气体开关触发间隙与过压间隙击穿特性研究

为研究快脉冲直线变压器驱动源（FLTD）多间隙气体开关的触发击穿特性，针对一种环形电极两间隙等效实验开关，开展不同触发电压、工作系数和电极材料下的击穿特性实验，对比两个间隙的击穿延时和抖动，分析间隙击穿特性的主要影响因素和作用机制。实验结果表明：触发间隙击穿延时主要受触发电压影响，而工作系数是过压间隙击穿延时的主要影响因素；开关抖动主要来自于触发间隙，触发间隙抖动随触发电压的增大明显减小，过压间隙抖动基本不随触发电压和工作系数变化且维持在较低值；石墨电极开关的击穿延时和抖动明显小于不锈钢、黄铜和钨铜电极开关，具有良好的触发击穿性能。通过分析指出，是否有预电离可能是两个间隙击穿特性差异的主要原因。

Study on Breakdown Characteristic of Trigger Gap and Overvoltage Gap in Gas Switch

In order to study the trigger breakdown characteristics of the fast pulsed linear transformer driver (FLTD) multi-gap gas switch, a two-gap equivalent gas switch was studied under different trigger voltages, working coefficients and electrode materials. The delay and jitter of the trigger gap and overvoltage gap were gained, and the main factors affecting the breakdown characteristics were analyzed. The experimental results show that the delay of the trigger gap is mainly influenced by trigger voltage, and the delay of the overvoltage gap is mainly influenced by working coefficient. The jitter of the switch mainly comes from the trigger gap. The jitter of trigger gap decreases with the increase of the trigger voltage, while the jitter of overvoltage gap is not affected by trigger voltage and working coefficient and maintains at a low value. The switch with graphite electrode has better trigger characteristics and lower delay and jitter. Preionization may be the main reason for the different breakdown characteristics of the two gaps.