气体火花开关电阻特性

摘要

利用二极管输出电压约1 MV、脉宽约40 ns的重复频率Tesla型脉冲功率驱动源,对大间隙、高气压的重复频率氮气火花开关进行了实验研究.通过将开关等效为RLC电路,利用测量得到的形成线电压与锥形段电压来计算氮气火花开关电阻.电阻的变化情况是放电开始时刻比较大,随着放电通道的形成,电阻迅速变小,最终达到Ω级的阻值.通过计算值与理论公式推算值比较,检验Barannik,Rompe-Weizel.Demenik,Toeple,Vlastos公式适用性,并尝试对Rompe-Weizel公式常数项进行了修正.%A repetitive Tesla pulsed power generator with 1 MV, 40 us output was used to study the resistances of gas spark switch in nitrogen under high gas pressures and large gap. With the switch regarded as a RLC circuit ,the resistances were computed under different gas pressures, by using the measured voltages of the pulse forming line and conical transmission line- The results show that the resistances reduce quickly during the formation of discharging channels, and eventually reach ohm level. Experimental and theoretical results are compared to check if Barannik, Rompe-Weizel, Demenik, Toeple, and Vlastos formulas are applicable. The Rompe-Weizel formula is modified by changing a different constant.