快前沿直线脉冲变压器多间隙气体开关直流自击穿特性

Self-breakdown charicteristic of multi-gap switch for fast linear transformer driver

针对一种用于快前沿直线脉冲变压器（FLTD）的堆栈式多间隙气体开关,研究了电极表面粗糙度、电场不均匀系数、放电电流、气体压强等因素对开关自击穿电压分散性的影响。电极表面粗糙度0.1-0.8μm时,击穿电压平均值没有明显变化,击穿电压分散性小于1.5%;电场不均匀系数为1.20和1.30时,电极烧蚀均匀,开关自击穿电压分散性小于2.0%;放电电流由1.1 kA增加到30.0 kA时,击穿电压的分散性增加了约2倍,电极烧蚀的作用明显增强;工作气压由0.04 MPa增加到0.30 MPa,击穿电压的分散性由1.5%增加到3.6%。初步分析了降低开关自击穿电压分散性的途径和方法。

The effects of surface roughness,field enhancement factor,current and gas pressure on self-breakdown voltage of a stackable multi-gap switch used for fast linear transformer driver are investigated.The mean self-breakdown voltage has no remarkable change and the dispersancy of self-breakdown voltage is under 1.5% when the surface roughness is 0.4 μm to 0.8 μm.The electrode erosion is symmetrical and the dispersancy of self-breakdown voltage is under 2.0% when the field enhancement factor is 1.20 and 1.30.The dispersancy of self-breakdown voltage increase almost two times as the current is changed from 1.1 kA to 30.0 kA.The dispersancy of self-breakdown voltage increases from 1.5% to 3.6% when the gas pressure is changed from 0.04 MPa to 0.30 MPa.Some methods of reducing the dispersancy of self-breakdown voltage are proposed.