Metal oxide arrester multiple-lightning-current withstand test method

Abstract

Provided is a metal oxide arrester multiple-lightning-current withstand test method which comprises the steps of selecting a valve plate and recording a test environment, recording the performances of the valve plate before test, determining parameters for multiple lightning current applying, recording the test process in which multiple lightning current impulse is applied to the valve plate, measuring the performances of the valve plate after test and evaluating the capability of the valve plate to withstand multiple lightning current. According to the metal oxide arrester multiple-lightning-current withstand test method provided by the invention, the situation of an arrester under the action of actual lightning current including first lightning current, subsequent lightning current and immediate long-time lightning current can be simulated, and the test method is feasible.

Description

technical field [0001] The invention relates to a metal oxide arrester test technology, in particular to a metal oxide arrester multiple lightning current withstand test method. Background technique [0002] Surge arresters are effective lightning protection measures widely used on distribution lines. Due to their large number of installations and wide distribution range, their life evaluation, test methods, and operation and maintenance programs have always been the key points in the operation and maintenance, status evaluation, and asset management of power systems at home and abroad. problems faced. Operation experience at home and abroad shows that lightning strike itself is the most important cause of lightning arrester failures in distribution lines, and the characteristics of arresters under actual lightning current impact are key issues in terms of operating state evaluation, test methods, protection effects, and coordination methods. Lightning observations at home ...

AI Technical Summary

Problems solved by technology

These test methods can only simulate a single pulse, and the minimum time interval for multiple repeated tests is 10s, which is much longer than the time interval of actual multiple lightning strikes, and cannot simulate the accumulation of electrodynamic and thermal effects caused by actual multiple lightning strikes

Due to the cumulative effect of the impact current on the zinc oxide non-linear resistance, multiple current impacts with an interval of ms or even μs are obviously much more severe than a single current impact, so some zinc oxide that has passed the single impact current test Overvoltage protection devices often suffer from impact aging damage in actual use, failing to achieve the purpose of overvoltage protection, and even causing system accidents due to their own faults

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