气体火花间隙开关通道电阻及热效应特性研究

Research on channel resistance and thermal effect characteristics of gas-filled spark gap switch

针对一种应用于高功率重复频率Marx型脉冲功率源的两电极火花间隙气体开关,开展了火花通道电阻及其热效应特性研究,分析了火花间隙通道电阻热效应的影响因素,研究了重复频率连续工作条件下开关腔体内温度及气压变化。研究结果表明,开关腔体内气压和温度随着工作时间增长呈现先快速增加然后缓慢增长趋于稳定的趋势,脉冲电流幅值的增长对热量沉积的增加效果非常明显。研制的两电极火花间隙开关,在导通峰值电流14.7 kA、脉冲宽度160 ns的条件下连续运行9000个脉冲时,开关通道产生热量约36.6 kJ,在电流导通时间内,通过焦耳热效应计算得到开关导通时间内火花通道电阻平均值约0.12Ω。

A study was conducted on the spark channel resistance and thermal effect characteristics of a twoelectrode gas-filled spark gap switch applied to a high-power repetition-rate Marx-type pulse power source.The influencing factors of the thermal effect of the spark gap channel resistance were analyzed,and the temperature and pressure changes inside the switch chamber under continuous repetition-rate working conditions were studied.The research results indicate that the pressure and temperature inside the switch chamber show a trend of rapid increase followed by slow increase and stabilization with the increase of working time.The increase of pulse current has a significant effect on the increase of heat deposition.Using the two-electrode spark gap switch developed in this article,9000 pulses were continuously operated under the conditions of peak conduction current of 14.7 kA and pulse width of 160 ns,and the discharge channel of the switch generated about 36.6 kJ of heat.During the current conduction time,the average resistance of the spark channel was calculated to be about 0.12Ωthrough Joule heating effect.