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Method for measuring resistive current of metal oxide lightning arrester

A technology of resistive current and lightning arrester, which is applied in the direction of measuring current/voltage, measuring electrical variables, measuring devices, etc., and can solve problems such as error influence of compensation gain, voltage transformer angle difference of measurement results, safety issues, etc.

Inactive Publication Date: 2015-11-11
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +2
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Problems solved by technology

This method needs to introduce a voltage reference signal from the PT, and the measurement result is easily affected by the error of the voltage transformer angle difference and compensation gain, and brings safety problems

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  • Method for measuring resistive current of metal oxide lightning arrester
  • Method for measuring resistive current of metal oxide lightning arrester
  • Method for measuring resistive current of metal oxide lightning arrester

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Embodiment Construction

[0017] In order to make the purpose of the invention, technical solution and beneficial technical effects of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementations described in this specification are only for explaining the present invention, not for limiting the present invention.

[0018] The method for measuring the resistive current of metal oxide arrester of the present invention comprises steps: (1) utilize electric field induction plate to collect voltage signal; (2) utilize coil sensor to collect the leakage current signal of arrester bottom; (3) collect voltage signal and The current signals are respectively amplified and filtered; (4) The third harmonic value of the resistive current of the arrester is calculated according to the capacitive current compensation method, and the fundamental w...

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Abstract

The invention discloses a method for measuring resistive current of a metal oxide lightning arrester. The method comprises steps of (1) utilizing an electric field sensor board to collect a voltage signal, (2) utilizing a coil sensor to collect a leakage current signal on the bottom of the lightning arrester, (3) performing amplification and filtering on the collected voltage signal and the current signal, (4) calculating a third harmonic value of the resistive current of the lightening arrester according to a capacitative current method and calculating a fundamental wave value of the resistive current of the lightning arrester according to a vector projection method. The invention adopts the electric field induction method to collect the induction quantity of the voltage applied on two ends of the lightening arrester so as to safely obtain the fundamental wave of the resistive current of the lightening arrester which is running on line and the third harmonic value.

Description

technical field [0001] The invention relates to the on-line monitoring technology of the lightning arrester in the power system, and more specifically relates to a method for measuring the resistive current of the metal oxide lightning arrester. Background technique [0002] Metal oxide surge arresters are important overvoltage protection devices in power systems. Faults such as moisture and aging may occur during on-site operation. In severe cases, it may even cause the explosion of the arrester, which seriously threatens the normal operation of the power system. Therefore, online monitoring of surge arresters in operation has become one of the necessary means for condition-based maintenance of power systems. [0003] There are many characteristic physical quantities that can be selected for online monitoring of arresters, among which the resistive current can well reflect the operating state of the arrester, and the performance of the arrester can be judged according to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
Inventor 蔡汉生贾磊赵冬一胡上茂王家军刘刚陈喜鹏施健
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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