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CN-122017466-A - Low-voltage leakage fault positioning method, system, medium and product

CN122017466ACN 122017466 ACN122017466 ACN 122017466ACN-122017466-A

Abstract

A low-voltage leakage fault positioning method, a system, a medium and a product relate to the field of electric power detection. The method comprises the steps of obtaining zero sequence current signals at a neutral line grounding down-lead of a low-voltage side of a distribution transformer of a target power distribution network through a flexible zero sequence current detection unit, analyzing the zero sequence current signals through an analysis control module to obtain signal analysis results, generating leakage pre-judging information when the signal analysis results represent potential leakage areas, controlling a signal injection module to inject characteristic detection signals into the target power distribution network, controlling an overhead signal induction unit and an auxiliary environment induction unit to cooperatively detect signals in the potential leakage areas to obtain leakage detection data, and analyzing the leakage detection data through the analysis control module to determine the position of a leakage fault point of the target power distribution network. The application can improve the efficiency and reliability of low-voltage electric leakage positioning.

Inventors

  • DONG CHENGZHE
  • WANG LIZONG

Assignees

  • 北京新源绿网节能科技有限公司

Dates

Publication Date
20260512
Application Date
20260327

Claims (10)

  1. 1. The utility model provides a low pressure electric leakage fault location method which characterized in that is applied to low pressure electric leakage locator, low pressure electric leakage locator includes host computer (10), flexible zero sequence current detection unit (20), high altitude signal induction unit (30) and auxiliary environment induction unit (40), host computer (10) contain signal injection module and analysis control module, flexible zero sequence current detection unit (20) signal output part (21) can dismantle the electricity through the adaptation cable with signal input part (11) of host computer (10) and be connected, high altitude signal induction unit (30) with auxiliary environment induction unit (40) respectively with host computer (10) wireless communication connection, the method includes: Acquiring a zero sequence current signal at a neutral line grounding downlead of a low-voltage side of a distribution transformer of a target power distribution network through the flexible zero sequence current detection unit (20); analyzing the zero sequence current signal through the analysis control module to obtain a signal analysis result; Generating leakage pre-judging information when the signal analysis result represents that a potential leakage area exists; The analysis control module controls the signal injection module to inject a characteristic detection signal into the target power distribution network based on the electric leakage pre-judging information, and controls the high-altitude signal induction unit (30) and the auxiliary environment induction unit (40) to cooperatively detect signals in the potential electric leakage area to obtain electric leakage detection data; And analyzing the electric leakage detection data through the analysis control module, and determining the position of the electric leakage fault point of the target power distribution network.
  2. 2. The method according to claim 1, wherein the analyzing, by the analysis control module, the zero sequence current signal to obtain a signal analysis result includes: Filtering and extracting characteristic parameters of the zero sequence current signal through the analysis control module to obtain a group of characteristic parameters representing signal characteristics; Acquiring network topology data of the target power distribution network, wherein the network topology data comprises electrical parameters and section identifiers of all line sections; And analyzing and processing the group of characteristic parameters and the network topology data through a preset evaluation model to generate the signal analysis result, wherein the signal analysis result is used for identifying the potential leakage probability of each line section in the target power distribution network.
  3. 3. The method according to claim 2, wherein filtering and feature parameter extraction of the zero sequence current signal by the analysis control module results in a set of feature parameters characterizing signal characteristics, comprising: Performing power frequency filtering and band-pass filtering on the zero sequence current signal through the analysis control module to obtain a power frequency component and at least one non-power frequency component of a preset non-power frequency band; Calculating the current effective value of the power frequency component, and calculating the frequency band energy value with the highest signal energy in the non-power frequency component of the at least one preset non-power frequency band; Calculating waveform distortion rate and dynamic fluctuation coefficient of the zero sequence current signal based on waveform sampling data of the zero sequence current signal, wherein the dynamic fluctuation coefficient represents the ratio of the average value of the signal peak value and the signal valley value of the zero sequence current signal to the signal effective value in a preset time length; and obtaining the group of characteristic parameters based on the current effective value, the frequency band energy value, the waveform distortion rate and the dynamic fluctuation coefficient.
  4. 4. The method according to claim 2, wherein the analyzing the set of characteristic parameters and the network topology data by a preset evaluation model to generate the signal analysis result includes: Inputting the set of characteristic parameters into the preset evaluation model, wherein the preset evaluation model is an evaluation model trained based on historical fault data, the preset evaluation model comprises a preset characteristic area association database, and the preset characteristic area association database stores historical association weights of different characteristic parameter combinations and each line section; Acquiring the potential leakage probability corresponding to each line section output by the preset evaluation model based on the historical association weight and the electrical parameter of each line section in the network topology data; and taking the line section with the potential leakage probability larger than a preset probability threshold as the potential leakage region to obtain the signal analysis result.
  5. 5. The method according to claim 1, wherein controlling the high-altitude signal sensing unit (30) and the auxiliary environment sensing unit (40) to cooperatively perform signal detection in the potential leakage area to obtain leakage detection data includes: The high-altitude signal induction unit (30) is controlled to conduct non-contact signal induction on the overhead line in the potential leakage area, and first characteristic signal intensity data of each line section are obtained; Determining a target section to be detected based on the first characteristic signal strength data; Controlling the auxiliary environment sensing unit (40) to perform near field signal sensing on the ground environment objects associated with the target section, and acquiring second characteristic signal intensity data of each ground environment object; and obtaining the electric leakage detection data based on the first characteristic signal intensity data and the second characteristic signal intensity data.
  6. 6. The method of claim 5, wherein the analyzing the leakage detection data by the analysis control module to determine the location of the leakage fault point of the target power distribution network comprises: sorting the first characteristic signal intensity data corresponding to each detection point in the leakage detection data based on the current flow direction of the circuit in the potential leakage area; when the signal intensity attenuation rate between adjacent detection points is larger than a preset attenuation threshold value, determining an area between two adjacent detection points corresponding to the signal intensity attenuation rate as a fault positioning interval; And determining the position of the ground environment object corresponding to the maximum intensity value in all the second characteristic signal intensity data in the fault locating interval as the position of the electric leakage fault point.
  7. 7. The method of claim 1, wherein prior to said controlling said signal injection module to inject a feature detection signal into said target power distribution network, said method further comprises: controlling the high-altitude signal induction unit (30) or the auxiliary environment induction unit (40) to scan the background electromagnetic spectrum in the region to be detected, and obtaining the background noise intensity of each frequency point in a preset frequency range; Calculating candidate scores of the frequency points based on the background noise intensity and the signal propagation efficiency coefficient of the frequency points, wherein the candidate scores are in negative correlation with the background noise intensity and in positive correlation with the signal propagation efficiency coefficient; and configuring a frequency point corresponding to the maximum candidate score as the working frequency of the characteristic detection signal.
  8. 8. A low-voltage leakage fault locating system is characterized by comprising one or more processors and a memory, wherein the memory is coupled with the one or more processors and is used for storing calculation Computer program code comprising computer instructions that are invoked by the one or more processors to cause the low voltage leakage fault localization system to perform the method of any of claims 1-7.
  9. 9. A computer readable storage medium comprising instructions which, when run on a low voltage leakage fault location system, cause the low voltage leakage fault location system to perform the method of any of claims 1-7.
  10. 10. A computer program product, characterized in that the computer program product, when run on a low-voltage earth-leakage fault localization system, causes the low-voltage earth-leakage fault localization system to perform the method according to any of claims 1-7.

Description

Low-voltage leakage fault positioning method, system, medium and product Technical Field The application relates to the technical field of electric power detection, in particular to a low-voltage leakage fault positioning method, a system, a medium and a product. Background The low-voltage distribution network, in particular to a 0.4kV overhead line, is widely distributed in urban and rural areas, and has complex running environment and frequent leakage faults. The traditional fault investigation mainly relies on manual pole climbing inspection or sectional power failure test, and the method has low efficiency, influences power supply of users, has higher operation safety risk, and is difficult to realize uninterrupted, rapid and safe electric leakage positioning. Prior art schemes for live detection by signal injection typically include a host (10) capable of generating and injecting a signal of a particular frequency, and one or more portable receiving devices for detecting the signal. During operation, the characteristic signals are applied to the power distribution system, the detection personnel carry the receiving equipment to move along the line, and the approximate direction of the fault point is judged by monitoring or observing the signal intensity change indicated by the receiving equipment. The method avoids full line power failure and improves the detection flexibility to a certain extent. However, since the entire detection process lacks initial judgment of the fault range, the detection personnel usually need to perform a comprehensive signal intensity scan on the entire possible line paths from the signal injection point to find the signal mutation position. This "start to end" piecewise scanning approach is time consuming in complex multi-branch lines. Meanwhile, the accurate identification of effective characteristic signals can be influenced by stray signal interference in the environment, so that the accuracy of positioning and the success rate of one-time positioning are challenges. In the low-voltage distribution network leakage live positioning process, the initial detection range is effectively narrowed, so that the positioning efficiency and reliability are improved. Disclosure of Invention The embodiment of the application provides a low-voltage leakage fault positioning method, a system, a medium and a product, which are used for solving the technical problem of how to improve the efficiency and reliability of low-voltage leakage positioning. In a first aspect, an embodiment of the present application provides a low-voltage leakage fault location method, which is applied to a low-voltage leakage locator, where the low-voltage leakage locator includes a host 10, a flexible zero-sequence current detection unit 20, a high-altitude signal induction unit 30, and an auxiliary environment induction unit 40, the host 10 includes a signal injection module and an analysis control module, a signal output end 21 of the flexible zero-sequence current detection unit 20 is detachably and electrically connected to a signal input end 11 of the host 10 through an adapter cable, and the high-altitude signal induction unit 30 and the auxiliary environment induction unit 40 are respectively connected to the host 10 in a wireless communication manner, where the method includes: acquiring a zero sequence current signal at a neutral line grounding downlead of a low-voltage side of a distribution transformer of a target power distribution network through the flexible zero sequence current detection unit 20; analyzing the zero sequence current signal through the analysis control module to obtain a signal analysis result; Generating leakage pre-judging information when the signal analysis result represents that a potential leakage area exists; The analysis control module controls the signal injection module to inject a characteristic detection signal into the target power distribution network based on the electric leakage pre-judging information, and controls the high-altitude signal induction unit 30 and the auxiliary environment induction unit 40 to cooperatively detect signals in the potential electric leakage area to obtain electric leakage detection data; And analyzing the electric leakage detection data through the analysis control module, and determining the position of the electric leakage fault point of the target power distribution network. Optionally, the analyzing the zero sequence current signal through the analyzing control module to obtain a signal analysis result includes filtering and extracting characteristic parameters of the zero sequence current signal through the analyzing control module to obtain a group of characteristic parameters representing signal characteristics, obtaining network topology data of the target power distribution network, wherein the network topology data comprise electrical parameters and section identifiers of all line sections, analyzing and processing the group