研制了大电流、大库仑两电极气体开关,并研究了其静态特性,给出了开关自击穿概率拟合公式。结果显示:自击穿电压与工作气压基本呈线性递增关系;随着气压的升高,自击穿电压的分散性逐渐增大。数值模拟和实验对比显示,开关自击穿电压的分散性基本满足两参数威布尔分布。该项研究成果能够为选择开关的工作电压及充气压力提供参考,以满足能源系统可靠性的要求。

A high-Coulomb two-electrode spark gap switch was developed. Its static characteristic was studied and the fitting formula for its self-breakdown probability was derived. It is found that the self-breakdown voltage increases linearly with the working gas pressure,and the voltage becomes more dispersive as the pressure increases. The comparison results between numerical simulation and experiments show that,the self-breakdown probability agrees well with the Welbull relationship with two parameters. This work could be a reference for the selection of switch working pressure and inflated-gas pressure,which meets the stability demand of the power conditioning system.