Gas insulated switchgear (GIS) partial discharge calibration method and system

A technology of partial discharge and discharge signal, applied in the direction of testing dielectric strength, etc., can solve the problems of positioning error of discharge part, large reading error, small first wave peak value of UHF signal, etc., achieve accurate and effective detection, avoid power equipment accidents, Avoid the effect of large reading errors

Active Publication Date: 2013-06-26
STATE GRID CORP OF CHINA +2
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  • Claims
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Problems solved by technology

[0004] However, the above-mentioned UHF-based partial discharge discharge location and discharge intensity detection method has the following problems: (1) At present, since only one UHF sensor is configured on each GIS interval, although people have proposed a time difference method, in most cases However, this method cannot be put into practical use; (2) Due to the small peak value of the first wave of the UHF signal and the complex background noise on site, the reading error at the initial moment of the first wave is very large, which in turn leads to great problems in th

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  • Gas insulated switchgear (GIS) partial discharge calibration method and system
  • Gas insulated switchgear (GIS) partial discharge calibration method and system
  • Gas insulated switchgear (GIS) partial discharge calibration method and system

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Embodiment 1

[0055] Embodiment 1 of the present invention discloses a GIS partial discharge verification method, please refer to Figure 4 , the GIS partial discharge verification method includes the following steps:

[0056] S1: Establish the partial discharge discharge location of each preset location in different preset locations in the GIS, the waveform oscillation rise time of the discharge signal of the partial discharge at the preset location in the GIS, and the discharge signal of the partial discharge at the preset location in the GIS The correspondence relation of the relative attenuation degree at the preset position, the correspondence relation of all preset positions forms a correspondence relation set, and the correspondence relation set is marked as a calibration data set.

[0057] Wherein, the above-mentioned preset position can specifically be the key position i of GIS, i=1, 2...n, n is a natural number not less than 1, and a series of key positions in GIS can be selected ...

Embodiment 2

[0069] The present invention discloses a GIS partial discharge verification system, which corresponds to the GIS partial discharge verification method disclosed in Embodiment 1. Please refer to Figure 5 , the GIS partial discharge verification system includes a calibration set establishment module 100, an actual measurement module 200 and a partial discharge index acquisition module 300, wherein:

[0070] The calibration set establishment module 100 is used to establish the discharge position of the partial discharge in each preset position in different preset positions in the GIS, the waveform oscillation rise time of the discharge signal of the partial discharge at the preset position in the GIS, the The corresponding relation of the relative attenuation degree of the partial discharge discharge signal at the preset position, the corresponding relation of all preset positions forms a corresponding relation set, and the corresponding relation set is marked as a calibration da...

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Abstract

The invention discloses a gas insulated switchgear (GIS) partial discharge calibration method and a system. The method comprises the steps of establishing a calibration data set, and calibrating a preset position of data in the data set in a GIS; measuring an actual waveform oscillation rising time and an actual maximum amplitude of GIS actual partial discharge on the preset position; comparing the actual waveform oscillating rising time and the actual maximum amplitude with the data in the calibration data set, and carrying out calculation, so as to acquire a discharge part and strength. Specifically, the calibration method disclosed by the invention can accurately measure the calibration data set and data of actual partial discharge through a sensor on the preset position, so that defects of arranging two sensors on each GIS interval and serious error of reading head wave initial time are avoided; in later stage, the discharge part and strength are obtained by simple comparison and calculation, which is free from limitation of an atlas database and overcomes shortcomings of the existing ultra high frequency (UHF) method that pattern recognition fails to accurately provide the discharge strength. Therefore, the calibration method disclosed by the invention can accurately and effectively detects discharge part and strength of partial discharge.

Description

technical field [0001] The invention belongs to the technical field of partial discharge detection and maintenance in electric power systems, and in particular relates to a GIS (Gas Insulated Switchgear, gas insulated switchgear) partial discharge verification method and system. Background technique [0002] Due to the advantages of small footprint, high operational reliability, small maintenance workload, and no electromagnetic interference, GIS has been widely used in my country's power system since the 1980s. With the increase of the number of GIS applications, there are more and more GIS security accidents, which have caused huge losses to the national economy. Among them, insulation defect is one of the important factors affecting the reliability of GIS. When there is insulation defect inside GIS, partial discharge will be generated under the action of high voltage. Therefore, partial discharge is an important symptom of insulation defect. If the internal insulation de...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 陈金法胡文堂徐华刘黎郑书生詹花茂刘岩李思南罗盛邱炜周国良
Owner STATE GRID CORP OF CHINA
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