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Method and system for testing inter-phase coupling capacitance of lightning arrester based on different-frequency method

A technology of interphase coupling capacitance and testing method, which is applied in the field of measurement, can solve the problems of not effectively reflecting the deterioration trend of the arrester resistance sheet, failing to effectively check the internal defects of the arrester, and the decrease of the resistive component of the leakage current of the arrester, so as to avoid frequency interference, strong anti-interference ability, and the effect of ensuring equivalence

Active Publication Date: 2018-06-19
广东电网有限责任公司惠州供电局
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Problems solved by technology

In 2012, newly purchased lightning arrester live test equipment with strong anti-interference ability, the resistive component of the lightning arrester leakage current dropped significantly, the maximum drop was 36.2% of phase A, and the test results were qualified. The live test results have certain deviations due to different instruments. Failure to effectively reflect the deterioration trend of the arrester resistors, ultimately failing to effectively check the internal defects of the arrester, resulting in accidents
[0010] Due to the above-mentioned shortcomings in the existing lightning arrester live test technology, the validity of the current live test data is insufficient

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  • Method and system for testing inter-phase coupling capacitance of lightning arrester based on different-frequency method
  • Method and system for testing inter-phase coupling capacitance of lightning arrester based on different-frequency method

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[0028] The accompanying drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, certain components in the accompanying drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art It is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The positional relationship described in the drawings is for illustrative purposes only, and should not be construed as a limitation on this patent.

[0029] figure 1 Shown are the steps of a live test method for early defects of arresters based on full current harmonic vectors. Taking the measurement of the phase-to-phase coupling capacitance of the A and B phase arresters as an example, the measurement method includes the steps that the upper ends of the A and B phase arresters are suspended in the air, the lower end of the B pha...

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Abstract

The invention relates to the technical field of measurement, in particular to a method and a system for testing inter-phase coupling capacitance of a lightning arrester based on a different-frequencymethod. By adopting a different-frequency measurement method and matching a frequency-selective measurement device with high accuracy and strong interference resistance, accurate measurement of the inter-phase coupling capacitance of the lightning arrester can be realized; through the method and the system, disclosed by the invention, the purpose of simple and safe testing can be achieved, and themethod and the system are expected to be a solution for safely, simply, efficiently and accurately measuring the inter-phase coupling capacitance of the lightning arrester.

Description

technical field [0001] The present invention relates to the technical field of measurement, and more specifically, to a method and system for testing the interphase coupling capacitance of an arrester based on the different frequency method. Background technique [0002] The capacitive current compensation method, which is currently the mainstream test method in the lightning arrester live test, does not take the PT secondary signal for safety reasons, or instead takes the station variable reference voltage, which brings large principle errors and on-site phase-to-phase interference. Due to reasons such as equipment and equipment, the resistive current value cannot be accurately measured, and even misjudgments and missed judgments may occur, which affects the effectiveness of the live test technology for the diagnosis of arrester defects. [0003] The capacitive current compensation method is currently the most mature method in principle in live testing of arresters. By taki...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R27/26
CPCG01R27/2605
Inventor 彭刚李谦唐松平董玉玺彭杰文志强林志明柯祖梁王俊星黄穗雯杨韬蔡建峰范润晖文豹刘圣杰李冲陈晓静
Owner 广东电网有限责任公司惠州供电局
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