Method, device, equipment and medium for locating traveling wave faults in hybrid lines of distribution network

Abstract

The present invention discloses a method, device, equipment and medium for locating a traveling wave fault in a hybrid line of a distribution network, which is used to solve the technical problem that the prior art cannot accurately locate the traveling wave fault in the hybrid line of the distribution network. The present invention includes: decomposing a preset distribution network line into a plurality of T-type lines, each T-type line having three branch sections; the preset distribution network line is a multi-branch aerial line-cable hybrid distribution network line; determining the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line; when the fault branch section has multiple nodes, calculating the traveling wave time parameter of each node between the fault branch sections, and determining the fault section according to the traveling wave time parameter; obtaining the wave velocity of the fault traveling wave in the fault section, and the time difference between the fault traveling wave reaching the two ends of the fault section, and locating the fault position point on the fault section according to the wave velocity and the time difference.

Description

Technical Field

[0001] The present invention relates to the technical field of fault location, and in particular to a method, device, equipment and medium for locating traveling wave faults in a hybrid line of a distribution network. Background Art

[0002] The structure of 10-60kV medium voltage distribution network is complex, mostly in the form of tree-like branches. At present, the urban distribution network is not only intricately branched, but also in order to save the line corridor in the core area of ​​the city, the use of cables in the core area has become the main choice. Therefore, the power grid often has distribution lines composed of multiple sections of overhead lines and cables. Due to the insulating medium of the cable itself, the speed of the traveling wave in the cable is relatively low, generally 1 / 2 or 2 / 3 of the speed of the traveling wave of the overhead line. Therefore, for the overhead-cable hybrid line, there is a problem of different traveling wave speeds in each section of the line, so that the traveling wave ranging cannot directly use the traditional single-end and double-end traveling wave ranging methods, but needs to be processed in sections according to the parameters of the hybrid line. The tree-like branch structure of the distribution network is also prone to bring multiple positioning results to the traveling wave positioning. Summary of the invention

[0003] The present invention provides a method, device, equipment and medium for locating a traveling wave fault in a hybrid line of a distribution network, which are used to solve the technical problem that the prior art cannot accurately locate a traveling wave fault in a hybrid line of a distribution network.

[0004] The present invention provides a method for locating a traveling wave fault in a hybrid line of a distribution network, comprising:

[0005] Decomposing the preset distribution network line into a plurality of T-shaped lines, each T-shaped line having three branch sections; the preset distribution network line is a multi-branch aerial line-cable hybrid distribution network line;

[0006] Determine the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line;

[0007] When the fault branch segment has multiple nodes, calculating the travel wave time parameter of each node between the fault branch segments, and determining the fault segment according to the travel wave time parameter;

[0008] The wave velocity of the fault traveling wave in the fault section and the time difference between the fault traveling wave and the two ends of the fault section are obtained, and the fault position point is located on the fault section according to the wave velocity and the time difference.

[0009] Optionally, the step of determining the fault branch segment according to the propagation time of the fault traveling wave reaching the end of each branch segment of each T-type line includes:

[0010] Obtain the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line;

[0011] Calculate the first propagation time length of the fault traveling wave between the ends of any two branch segments of each T-type line according to the propagation time;

[0012] Obtaining a second propagation time length of a preset traveling wave between ends of any two branch segments of each T-type line;

[0013] Determine a T-type line corresponding to a second propagation time length equal to the first propagation time length as a faulty T-type line;

[0014] The faulty branch section is determined according to the propagation time of the faulty traveling wave reaching the end of each branch section of the faulty T-type line.

[0015] Optionally, when the fault branch segment has multiple nodes, the step of calculating a traveling wave time parameter of each node between the fault branch segments, and determining the fault segment according to the traveling wave time parameter comprises:

[0016] When the fault branch segment has multiple nodes, calculating the first traveling wave propagation time difference between each node and two ends of the fault branch segment;

[0017] Obtaining a propagation time difference between the fault traveling wave and a second traveling wave between two ends of the fault branch segment;

[0018] A fault section is determined according to the first traveling wave propagation time difference and the second traveling wave propagation time difference.

[0019] Optionally, the step of obtaining the wave velocity of the fault traveling wave in the fault section, and the time difference between the fault traveling wave and the two ends of the fault section, and locating the fault position point on the fault section according to the wave velocity and the time difference comprises:

[0020] Obtaining the wave velocity of the fault traveling wave in the fault section and the time difference between the fault traveling wave and the two ends of the fault section;

[0021] Obtaining the length of the fault section;

[0022] Calculate the fault distance according to the wave speed, the time difference and the length;

[0023] The fault location point is located on the fault section according to the fault distance.

[0024] The present invention also provides a distribution network hybrid line traveling wave fault location device, which is characterized by comprising:

[0025] A decomposition module is used to decompose a preset distribution network line into a plurality of T-type lines, each T-type line having three branch sections; the preset distribution network line is a multi-branch aerial line-cable hybrid distribution network line;

[0026] A fault branch section determination module is used to determine the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line;

[0027] A fault section determination module, used for calculating a travel wave time parameter of each node between the fault branch sections when the fault branch section has multiple nodes, and determining the fault section according to the travel wave time parameter;

[0028] The fault location point positioning module is used to obtain the wave velocity of the fault traveling wave in the fault section and the time difference between the fault traveling wave and the two ends of the fault section, and locate the fault location point on the fault section according to the wave velocity and the time difference.

[0029] Optionally, the fault branch segment determination module includes:

[0030] The propagation time acquisition submodule is used to obtain the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line;

[0031] A first propagation time calculation submodule, used for calculating a first propagation time of the fault traveling wave between the ends of any two branch segments of each T-type line according to the propagation time;

[0032] A second propagation time acquisition submodule is used to acquire a second propagation time of a preset traveling wave between the ends of any two branch segments of each T-type line;

[0033] a faulty T-type line determination submodule, configured to determine a T-type line corresponding to a second propagation time length equal to the first propagation time length as a faulty T-type line;

[0034] The fault branch section determination submodule is used to determine the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of the fault T-type line.

[0035] Optionally, the fault section determination module includes:

[0036] A first traveling wave propagation time difference calculation submodule, used for calculating a first traveling wave propagation time difference between each node and two ends of the fault branch segment when the fault branch segment has multiple nodes;

[0037] A second traveling wave propagation time difference acquisition submodule, used for acquiring a second traveling wave propagation time difference between the fault traveling wave and two ends of the fault branch segment;

[0038] The fault section determination submodule is used to determine the fault section according to the first traveling wave propagation time difference and the second traveling wave propagation time difference.

[0039] Optionally, the fault location point positioning module includes:

[0040] The wave speed and time difference acquisition submodule is used to acquire the wave speed of the fault traveling wave in the fault section and the time difference of the fault traveling wave reaching the two ends of the fault section;

[0041] A length acquisition submodule, used to acquire the length of the fault section;

[0042] A fault distance calculation submodule, used to calculate the fault distance according to the wave speed, the time difference and the length;

[0043] The fault location point positioning submodule is used to locate the fault location point on the fault section according to the fault distance.

[0044] The present invention also provides an electronic device, the device comprising a processor and a memory:

[0045] The memory is used to store program code and transmit the program code to the processor;

[0046] The processor is used to execute the distribution network hybrid line traveling wave fault location method as described in any one of the above items according to the instructions in the program code.

[0047] The present invention also provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the method for locating traveling wave faults in hybrid lines of a distribution network as described in any one of the above items.

[0048] It can be seen from the above technical scheme that the present invention has the following advantages: the present invention discloses a method for locating traveling wave faults in a hybrid line of a distribution network, specifically comprising: decomposing a preset distribution network line into a plurality of T-type lines, each T-type line having three branch sections; the preset distribution network line is a multi-branch aerial line-cable hybrid distribution network line; determining the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line; when the fault branch section has multiple nodes, calculating the traveling wave time parameter of each node between the fault branch sections, and determining the fault section according to the traveling wave time parameter; obtaining the wave velocity of the fault traveling wave in the fault section, and the time difference between the fault traveling wave reaching the two ends of the fault section, and locating the fault position point on the fault section according to the wave velocity and the time difference. Accurate positioning of traveling wave faults in hybrid lines of distribution networks is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 A flow chart of the steps of a method for locating a traveling wave fault in a hybrid line of a distribution network provided by an embodiment of the present invention;

[0051] Figure 2 A schematic diagram of a multi-branch air line-cable hybrid line structure provided by an embodiment of the present invention;

[0052] Figure 3 A schematic diagram of a T-type circuit structure provided by an embodiment of the present invention;

[0053] Figure 4 A schematic diagram of a fault branch segment structure provided by an embodiment of the present invention;

[0054] Figure 5 A structural block diagram of a distribution network hybrid line traveling wave fault locating device provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0055] The multi-branch overhead line-cable hybrid distribution network line involves two types of lines, overhead lines and cables, and there is a problem of different traveling wave velocities in each section of the line, so that the traditional single-end and double-end traveling wave ranging methods cannot be directly used for traveling wave ranging. In view of this, the embodiment of the present invention provides a method, device, equipment and medium for locating traveling wave faults in a hybrid distribution network line, which is used to solve the technical problem that the prior art cannot accurately locate traveling wave faults in a hybrid distribution network line.

[0056] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] See also Figure 1 , Figure 1 A flow chart of the steps of a method for locating traveling wave faults in a hybrid line of a distribution network provided by an embodiment of the present invention.

[0058] The present invention provides a method for locating a traveling wave fault in a hybrid line of a distribution network, which may specifically include the following steps:

[0059] Step 101, decomposing a preset distribution network line into a plurality of T-shaped lines, each T-shaped line having three branch sections; the preset distribution network line is a multi-branch aerial line-cable hybrid distribution network line;

[0060] The embodiment of the present invention first decomposes the multi-branch distribution network line into several T-type lines, and decomposes the fault location for the multi-branch distribution network line into the fault location for each T-type line, thereby narrowing the range of locating the fault point. Each T-type line has three branch sections.

[0061] In one example, the decomposition of the distribution network line can be achieved through the following process: first, the nodes of each section of the multi-branch hybrid distribution line are marked with letters, where the line contains m branch nodes, which can be represented by Indicated; the line also contains n terminals, respectively If it is expressed, then we can get Figure 2 The multi-branch air line-cable hybrid line structure shown in the figure. Then take any two ends, such as e1 and e n As the fixed nodes of the T-type line, select n Either end of e b If a T-type circuit is formed, it can be decomposed into (n-2) T-type circuits. Figure 3 A schematic diagram of a T-type circuit structure provided in an embodiment of the present invention.

[0062] It should be noted that the above is only an example of disassembling the distribution network line into T-type lines. Those skilled in the art can decompose it according to actual needs, and this application does not make any specific limitation.

[0063] Step 102, determining the faulty branch segment according to the propagation time of the fault traveling wave reaching the end of each branch segment of each T-type line;

[0064] In the embodiment of the present invention, after the decomposition of the distribution network line is completed, the fault branch section can be determined according to the propagation time of the fault traveling wave starting from the fault location point to the end of each branch section of each T-type line.

[0065] In one example, step 102 may include the following sub-steps:

[0066] S21, obtaining the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line;

[0067] S22, calculating the first propagation time length of the fault traveling wave between the ends of any two branch segments of each T-type line according to the propagation time;

[0068] S23, obtaining a second propagation time length of a preset traveling wave between ends of any two branch segments of each T-shaped line;

[0069] S24, determining a T-type line corresponding to a second propagation time length equal to the first propagation time length as a faulty T-type line;

[0070] S25, determining the faulty branch section according to the propagation time of the faulty traveling wave reaching the end of each branch section of the faulty T-type line.

[0071] In practical applications, each T-type line is analyzed and the fixed ends e1 and e n In the case of T-type line, let the branch node be O, the distance between the fault location and O be x, and assume that the fault occurs in the branch segment Oe b The fault wave propagates to point f. n The distance is longer than line e1Oe n The length of the fault wave is 2x longer. The fault wave propagates to nodes e1 and e b and e b 、e n The distance is e1Oe b and e b Oe n Length.

[0072] Therefore, when a ground fault occurs, the terminals e1 and e2 can be connected one by one. j (j=3, 4, ..., n) to establish a T-type line. Since the speed of the traveling wave is basically constant for a certain line, the above process can be converted into a judgment of time. In a specific implementation, when the first propagation time of the fault traveling wave between the ends of any two branch segments of each T-type line is the same as the second propagation time of the traveling wave between the two branch segments, it can be determined that the T-type line where the two branch segments are located has a fault. That is, when it is detected that there is a fault that satisfies In any of the three cases, it can be determined that it is a T-type line e1e b e j A malfunction has occurred.

[0073] Furthermore, if the fault occurs at point f, the following relationship holds:

[0074]

[0075] in, The traveling waves pass through the lines e1Oe j 、e1Oe b 、e b Oe j Time required, are the initial fault wave propagating to the ends e1 and e2 respectively. j , e1 and e b 、e b and e j The sum of the time taken for the traveling wave detection device to detect the fault can be obtained by collecting the time when the first traveling wave detected by the traveling wave detection device at the terminal node of the distribution network reaches the traveling wave detection device after the fault occurs.

[0076] That is, the total time of the traveling wave from the fault to the ends of the two non-fault branches is greater than the time of the traveling wave passing through the line determined by the ends of the two non-fault branches. Thus, the fault branch section on the faulty T-type line can be determined.

[0077] Step 103, when the fault branch segment has multiple nodes, calculate the travel wave time parameter of each node between the fault branch segments, and determine the fault segment according to the travel wave time parameter;

[0078] In the embodiment of the present invention, when the fault branch segment has multiple nodes, the traveling wave time parameter of each node between the fault branch segments can be calculated, and the fault segment can be determined according to the traveling wave time parameter.

[0079] In one example, step 103 may include the following sub-steps:

[0080] S31, when the fault branch segment has multiple nodes, calculating the first traveling wave propagation time difference between each node and two ends of the fault branch segment;

[0081] S32, obtaining a propagation time difference between the fault traveling wave and a second traveling wave between two ends of the fault branch segment;

[0082] S33, determining the fault section according to the first traveling wave propagation time difference and the second traveling wave propagation time difference.

[0083] In a specific implementation, the first traveling wave propagation time difference between each node and both ends of the fault branch segment can be calculated, and the second traveling wave propagation time difference between the fault traveling wave and both ends of the fault branch segment can be obtained. The fault section can be determined by comparing the first traveling wave propagation time difference with the second traveling wave propagation time difference.

[0084] In one example, if Figure 4 As shown in the figure, if the fault branch section is a mixed line consisting of k sections of overhead lines and cables, each node is recorded as The beginning and the end of the fault branch segment are taken as the detection ends, denoted as A0 and A1 respectively. k The length and wave speed L of each section of the line can be known from the specific parameters of each section of the line. i 、v i The time required for the traveling wave to pass through each line segment can be calculated: T i =Li / v i Then we can get the traveling wave from each node The propagation time difference of the first wave reaching the beginning and end of the fault branch segment

[0085] If a fault occurs, record the absolute time when the fault wave reaches the beginning and end of the fault branch segment respectively. and Then the second propagation time difference can be calculated and with Compare them one by one until the following relationship is established:

[0086]

[0087] This indicates that the fault point is at node A. j-1 It is far from the beginning of the faulty branch segment, close to the end of the faulty branch segment, and at node A j The position closer to the beginning of the fault branch section and farther from the end of the fault branch section, that is, on the j-th line section, the j-end line section is the fault section.

[0088] Step 104 , obtaining the wave velocity of the fault traveling wave in the fault section and the time difference between the fault traveling wave and the two ends of the fault section, and locating the fault position point on the fault section according to the wave velocity and the time difference.

[0089] In this embodiment of the present invention, step 104 may include the following sub-steps:

[0090] S41, obtaining the wave velocity of the fault traveling wave in the fault section and the time difference between the fault traveling wave and the two ends of the fault section;

[0091] S42, obtaining the length of the fault section;

[0092] S43, calculating the fault distance according to the wave speed, time difference and length;

[0093] S44, locating the fault location point on the fault section according to the fault distance.

[0094] In the specific implementation, after determining that the fault branch section is the jth line section, the fault distance between the fault point position and the head end of the fault branch section can be calculated according to the double-end traveling wave positioning formula. The specific formula is as follows:

[0095]

[0096] in, From the fault location point to the beginning of the fault section A j-1 distance, v is the speed of the traveling wave, It is the time difference between the fault traveling wave and the two ends of the fault section.

[0097]

[0098] is the length of the jth line segment.

[0099] After calculating the fault distance, the fault location can be located based on the fault distance, taking the head end of the fault section as the starting point.

[0100] The present invention discloses a method for locating a traveling wave fault in a hybrid line of a distribution network, which specifically includes: decomposing a preset distribution network line into a plurality of T-type lines, each T-type line having three branch sections; the preset distribution network line is a multi-branch aerial line-cable hybrid distribution network line; determining the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line; when the fault branch section has multiple nodes, calculating the traveling wave time parameter of each node between the fault branch sections, and determining the fault section according to the traveling wave time parameter; obtaining the wave velocity of the fault traveling wave in the fault section, and the time difference between the fault traveling wave reaching the two ends of the fault section, and locating the fault position point on the fault section according to the wave velocity and the time difference. Accurate locating of the traveling wave fault of the hybrid line of the distribution network is achieved.

[0101] See also Figure 5 , Figure 5 A structural block diagram of a distribution network hybrid line traveling wave fault locating device provided by an embodiment of the present invention.

[0102] The embodiment of the present invention provides a distribution network hybrid line traveling wave fault location device, comprising:

[0103] The decomposition module 501 is used to decompose the preset distribution network line into a plurality of T-shaped lines, each T-shaped line having three branch sections; the preset distribution network line is a multi-branch aerial line-cable hybrid distribution network line;

[0104] A fault branch section determination module 502 is used to determine the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line;

[0105] A fault section determination module 503 is used to calculate the travel wave time parameter of each node between the fault branch sections when the fault branch section has multiple nodes, and determine the fault section according to the travel wave time parameter;

[0106] The fault location point positioning module 504 is used to obtain the wave velocity of the fault traveling wave in the fault section and the time difference between the fault traveling wave and the two ends of the fault section, and locate the fault point on the fault section according to the wave velocity and the time difference.

[0107] In the embodiment of the present invention, the fault branch segment determining module 502 includes:

[0108] The propagation time acquisition submodule is used to obtain the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line;

[0109] A first propagation time calculation submodule is used to calculate the first propagation time of the fault traveling wave between the ends of any two branch segments of each T-type line according to the propagation time;

[0110] A second propagation time acquisition submodule is used to acquire a second propagation time of a preset traveling wave between the ends of any two branch segments of each T-type line;

[0111] A faulty T-type line determination submodule, configured to determine a T-type line corresponding to a second propagation time length equal to the first propagation time length as a faulty T-type line;

[0112] The fault branch section determination submodule is used to determine the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of the faulty T-type line.

[0113] In the embodiment of the present invention, the fault section determination module 503 includes:

[0114] A first traveling wave propagation time difference calculation submodule, used for calculating the first traveling wave propagation time difference between each node and both ends of the fault branch segment when the fault branch segment has multiple nodes;

[0115] A second traveling wave propagation time difference acquisition submodule, used to acquire the second traveling wave propagation time difference between the fault traveling wave and both ends of the fault branch segment;

[0116] The fault section determination submodule is used to determine the fault section according to the first traveling wave propagation time difference and the second traveling wave propagation time difference.

[0117] In the embodiment of the present invention, the fault location point locating module 504 includes:

[0118] The wave speed and time difference acquisition submodule is used to obtain the wave speed of the fault traveling wave in the fault section and the time difference between the fault traveling wave and the two ends of the fault section;

[0119] The length acquisition submodule is used to obtain the length of the fault section;

[0120] A fault distance calculation submodule is used to calculate the fault distance based on wave speed, time difference and length;

[0121] The fault location point locating submodule is used to locate the fault location point on the fault section according to the fault distance.

[0122] An embodiment of the present invention further provides an electronic device, the device comprising a processor and a memory:

[0123] The memory is used to store the program code and transmit the program code to the processor;

[0124] The processor is used to execute the distribution network hybrid line traveling wave fault location method according to the instructions in the program code.

[0125] An embodiment of the present invention further provides a computer-readable storage medium, which is used to store program codes, and the program codes are used to execute the method for locating traveling wave faults in hybrid lines of a distribution network according to an embodiment of the present invention.

[0126] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0127] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0128] It will be appreciated by those skilled in the art that the embodiments of the present invention may be provided as methods, devices, or computer program products. Therefore, the embodiments of the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the embodiments of the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0129] The embodiments of the present invention are described with reference to the flowcharts and / or block diagrams of the methods, terminal devices (systems), and computer program products according to the embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0130] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0131] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1 A process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0132] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present invention.

[0133] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0134] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for locating traveling wave faults in hybrid lines of a distribution network, characterized in that: include: Decomposing the preset power distribution network line into a plurality of T-type lines, each T-type line having three branch sections; The preset distribution network line is a multi-branch aerial line-cable hybrid distribution network line; Determine the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line; When the fault branch segment has multiple nodes, calculating the travel wave time parameter of each node between the fault branch segments, and determining the fault segment according to the travel wave time parameter; Acquire the wave velocity of the fault traveling wave in the fault section, and the time difference between the fault traveling wave and the two ends of the fault section, and locate the fault position point on the fault section according to the wave velocity and the time difference; The step of determining the fault branch segment according to the propagation time of the fault traveling wave reaching the end of each branch segment of each T-type line includes: Obtain the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line; Calculate the first propagation time length of the fault traveling wave between the ends of any two branch segments of each T-type line according to the propagation time; Obtaining a second propagation time length of a preset traveling wave between ends of any two branch segments of each T-type line; Determine a T-type line corresponding to a second propagation time length equal to the first propagation time length as a faulty T-type line; The faulty branch section is determined according to the propagation time of the faulty traveling wave reaching the end of each branch section of the faulty T-type line.

2. The method according to claim 1, characterized in that When the fault branch segment has multiple nodes, the step of calculating the travel wave time parameter of each node between the fault branch segments and determining the fault segment according to the travel wave time parameter comprises: When the fault branch segment has multiple nodes, calculating the first traveling wave propagation time difference between each node and two ends of the fault branch segment; Obtaining a propagation time difference between the fault traveling wave and a second traveling wave between two ends of the fault branch segment; A fault section is determined according to the first traveling wave propagation time difference and the second traveling wave propagation time difference.

3. The method according to claim 1, characterized in that The step of obtaining the wave velocity of the fault traveling wave in the fault section, and the time difference of the fault traveling wave reaching both ends of the fault section, and locating the fault position point on the fault section according to the wave velocity and the time difference comprises: Obtaining the wave velocity of the fault traveling wave in the fault section and the time difference between the fault traveling wave and the two ends of the fault section; Obtaining the length of the fault section; Calculate the fault distance according to the wave speed, the time difference and the length; The fault location point is located on the fault section according to the fault distance.

4. A traveling wave fault location device for a hybrid line of a distribution network, characterized in that: include: A decomposition module, used for decomposing a preset distribution network line into a plurality of T-type lines, each T-type line having three branch sections; The preset distribution network line is a multi-branch aerial line-cable hybrid distribution network line; A fault branch section determination module is used to determine the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line; A fault section determination module, used for calculating a travel wave time parameter of each node between the fault branch sections when the fault branch section has multiple nodes, and determining the fault section according to the travel wave time parameter; A fault location point positioning module is used to obtain the wave velocity of the fault traveling wave in the fault section and the time difference between the fault traveling wave and the two ends of the fault section, and locate the fault location point on the fault section according to the wave velocity and the time difference; Wherein, the fault branch segment determination module includes: The propagation time acquisition submodule is used to obtain the propagation time of the fault traveling wave reaching the end of each branch section of each T-type line; A first propagation time calculation submodule, used for calculating a first propagation time of the fault traveling wave between the ends of any two branch segments of each T-type line according to the propagation time; A second propagation time acquisition submodule is used to acquire a second propagation time of a preset traveling wave between the ends of any two branch segments of each T-type line; a faulty T-type line determination submodule, configured to determine a T-type line corresponding to a second propagation time length equal to the first propagation time length as a faulty T-type line; The fault branch section determination submodule is used to determine the fault branch section according to the propagation time of the fault traveling wave reaching the end of each branch section of the fault T-type line.

5. The device according to claim 4, characterized in that The fault section determination module comprises: A first traveling wave propagation time difference calculation submodule, used for calculating a first traveling wave propagation time difference between each node and two ends of the fault branch segment when the fault branch segment has multiple nodes; A second traveling wave propagation time difference acquisition submodule, used for acquiring a second traveling wave propagation time difference between the fault traveling wave and two ends of the fault branch segment; The fault section determination submodule is used to determine the fault section according to the first traveling wave propagation time difference and the second traveling wave propagation time difference.

6. The device according to claim 4, characterized in that The fault location point positioning module includes: The wave speed and time difference acquisition submodule is used to acquire the wave speed of the fault traveling wave in the fault section and the time difference of the fault traveling wave reaching the two ends of the fault section; A length acquisition submodule, used to acquire the length of the fault section; A fault distance calculation submodule, used to calculate the fault distance according to the wave speed, the time difference and the length; The fault location point positioning submodule is used to locate the fault location point on the fault section according to the fault distance.

7. An electronic device, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the distribution network hybrid line traveling wave fault location method described in any one of claims 1-3 according to the instructions in the program code.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store program code, and the program code is used to execute the distribution network hybrid line traveling wave fault location method according to any one of claims 1-3.

Images