4MV同轴-三平板型水介质自击穿开关设计

Design of 4 MV coaxial-triplate water pulse forming line switch

在1 MV水介质自击穿开关降压实验的基础上,设计了用于脉冲功率装置的水介质输出开关,设计的最高运行电压为4 MV,放电电流600 kA。4 MW水介质自击穿开关为同轴-三平板结构,由输入输出电极、预脉冲屏蔽板和连接部件组成。在结构设计中拟使用电流线圈测量每个通道的放电电流,用开关前后传输线上靠近开关端的D-dot测量开关的输入输出电压。对开关间隙进行了2维和3维静电场分析,结果发现二者差别较大,3维静电场分析应该更接近实际电场分布。

A 4 MV water pulse forming line switch that would be used in a water pulse forming line machine was designed based on the experiments of the 1 MV water self-breaking switch. The designed breakdown voltage is 4 MV with a current about 600 kA. The water self-breaking switch is made up of electrodes, a prepulse suppression plane and joint parts. The water switch is at the joint of pulse forming line and water insulated tri-plate transmission line. The gaps of the switch are arrayed at the input section of the tri-plate transmission line linearly. The discharge current of each gap will be tested by Rogowski coil while the input and output voltages of the switch by D-dot probes. Present 2 D and 3 D models of the electrostatic field analysis are useful tools forthe design. There are many differences between the results of 2 D and 3 D electrostatic field analysis. The result of the 3 D analysis is perhaps more effective because the 3 D model is more close to the configuration of the water switch.