研制了一种电晕放电均压的小型多间隙串联气体开关, 分析了电晕放电在开关工作过程中的作用, 开展了开关自击穿特性、电晕放电伏安特性、针尖烧蚀以及开关寿命测试等特性实验。结果表明: 老练后开关自击穿电压标准偏差小于3.5%, 电晕均压效果明显; 随着放电次数增加, 电晕针尖逐渐钝化, 触发性能变化不大; 开关电晕放电电流随耐受电压升高增大, 增长趋势逐渐变快; 开关充400 kPa干燥空气, ±100 kV工作电压下开关放电50 000次以上, 触发性能稳定, 触发击穿时延抖动约4.3 ns, 自放电概率低于1×10-4。

A multi-gap gas switch with corona discharge for voltage balance is developed. The self-breakdown characteristics of the switch at different gas pressures, the voltage-current characteristics of corona discharge, the needle erosion and the switch life time are studied respectively. The experiment results show that after conditioning the switch self-breakdown voltage relative standard deviation is less than 3.5%, the voltage balance has good effect. The voltage-current characteristics line of multi-gap corona discharge is similar to a parabola form. When the switch is pumped 400 kPa dry air and the work voltage is ±100 kV, the switch lifetime can reach more 50 000 times, the jitter of the switch breakdown delay time is about 4.3 ns, the per fire probability of the switch can be lower than 1×10-4.