自触发紫外预电离开关脉冲击穿时延抖动影响因素及改进方法

研究了一种自触发紫外预电离开关击穿时延抖动特性的影响因素，结果表明:触发间隙电容放电阶段起预电离作用时，预电离注入时刻开关电场是开关时延抖动的决定性因素，提高工作系数和采用逸出功更低的电极材料对降低开关在脉冲峰值附近击穿时的时延抖动效果有限。提出的改进方法为:减小开关均压电阻阻值，显著延长触发间隙的有效燃弧时间，消除预电离注入时间及抖动的影响。采用改进方法时可以使开关在工作电压300～800 kV、前沿100 ns、180 ns的脉冲峰值附近击穿时的时延抖动分别小于1.3 ns、2.8 ns。

Influence factors of the pulsed breakdown time delay jitter of a self-triggered UV-illuminated switch and an improvement method

Influence factors of the breakdown delay jitter of a self-triggered UV-illuminated switch are studied. It indicates that the switch electric field at the injection time of pre-ionization is the decisive factor of the time jitter when the capacitor discharge stage of the trigger gap works. Increasing the operating coefficient and using electrode material with lower working function cannot remarkably reduce the time jitter when the switch breaks down near the peak time. The improvement method is to reduce the value of parallel resistors, which can extend the duration of sufficient arcing of the trigger gap and eliminate the influence of pre-ionization injection time and its jitter. By adapting this method, the time jitter is less than 1.3 ns or 2.8 ns under a pulse rise time of 100 ns or 180 ns when the operating voltage is 300?800 kV.