低预脉冲水介质多通道自击穿开关实验研究
Investigation of a low prepulse multi-channel self-breaking water switch
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摘要: 在“闪光Ⅱ”上进行了水介质多针自击穿开关实验研究。开关由2个或4个开关间隙、预脉冲屏蔽板及其支撑结构组成。介绍了开关结构及其集中参数等效电路模型，并给出了部分参数计算方法。开关间隙在约60 ns时间内被近似线性地充电至约1 MV，开关的放电电流、输入和输出电压分别用罗果夫斯基线圈和硫酸铜水电阻分压器测试。进行了2个间隙结构和4个间隙结构开关实验，开关的放电电流200～550 kA，平均击穿场强600～900 kV/cm。开关间隙抖动小于4 ns，开关间隙的击穿迟滞时间约为60 ns，2个间隙结构开关的间隙之间的击穿同步性能可以优于3 ns，4个间隙结构开关的间隙之间的击穿同步性能可以优于5 ns。预脉冲被有效地压缩，输出电压的预脉冲幅值约为输入电压预脉冲幅值的50%，从180 kV压缩至约90 kV，作用时间由600 ns压缩至60 ns。Abstract: A low prepulse high power density water dielectric self-breaking switch has been investigated on FlashⅡgenerator recently. The switch contains two or four gaps, a prepulse shield and supporting hardware. The configuration and equivalent circuit model of the switch are introduced while part parameter calculations are provided in this paper. All gaps of the switch were charged approximately linearly from 0 to 1 MV in 60 ns. The discharge current and the input or output voltages of each gap were measured by a Rogowski coil and CuSO4 resistance dividers respectively. The switches with two gaps and four gaps were experimented respectively. The water switch was discharged with a discharge current about 200 to 550 kA after the gaps were charged and had a mean field of 600 to 900 kV/cm. The jitte
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Key words:
- water dielectric /
- self-breaking /
- multi-channel switch /
- prepulse
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