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