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Arrester health state determination method based on volt-ampere characteristic curve analysis

A technology of volt-ampere characteristic curves and determination methods, which is applied in the direction of instruments, environmental/reliability tests, and measuring devices, which can solve problems such as thermal collapse and MOA accidents, achieve less measurement data, improve accuracy, and benefit The effect of maintenance and replacement

Inactive Publication Date: 2018-12-18
STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO +2
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Problems solved by technology

Once the MOV deteriorates to a certain extent and the heat generation capacity exceeds the heat dissipation capacity, thermal collapse will occur, leading to MOA accidents

Method used

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  • Arrester health state determination method based on volt-ampere characteristic curve analysis
  • Arrester health state determination method based on volt-ampere characteristic curve analysis
  • Arrester health state determination method based on volt-ampere characteristic curve analysis

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Embodiment Construction

[0015] The principles and solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] A method for judging the health state of an arrester based on the analysis of the volt-ampere characteristic curve, comprising the following steps:

[0017] Step 1. Carry out the aging and damp test, collect the grid voltage U and the corresponding leakage current I, take the voltage U as the abscissa, and the current I as the ordinate, and draw the volt-ampere characteristic curve of the MOA under the aging and damp conditions.

[0018] Step 2. Perform Fourier descriptor edge analysis on the volt-ampere characteristic curve under aging and damp conditions, and construct a Fourier descriptor data table under aging and damp conditions.

[0019] The edge analysis method of the Fourier descriptor is as follows: first, the current-voltage coordinate sequence on the volt-ampere characteristic curve is treated a...

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Abstract

The invention discloses an arrester health state determination method based on volt-ampere characteristic curve analysis. According to the method, first, an aging and moisture absorbing test is performed, a power grid voltage and a corresponding leakage current are collected, a volt-ampere characteristic curve of an MOA (Metal Oxide Surge Arrester) under aging and moisture absorbing conditions isdrawn, edge analysis of a Fourier descriptor is performed, and a Fourier descriptor data table under the aging and moisture absorbing conditions is created; second, a power grid voltage and a corresponding leakage current of the to-be-tested arrester are collected, a volt-ampere characteristic curve of the to-be-tested MOA is drawn, edge analysis of the Fourier descriptor is performed, and a Fourier descriptor data table under to-be-tested conditions is determined; and last, the Fourier descriptor data table under the to-be-tested conditions and the Fourier descriptor data table under the aging and moisture absorbing conditions are compared to judge the health condition of the arrester. Through the method, the health condition of the arrester can be analyzed quantitatively from the volt-ampere characteristic curves.

Description

technical field [0001] The invention relates to a power system safety control technology, in particular to a method for judging the health state of an arrester based on the analysis of the volt-ampere characteristic curve. Background technique [0002] Metal Oxide Surge Arrester (MOA) has the characteristics of good protection, large flow capacity and simple structure, and is widely used in power systems. [0003] Since the MOA bears the effect of the system voltage under normal operating conditions, a small resistive leakage current component flows through the zinc oxide valve (referred to as MOV) for a long time, causing the heating and deterioration of the MOV, which further aggravates the resistive current. MOV degradation. Once the MOV deteriorates to a certain extent and the heat generation capacity exceeds the heat dissipation capacity, thermal collapse will occur, leading to MOA accidents. Previous experimental research results show that the occurrence of MOA accid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
CPCG01R31/003
Inventor 郑许林张自伟衡思坤高赫王健新王伟华于跃吴茂刚
Owner STATE GRID JIANGSU ELECTRIC POWER CO LIANYUNGANG POWER SUPPLY CO
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