Composite insulated metallic oxide arrester

Abstract

The invention discloses a composite insulated metallic oxide arrester which comprises a hollow insulation pipe (2), an umbrella skirt sleeve (3), a first metal end plate (4), a second metal end plate(5), a first metal elastomer (6), a discharge gap structure, a second metal elastomer (7) and zinc oxide resistance pieces (8) which are arranged in a stacking manner; the first metal elastomer (6), the discharge gap structure, the second metal elastomer (7) and the zinc oxide resistance pieces (8) are axially arranged in the hollow insulation pipe from top to bottom; and the first metal elastomer, the discharge gap structure, the second metal elastomer and the zinc oxide resistance chips are all form gaps (9) with the hollow insulation pipe in a radial direction of the hollow insulation pipe.By adopting variable series gap composite insulated metallic oxide arrester, during normal running, lightning overvoltage and operation overvoltage allowed by running voltage and electrical equipmentcan not be applied to the zinc oxide resistance chips, so that the phenomena of electrical aging and thermal destruction caused by long-term electrification are avoided, and meanwhile, the problem ofarcs caused by sustaining current between adjacent series gaps after overvoltage disappears can also be prevented.

Description

technical field [0001] The invention relates to the technical field of overvoltage protection for power transmission and transformation equipment in a power system, in particular to a composite insulating metal oxide arrester. Background technique [0002] Surge arresters are used to protect electrical equipment in the power system from lightning overvoltage damage or to avoid internal overvoltage damage caused by equipment operation. It is an important protection device related to the safe and stable operation of the power system. As the voltage level increases, the problems of lightning overvoltage and operating overvoltage become increasingly prominent, and it is particularly important to improve the operating performance of arresters. [0003] The existing gapless metal oxide arrester generally has a structure in which a plurality of resistor plates are stacked between two metal electrodes without intermediate gaps. It has a very high resistance when the voltage is norm...

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the above-mentioned deficiencies in the prior art, and provide a composite insulating metal oxide arrester, which avoids the problem that the traditional gapless metal oxide arrester is prone to electrical aging of the resistance sheet and causes thermal damage, and at the same time It can solve the problem of freewheeling arc after the overvoltage disappears in the traditional series gap arrester, and improve the service life and performance reliability of the metal oxide arrester

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