多间隙气体开关绝缘子寿命

Lifetime of insulator used for multi-gap gas switch

针对设计的一种堆栈式结构多间隙气体开关,分析了绝缘子污染对开关寿命的影响机理。对绝缘子表面电场分布进行了模拟计算,实验研究了绝缘子污染对开关自击穿电压的影响,得到了开关自击穿电压和绝缘子表面绝缘电阻的变化规律,开关在放电电流32kA实验条件下工作13 000次后,自击穿电压平均值由171.5kV降低至130.8kV,绝缘子表面绝缘电阻由200GΩ下降至22.6GΩ,绝缘子已无法正常使用。同时提出了提高绝缘子抗污染能力、延长绝缘子寿命的措施和方法。

This paper summarizes an experimental study on lifetime of the insulator used for multi-gap gas switch.The mechanism of the insulator lifetime being reduced because of pollution is analyzed.The distribution of static electric field on insulator surface is simulated.The change of self-breakdown voltage and surface resistance due to pollution is experimentally obtained.After 13 000 shots under the discharge current of 32 kA,the self-breakdown voltage reduces from 171.5 to 130.8 kV and the surface resistance reduces from 200 to 22.6 GΩ,which means the insulator can not operate normally.The measures for prolonging lifetime of the insulator are put forward.