水介质自击穿开关放电参数测试

 在“闪光-Ⅱ”装置上进行了1 MV同轴型水介质多针自击穿开关实验研究。开关击穿电压1～1.5 MV，开关总电流200～550 kA，电脉冲的脉宽约150 ns，上升前沿约60 ns。每个开关间隙的放电电流和输入输出电压分别用Rogowski线圈和CuSO4水电阻分压器测试。介绍了分压器的设计和标定，分析了产生误差的原因。针对类似测试，提出几点完善措施：测试电流线圈要密封隔水；水电阻分压器的第1级分压的分压比不能过大；调节CuSO4溶液的浓度，使水电阻的阻值满足频率响应的要求；注意分压器的放置方式；分压器和电流线圈的输出电压设计要适中。

Discharge parameters test of water self-breaking switch

A low-prepulse and high-power water dielectric self-breaking switch was investigated on Flash Ⅱ generator, whose breakdown voltage was from 1.0 to 1.5 MV and discharge current was from 200 to 550 kA. The rise time of the discharge current was about 60 ns and pulse duration(FWHM) was 150 ns. The discharge current of each gap was measured by Rogowski coil and the input voltage and the output voltage were measured by CuSO4 resistance divider. The calculation result was compared with the demarcation results of divider ratio and the reason of producing error was analyzed. Some pieces of advice about experiment were presented: (1)Rogowski coil must be separated from water. (2)The divider ratio of the first stage of the CuSO4 resistance divider should not be too great. (3)The concentration of Cu