines.

[0098] Step 2: Construct a directional traveling wave based on the voltage traveling wave and the current traveling wave.

[0099] Step 3: Group the monitoring terminals according to the network topology. The monitoring terminal with the lowest number in the same group is the main terminal. Monitoring terminals that have a direct connection to the main terminal are also in this group.

[0100] Step 4: When the fault initial traveling wave detected by the master terminal is a reverse traveling wave, it will request data from other members in the group. If and only if the traveling waves of other members are all positive traveling waves, the master terminal determines that the fault is in the group, performs ranging calculation, and sends the largest result in the ranging results to the distribution automation master station.

[0101] Among them, such as Figure 4 As shown, the principle of the dual-end traveling wave ranging in this application is as follows: Traveling wave ranging devices (monitoring terminals) are installed on both sides M and N of the faulty line. After a fault occurs at point F, the traveling wave front generated at the fault point will propagate to both sides. Figure 4 (The arrows pointing to both sides in the middle F indicate the direction of travel wave propagation). The times when the initial wavefront arrives at the two measuring ends are T1 and T2, respectively. Then, according to the relationship between the line length and the fault distance, the following relationship holds:

[0102] ;

[0103] ;

[0104] in, This represents the distance between M and F. This represents the distance between N and F, v represents the propagation speed of the traveling wave, and L represents the distance between M and N.

[0105] The following example illustrates this. Terminals are deployed at the beginning, middle, and end of the main 10kV line, located at poles #001, #072, and #145 on the main line, respectively. Pole #002 on the main line has a branch. Terminals are deployed at the beginning and end of the branch, located at poles #022 and #041 on the branch.

[0106] Number the terminals. Number the smaller numbers first, then the larger numbers. Terminals closer to the power source (e.g., substation) have smaller numbers, and those closer to the load have larger numbers. Number the terminals on the main lines first, then the terminals on the branch lines. Following this principle, the terminal numbering results are as follows: Figure 5 As shown.

[0107] Directional traveling waves are constructed based on current and voltage traveling waves. After a fault occurs, the initial traveling wave propagates to each terminal. Each terminal records the arrival time of the initial traveling wave and calculates its direction. For trunk lines, a traveling wave from the busbar to the line is defined as a positive traveling wave, and a traveling wave from the line to the busbar is defined as a negative traveling wave. Under these conditions, if the initial voltage traveling wave and the initial current traveling wave have opposite polarities, it is determined to be a negative traveling wave. If the initial current traveling wave and the initial voltage traveling wave have the same polarity, it is a positive traveling wave. For branch lines, a traveling wave from the trunk line to the branch line is defined as a positive traveling wave, and a traveling wave from the branch line to the trunk line is defined as a negative traveling wave. Under these conditions, if the initial voltage traveling wave and the current traveling wave have opposite polarities, it is determined to be a negative traveling wave. If the initial current traveling wave and the initial voltage traveling wave have the same polarity, it is a positive traveling wave.

[0108] Terminals are grouped according to the network topology. ①②④ form one group, ②③ another, and ④⑤ yet another. Terminals within the same group communicate with each other. The terminal with the smallest number in the same group is the master terminal. When the master terminal detects a fault with an initial traveling wave that is negative (reverse traveling wave), it requests data from other members in the group. The master terminal determines that the fault is within the group only if all other members have positive (positive traveling waves), performs ranging calculations, and sends the largest ranging result to the supporting master station.

[0109] The specific explanation is as follows:

[0110] After a fault occurs, the initial traveling wave propagates from the fault point along the line to all locations. The time when the initial traveling wave arrives at terminal i is Ti. Each terminal records the arrival time Ti and the direction of the traveling wave. When the traveling wave is in a positive direction, it is recorded as positive (+). When the traveling wave is in a negative direction, it is recorded as negative (-).

[0111] The following example illustrates the situation where a malfunction occurs:

[0112] 1. The fault point f is located between poles #001 and #002 on the main line.

[0113] like Figure 6 As shown, when the fault is located between poles #001 and #002 on the main line, ① in ①②④ detects a negative traveling wave direction, denoted as T1-, and requests data (traveling wave arrival time and direction) from ②④. The traveling wave directions of ②④ are both positive, denoted as T2+ and T4+, respectively. ① determines that the fault is within the group and performs distance measurement calculation.

[0114] Based on T1, T2, and L12, the distance from the fault point to ① is calculated as follows: .

[0115] Based on T1, T4, and L14, the distance from the fault point to ① is calculated as follows: .

[0116] In theory, It should equal .

[0117] Terminal ① uploads the ranging calculation results to the distribution automation master station (distribution automation master station).

[0118] 2. The fault point f is located between poles #002 and #072 on the main line.

[0119] like Figure 7 As shown, when the fault is located between pole #002 and pole #072 on the main line, the same applies as above: ① Determine that the fault is within the group and perform distance measurement calculation.

[0120] Based on T1, T4, and L14, the distance from the fault point to ① is calculated as the distance from pole #001 to pole #002 on the main line of L14. > Terminal ① uploads the maximum value from the ranging calculation results to the matching autonomous station.

[0121] 3. The fault point f is located before terminal ④ on the branch line.

[0122] like Figure 8 As shown, when the fault is located before terminal ④ on the branch line, ① determines that the fault is within the group and performs distance measurement calculation. Based on T1, T2, and L12, the distance from the fault point to ① is calculated. This is the distance between pole #001 and pole #002 on the main line of L12. < Terminal ① will use the maximum value from the ranging calculation results. Upload to the distribution station.

[0123] 4. Fault point f is located between pole #072 and pole #145 on the main line.

[0124] like Figure 9 As shown, when the fault is located between poles #072 and #145 on the main line, ① in ①②④ detects a negative traveling wave direction and requests data from ②④. Since the traveling wave directions of ②④ are one negative and one positive, ① determines that the fault is not within the group and does not perform distance calculation.

[0125] In step ②③, step ② detects that the traveling wave direction is negative, so step ② requests data from step ③. The traveling wave direction of step ③ is positive, so step ② determines that the fault is within the group and performs distance measurement calculation.

[0126] Based on T2, T3, and L23, the distance from the fault point to ② is calculated as follows: Terminal ② will display the ranging calculation results. Upload to the distribution station.

[0127] 5. The fault point f is located between poles #022 and #041 on the branch line.

[0128] like Figure 10 As shown, when the fault is located between poles #022 and #041 on branch line, ① in ①②④ detects a negative traveling wave direction and requests data from ②④. Since the traveling wave directions of ②④ are one positive and one negative, ① determines that the fault is not within the group and does not perform distance calculation.

[0129] In step ④ of step ⑤, step ④ detects that the traveling wave direction is negative, so step ④ requests data from step ⑤. Since the traveling wave direction of step ⑤ is positive, step ④ determines that the fault is within the group and performs distance measurement calculation.

[0130] Based on T4, T5, and L45, the distance from the fault point to ④ is calculated as follows: Terminal ④ will display the ranging calculation results. Upload to the distribution station.

[0131] 6. For example Figure 11 As shown, when the fault point f is located on an adjacent line, the directional traveling waves detected by terminals ①②③④⑤ are all positive, indicating that the fault is not on this line and no ranging calculation is performed.

[0132] like Figure 12As shown, an embodiment of the second aspect of the present invention provides a distribution line fault location system 1 based on directional traveling waves. Multiple monitoring terminals are installed on the distribution line. The distribution line fault location system 1 based on directional traveling waves includes: a first determining module 10, used to number the multiple monitoring terminals and group them into multiple monitoring groups; a second determining module 11, used to determine the main terminal of each monitoring group based on the number of the monitoring terminals within each monitoring group; a third determining module 12, used to determine the directional traveling wave on the distribution line based on current traveling waves and voltage traveling waves; a first fault determining module 13, used to determine the fault section of the distribution line based on the type of directional traveling wave of the main terminal in each monitoring group and the types of directional traveling waves of all monitoring terminals in each monitoring group other than the main terminal; and a second fault determining module 14, used to determine the fault location based on the initial traveling wave time information detected by all monitoring terminals in the fault section.

[0133] According to the directional traveling wave-based power distribution line fault location system 1 provided by the present invention, multiple monitoring terminals are installed on the power distribution line. The directional traveling wave-based power distribution line fault location system 1 includes a first determining module 10, a second determining module 11, a third determining module 12, a first fault determining module 13, and a second fault determining module 14. The first determining module 10 can number the multiple monitoring terminals and group them to form multiple monitoring groups. The second determining module 11 can determine the main terminal of each monitoring group based on the number of the monitoring terminals within each monitoring group. The third determining module 12 can determine the directional traveling wave on the power distribution line based on the current traveling wave and the voltage traveling wave. The first fault determining module 13 can determine the fault section of the power distribution line based on the type of directional traveling wave of the main terminal in each monitoring group and the types of directional traveling waves of all monitoring terminals in each monitoring group other than the main terminal. The second fault determining module 14 can determine the fault location based on the initial traveling wave time information detected by all monitoring terminals in the fault section. The fault location system 1 for power distribution lines based on directional traveling waves provided by the present invention can determine the specific location of the fault by setting up multiple monitoring terminals on the power distribution line and using the traveling waves when the power distribution line fault occurs and the initial traveling wave time information of the multiple monitoring terminals, thereby shortening the fault search time and improving the power supply reliability of the power distribution line.

[0134] like Figure 13 As shown, an embodiment of the third aspect of the present invention provides a power distribution line fault location device 2 based on directional traveling wave, comprising: a memory 22 and a processor 24, wherein the memory 22 stores a program or instructions, and when the program or instructions are executed by the processor 24, the steps of the power distribution line fault location method based on directional traveling wave as described in any embodiment of the first aspect are implemented.

[0135] The distribution line fault location device 2 based on directional traveling wave provided by the present invention includes a memory 22 and a processor 24. The memory 22 stores programs or instructions. When the programs or instructions are executed by the processor 24, they implement the steps of the distribution line fault location method based on directional traveling wave as described in any embodiment of the first aspect. Since this distribution line fault location device 2 based on directional traveling wave can implement the steps of the distribution line fault location method based on directional traveling wave as described in any embodiment of the first aspect, the distribution line fault location device 2 based on directional traveling wave provided by the present invention also possesses all the beneficial effects of the distribution line fault location method based on directional traveling wave as described in any embodiment of the first aspect, which will not be elaborated further here.

[0136] An embodiment of the fourth aspect of the present invention provides a storage medium having a program or instructions stored thereon, which, when executed, implement the steps of the distribution line fault location method based on directional traveling wave as described in any embodiment of the first aspect.

[0137] According to the storage medium provided by the present invention, a program or instructions are stored thereon, which, when executed, implement the steps of the distribution line fault location method based on directional traveling wave as described in any embodiment of the first aspect. Since this storage medium is capable of implementing the steps of the distribution line fault location method based on directional traveling wave as described in any embodiment of the first aspect, the storage medium provided by the present invention also possesses all the beneficial effects of the distribution line fault location method based on directional traveling wave as described in any embodiment of the first aspect, which will not be elaborated further here.

[0138] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0139] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0140] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0141] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for fault location in power distribution lines based on directional traveling waves, characterized in that, Multiple monitoring terminals are installed on the power distribution line, and the power distribution line fault location method based on directional traveling waves includes: The monitoring terminals are numbered and grouped to form multiple monitoring groups; The main terminal of each monitoring group is determined according to the number of the monitoring terminal within each monitoring group; The directional traveling wave on the power distribution line is determined based on the current traveling wave and the voltage traveling wave; The fault section of the power distribution line is determined based on the type of directional traveling wave of the main terminal in each monitoring group and the type of directional traveling wave of all monitoring terminals in each monitoring group other than the main terminal. The fault location is determined based on the initial traveling wave time information detected by all monitoring terminals in the fault section; The step of determining the fault location based on the initial traveling wave time information detected by all monitoring terminals in the fault section includes: The moment when the initial wavefront of the traveling wave generated at the fault location arrives at the main terminal is recorded as the first moment; The time when the initial wavefront reaches all monitoring terminals in the monitoring group except for the main terminal is recorded as the second time. Obtain the distance from the main terminal to the monitoring terminal, and the propagation speed of the traveling wave; The distance from the fault location to the main terminal within the monitoring group is determined based on the first time point, the second time point, the distance from the main terminal to the monitoring terminal, and the propagation speed of the traveling wave. When the traveling wave detected by the main terminal is a reverse traveling wave, it requests data from the monitoring terminals in the monitoring group. If and only if the traveling waves of the other monitoring terminals in the monitoring group are all positive traveling waves, the main terminal determines that the fault is within the group, performs distance calculation, and sends the maximum result of the distance calculation to the distribution automation master station. The maximum distance among the multiple distances is determined as the distance from the fault location to the main terminal in the monitoring group.

2. The method for fault location of distribution lines based on directional traveling waves according to claim 1, characterized in that, The step of determining the fault section of the power distribution line based on the type of directional traveling wave of the main terminal in each monitoring group and the types of directional traveling waves of all monitoring terminals in each monitoring group other than the main terminal includes: Determine the type of directional traveling wave of the main terminal within the monitoring group; If the type of the directional traveling wave of the main terminal in the monitoring group is a reverse traveling wave, the location of the fault is determined to be within the monitoring group based on the directional traveling waves of all monitoring terminals in the monitoring group other than the main terminal. If the type of the directional traveling wave of the main terminal within the monitoring group is a positive traveling wave, then the fault location is determined to be outside the monitoring group.

3. The method for fault location of distribution lines based on directional traveling waves according to claim 2, characterized in that, When the type of the directional traveling wave of the main terminal within the monitoring group is a reverse traveling wave, the step of determining whether the fault location is within the monitoring group based on the directional traveling waves of all monitoring terminals other than the main terminal within the monitoring group includes: Determine the type of directional traveling wave for all monitoring terminals in the monitoring group, excluding the main terminal; If the type of the directional traveling wave of all monitoring terminals in the monitoring group other than the main terminal is a positive traveling wave, then the fault location is determined to be within the monitoring group.

4. The method for fault location of distribution lines based on directional traveling waves according to claim 1, characterized in that, The step of numbering the multiple monitoring terminals includes: Determine the main line and branch lines of the power distribution line; The monitoring terminals are numbered based on the main line and the branch lines.

5. The method for fault location of distribution lines based on directional traveling waves according to claim 1, characterized in that, The step of numbering the multiple monitoring terminals includes: Determine the distances from the multiple monitoring terminals to the power supply or load end; The monitoring terminals are numbered according to their distance from the power source or the load. The number of the monitoring terminal closer to the power source is less than the number of the monitoring terminal farther from the power source, and the number of the monitoring terminal closer to the load is greater than the number of the monitoring terminal farther from the load.

6. The method for fault location of distribution lines based on directional traveling waves according to claim 1, characterized in that, The step of determining the master terminal of each monitoring group based on the number of the monitoring terminal within each monitoring group includes: Obtain the numbers of all monitoring terminals within each monitoring group; Identify the monitoring terminal with the smallest number within each monitoring group; The monitoring terminal with the smallest number is identified as the master terminal.

7. The method for fault location of distribution lines based on directional traveling waves according to claim 1, characterized in that, The step of grouping the multiple monitoring terminals to form multiple monitoring groups includes: Obtain the network topology of the power distribution line; The monitoring terminals are grouped according to the network topology to form multiple monitoring groups.

8. A power distribution line fault location system based on directional traveling waves, characterized in that, Multiple monitoring terminals are installed on the power distribution line, and the power distribution line fault location system based on directional traveling waves includes: The first determining module is used to number the multiple monitoring terminals and group the multiple monitoring terminals to form multiple monitoring groups; The second determining module is used to determine the main terminal of each monitoring group based on the number of the monitoring terminal in each monitoring group; The third determining module is used to determine the direction of the traveling wave on the power distribution line based on the current traveling wave and the voltage traveling wave; The first fault determination module is used to determine the fault section of the power distribution line based on the type of directional traveling wave of the main terminal in each monitoring group and the type of directional traveling wave of all monitoring terminals in each monitoring group other than the main terminal. The second fault determination module is used to determine the fault location based on the initial traveling wave time information detected by all the monitoring terminals in the fault section; The step of determining the fault location based on the initial traveling wave time information detected by all monitoring terminals in the fault section includes: The moment when the initial wavefront of the traveling wave generated at the fault location arrives at the main terminal is recorded as the first moment; The time when the initial wavefront reaches all monitoring terminals in the monitoring group except for the main terminal is recorded as the second time. Obtain the distance from the main terminal to the monitoring terminal, and the propagation speed of the traveling wave; The distance from the fault location to the main terminal within the monitoring group is determined based on the first time point, the second time point, the distance from the main terminal to the monitoring terminal, and the propagation speed of the traveling wave. When the traveling wave detected by the main terminal is a reverse traveling wave, it requests data from the monitoring terminals in the monitoring group. If and only if the traveling waves of the other monitoring terminals in the monitoring group are all positive traveling waves, the main terminal determines that the fault is within the group, performs distance calculation, and sends the maximum result of the distance calculation to the distribution automation master station. The maximum distance among the multiple distances is determined as the distance from the fault location to the main terminal in the monitoring group.

9. A fault location device for power distribution lines based on directional traveling waves, characterized in that, include: A memory and a processor, wherein the memory stores a program or instructions, which, when executed by the processor, implement the steps of the distribution line fault location method based on directional traveling waves as described in any one of claims 1 to 7.

10. A storage medium, characterized in that, It stores a program or instructions, which, when executed, implement the steps of the distribution line fault location method based on directional traveling waves as described in any one of claims 1 to 7.

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