研制了水介质同轴电容的实验装置,在此装置上进行了大量的实验.测得μs级充电时,水介质同轴电容分别在正脉冲和负脉冲充电时的击穿电压,负击穿电压的理论值与测量值相差较大,正击穿电压的理论值大于测量值的18%左右,对此实验结果进行了分析.此外,当去离子水的电阻率从13MΩ*cm降到5 MΩ*cm时,水介质同轴电容器的击穿电压基本不变.

The experimental apparatus of coaxial water capacitor was set up in microsecond charging condition. Some experiments were done in this device, the voltage of breakdown of coaxial capacitor is measured with positive and negative pulse voltage to charge. Comparing the experimental results with the calculating results, the error of the negative breakdownvoltage is larger and the error of positive breakdownvoltage is less than about 20%. Furthermore, when the resistivity of the water drop to 5MΩ·cm from 13MΩ·cm, the breakdownvoltage of the coaxial water capacitor did not change approximately. The results of experiment are analyzed and are important in design of water dielectric Blumlein pulse forming line with microsecond charging.