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CN-121978483-A - GIS partial discharge automatic positioning and processing method

CN121978483ACN 121978483 ACN121978483 ACN 121978483ACN-121978483-A

Abstract

The invention relates to the technical field of power equipment detection, in particular to a GIS partial discharge automatic positioning and processing method. The method comprises the following steps of S1, building a GIS simulation model, S2, extracting an original signal to conduct effective judgment, S3, calculating a discharge position according to the effective signal, S4, grading the signal and determining a final discharge position, S5, conducting dynamic discharge position updating operation, S6, determining an early warning grade and taking corresponding measures. The invention has the advantages that the electromagnetic wave speed is corrected by introducing temperature and pressure, the positioning accuracy can be effectively improved, the loss of an AI model can be effectively reduced by signal grading treatment, the cost is reduced, the development trend of a partial discharge source can monitor the influence area of the discharge source in a targeted manner, on one hand, the monitoring strength is improved, on the other hand, the resource loss in an irrelevant area is reduced, and the cost is further reduced by early warning grading treatment on the basis of ensuring the effective treatment of the discharge source.

Inventors

  • ZHAO HONGYI
  • SHEN DAOYI
  • HU YONG
  • TIAN GUANGLIANG
  • WANG HAI
  • Qian Dazhao

Assignees

  • 上海格鲁布科技有限公司

Dates

Publication Date
20260505
Application Date
20260306

Claims (10)

  1. 1. The GIS partial discharge automatic positioning and processing method is characterized by comprising the following steps: s1, building a GIS simulation model; S2, extracting an original signal to perform effective judgment; s3, calculating a discharge position according to the effective signal; S4, grading the signals, and determining the final discharge position; S5, performing dynamic discharge position updating operation; s6, determining the early warning level and taking corresponding measures.
  2. 2. The automatic positioning and processing method for GIS partial discharge according to claim 1, wherein the detailed procedure of step S1 is as follows: S101, performing geometric modeling in SolidWorks to construct a three-dimensional model, wherein the model comprises a GIS core detection related structure comprising a pipeline outer surface, an insulating basin and key functional components, wherein the key functional components comprise a circuit breaker, a bus, a connector and an isolating switch; Marking a sensor deployment position, marking a 'sensor mounting point' on a detectable position such as an unshielded insulator rim, an observation window and the like, and recording a unique number and a three-dimensional coordinate of the mounting point; labeling the attribute of the parts, and labeling the type and the material of each part; labeling fixed dimension parameters, including the length of each part, the turning angle of the pipeline, the distance between the mounting holes of the sensor and the path length along the pipeline between adjacent mounting points; s102, adding supplementary information; The supplementary information comprises simulation scenes, electromagnetic wave propagation speed and component attenuation coefficients; The simulation scene comprises a temperature scene, a pressure scene and a partial discharge source position scene, wherein the partial discharge source position scene covers all key areas of the GIS, including the inside of an insulator, the center of a bus, the inside of a breaker bin, a pipeline turning position and a joint connection position; the electromagnetic wave propagation speed library corrects the wave speed of the electromagnetic wave according to the temperature and the pressure: (1); Wherein, the In order to correct the wave velocity of the electromagnetic wave, Is the wave velocity of the electromagnetic wave under the standard working condition, 、 The current air pressure and the current temperature are respectively, 、 The air pressure and the temperature corresponding to the standard working conditions are respectively; the expression of the component attenuation coefficient is: (2); Wherein, the Is the first The attenuation coefficient of the individual components is set, Is the basic attenuation coefficient at the standard temperature, Is the first The temperature sensitivity coefficient of the individual components, Is the first The mathematical expression of the aging coefficient is as follows: (3); Wherein, the As a function of the time-aging coefficient, For the operational life of the device, As a factor of the ageing of the load, Is the first The segment load is operated at a load level, Is the first The operational life of the segment load is limited, For the ageing coefficient of the special working condition, The times are special working conditions; For parts which work under high humidity for a long time, humidity aging coefficients are introduced into the attenuation coefficients of the parts for correction, and the mathematical expression is as follows: (4); Wherein, the As the coefficient of humidity ageing, the temperature and humidity ageing, Is the first Average relative humidity over the year; For a metal part, the vibration aging coefficient is introduced into the part attenuation coefficient to be corrected, and the mathematical expression is as follows: (5); Wherein, the In order to obtain the vibration ageing coefficient, Is the first Average vibration acceleration of the device over the years; if the metal component works in a high humidity environment for a long time, the humidity aging coefficient and the vibration aging coefficient are simultaneously introduced into the component attenuation coefficient; amplitude after electromagnetic wave attenuation The expression of (2) is: (6); Wherein, the In order to attenuate the amplitude of the electromagnetic wave before attenuation, In order to adjust the coefficient of the coefficient, For the number of components corresponding to the component attenuation coefficient, The attenuation of the component, when there are a plurality of components on one path to attenuate electromagnetic wave, The expression of (2) is: (7); Wherein, the The total amount of attenuation for the component; s103, constructing a real fault information base which comprises historical positioning data, partial discharge signal characteristics, equipment structure parameters and overhaul actual measurement data.
  3. 3. The automatic positioning and processing method for GIS partial discharge according to claim 2, wherein the detailed procedure of step S2 is as follows: S201, acquiring multi-mode data including electromagnetic wave signals, ultrasonic signals, vibration signals, local temperature data and gas concentration data S202, preprocessing a hierarchical signal; for an electromagnetic wave signal, an interference suppression operation is performed thereon, expressed as follows: (8); Wherein, the In order to suppress the signal after the interference, For the electromagnetic wave signal collected by the UHF sensor, For the ambient interference signal acquired by the reference sensor, The adaptive filtering weight at the current moment; and updating and iterating the adaptive filtering weight, wherein the expression is as follows: (9); Wherein, the For the adaptive filtering weights at the next instant, Is a step size coefficient; for weak signals, enhancement operations are performed on them as follows: (10); Wherein, the In order to achieve the magnification of the image, Is the mean value of the amplitude of the signal, Is the signal full scale amplitude; multiplying the signal by the corresponding amplification factor to obtain an enhanced signal; The amplified signal is subjected to characteristic reconstruction operation, and the expression is as follows: (11); Wherein, the The signal after the reconstruction is used for the signal, In order to amplify the signal after it has been amplified, Reconstruction function, representing signal phase And pulse rise time Inherent association relation between the two; the multipath correction operation is carried out on the electromagnetic wave signal, specifically: Based on the three-dimensional topological structure of the GIS pipeline, the time difference between the direct propagation path and the reflection path of the electromagnetic wave is calculated, and the expression is as follows: (12); Wherein, the As a result of the multipath time difference, For the length of the reflection path, Is the direct path length; The signal is corrected according to the multipath time difference, and the expression is as follows: (13); Wherein, the A signal corrected for multipath time differences; S203, finding out a sensor A with earliest acquisition time, marking the position as a point A, and recording the frequencies of all sub-signals in the point A; s204, carrying out primary screening on the sub-signals in the residual sensors, and screening out the sub-signals with the frequency not in the A; s205, determining an effective signal according to the attenuation rate, namely calculating the attenuation rate on a line between adjacent sensors according to the amplitude values of the sub-signals, and combining the attenuation rate in the simulation model to obtain the following judgment formula: (14); Wherein, the 、 Respectively adjacent sensors And The actual decay rate and the model decay rate of the line between, Judging a threshold value for attenuation; when the attenuation rate of the sub-signal meets a judging formula, determining the sub-signal as an effective sub-signal, and superposing all the effective sub-signals to obtain an effective signal; If no valid sub-signal exists, indicating that no fault occurs, and continuing monitoring; s206, recording the power amplitude of the effective signal at the point A And calculates the noise intensity.
  4. 4. A method for automatically positioning and processing partial discharge of a GIS according to claim 3, wherein the noise intensity is The expression of (2) is: (15); Wherein, the The power of the noise is calculated and, Is the effective signal power amplitude.
  5. 5. The automatic positioning and processing method for GIS partial discharge according to claim 1, wherein the detailed procedure of step S3 is as follows: S301, calculating a rough estimation discharge position by using a TDOA time difference method; S302, correcting the rough estimated discharge position by using a correction model to obtain a corrected estimated discharge position, wherein the distance between the corrected estimated discharge position and the point A is : (16); Wherein, the To roughly estimate the distance of the discharge location from point a.
  6. 6. The method for automatically positioning and processing partial discharge of GIS according to claim 4, wherein in step S4, the signal classification criteria are as follows: the primary signal is based on the signal meeting the power amplitude And noise intensity ; The standard of the secondary signal is that the signal meets the power amplitude Noise intensity Wherein the signal does not meet the classification standard of the three-level signal; The standard of the three-level signal is that the signal meets the power amplitude Or noise intensity One of the conditions in (a).
  7. 7. The automatic positioning and processing method for GIS partial discharge according to claim 1, wherein the detailed procedure of step S5 is as follows: s501, predicting the development trend of the partial discharge source by using a prediction model, wherein the output of the prediction model is the amplitude increasing rate of the partial discharge source in the future T time period Rate of frequency increase Expanding a prediction direction; s502, determining an expansion prediction area of a future time period T according to the wave speed of the attenuated electromagnetic wave; s503, setting a safe distance Closing the sensor meeting the safety condition, and simultaneously increasing the sampling frequency of the sensor not meeting the safety condition; The safety conditions are as follows: (17); Wherein, the Is taken as a point Minimum distance from the extended prediction region.
  8. 8. The method for automatically positioning and processing GIS partial discharge according to claim 6 or 7, wherein in step S4, the processing procedure of the signals of different levels is as follows: For the first-level signal, directly taking the roughly estimated discharge position as a final discharge position, and ending the positioning process; for the secondary signal, taking the corrected estimated discharge position as a final discharge position, and ending the positioning process; for the three-stage signal, the corrected estimated discharge position is taken as the final discharge position, and then the process proceeds to step S5.
  9. 9. The method for automatically positioning and processing partial discharge of GIS according to claim 7, wherein the early warning level is divided into primary early warning, intermediate early warning and advanced early warning; The primary early warning needs to meet the following requirements: And is also provided with ; The medium-grade early warning needs to meet the following requirements: Or (b) And does not meet advanced early warning conditions; advanced early warning needs to meet: And is also provided with 。
  10. 10. The method for automatically positioning and processing partial discharge of a GIS according to claim 9, wherein the measures corresponding to the early warning level are: for primary early warning, the measures are that monitoring is continued; For intermediate early warning, the method comprises the steps of carrying out live inspection, arranging operation and maintenance personnel for field inspection, and checking whether the periphery of a partial discharge source is abnormal or not through infrared thermal imaging and ultrasonic auxiliary detection; planning maintenance, namely bringing the defect into a next round of power failure maintenance plan, and making a targeted maintenance scheme; The method comprises the steps of performing special emergency repair, starting an emergency maintenance flow, disassembling the part where the partial discharge source is located, solving the problem of faults, such as removing metal particles, replacing deteriorated insulating parts and repairing conductive parts with poor contact; And (3) performing multiple disc analysis, recording defect types, development processes and maintenance measures, updating a database, and optimizing a subsequent correction and prediction algorithm.

Description

GIS partial discharge automatic positioning and processing method Technical Field The invention relates to the technical field of power equipment detection, in particular to a GIS partial discharge automatic positioning and processing method. Background The Gas Insulated Switchgear (GIS) is widely applied to a power system due to the advantages of good insulativity, high reliability, small occupied space and the like. However, due to the influences of factors such as improper installation, switching action, external environment and the like, partial discharge defects are easy to generate in the GIS, insulation failure and equipment failure can be caused by long-term accumulation, and therefore partial discharge detection is very important to guaranteeing the safe operation of the GIS. The current mainstream GIS partial discharge positioning method is mainly a time difference positioning method, but the time difference positioning method needs to capture discharge signals, but GIS equipment operation environment is complex, and is easily influenced by external signals such as transformer spray cover discharge, environment electromagnetic radiation, interference of other electrical equipment and the like. Researchers introduce AI into the positioning method to achieve good results. However, AI prediction consumes much effort and is costly. Disclosure of Invention The invention mainly aims to provide a GIS partial discharge automatic positioning and processing method, which solves the problems in the background technology. In order to solve the technical problems, the technical scheme adopted by the invention is that the GIS partial discharge automatic positioning and processing method comprises the following steps: s1, building a GIS simulation model; S2, extracting an original signal to perform effective judgment; s3, calculating a discharge position according to the effective signal; S4, grading the signals, and determining the final discharge position; S5, performing dynamic discharge position updating operation; s6, determining the early warning level and taking corresponding measures. Further, the detailed procedure of step S1 is as follows: S101, performing geometric modeling in SolidWorks to construct a three-dimensional model, wherein the model comprises a GIS core detection related structure comprising a pipeline outer surface, an insulating basin and key functional components, wherein the key functional components comprise a circuit breaker, a bus, a connector and an isolating switch; Marking a sensor deployment position, marking a 'sensor mounting point' on a detectable position such as an unshielded insulator rim, an observation window and the like, and recording a unique number and a three-dimensional coordinate of the mounting point; labeling the attribute of the parts, and labeling the type and the material of each part; labeling fixed dimension parameters, including the length of each part, the turning angle of the pipeline, the distance between the mounting holes of the sensor and the path length along the pipeline between adjacent mounting points; s102, adding supplementary information; The supplementary information comprises simulation scenes, electromagnetic wave propagation speed and component attenuation coefficients; The simulation scene comprises a temperature scene, a pressure scene and a partial discharge source position scene, wherein the partial discharge source position scene covers all key areas of the GIS, including the inside of an insulator, the center of a bus, the inside of a breaker bin, a pipeline turning position and a joint connection position; the electromagnetic wave propagation speed library corrects the wave speed of the electromagnetic wave according to the temperature and the pressure: (1); Wherein, the In order to correct the wave velocity of the electromagnetic wave,Is the wave velocity of the electromagnetic wave under the standard working condition,、The current air pressure and the current temperature are respectively,、The air pressure and the temperature corresponding to the standard working conditions are respectively; the expression of the component attenuation coefficient is: (2); Wherein, the Is the firstThe attenuation coefficient of the individual components is set,Is the basic attenuation coefficient at the standard temperature,Is the firstThe temperature sensitivity coefficient of the individual components,Is the firstThe mathematical expression of the aging coefficient is as follows: (3); Wherein, the As a function of the time-aging coefficient,For the operational life of the device,As a factor of the ageing of the load,Is the firstThe segment load is operated at a load level,Is the firstThe operational life of the segment load is limited,For the ageing coefficient of the special working condition,The times are special working conditions; For parts which work under high humidity for a long time, humidity aging coefficients are introduced into the a