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为了减小脉冲功率源装置的体积,对三电极气体开关和两电极气体开关的结构进行了小型化设计。采用电磁场仿真软件对局部结构进行优化,对初步设计的触发开关和自击穿开关在不同SF6气压(0~0.2MPa)、不同开关间隙条件下的击穿电压及触发工作电压等进行了实验研究。结果表明:设计的触发开关和自击穿开关在0~0.2 MPa气压范围内,自击穿电压随气压具有很好的线性关系;自击穿开关间隙为8 mm,改变气压(0.1~0.2 MPa)可实现自击穿电压90~125 k V可调;触发开关主间隙为7 mm,改变气压(0.1~0.2 MPa)可实现触发工作电压40~95 k V可调;初步估算,触发开关和自击穿开关的工作电感均约20 n H。利用重频脉冲电源,测试了开关的重频工作能力,在工作电压80 k V、导通电流约20 k A的条件下,重复工作频率在20 Hz以上。此外,利用研制的开关构建了八级紧凑型Marx发生器,实现了5和10 Hz重频多脉冲输出。
In order to reduce the size of the pulsed power source device, the structure of the three-electrode gas switch and the two-electrode gas switch has been miniaturized. The local structure was optimized by electromagnetic field simulation software. The breakdown voltage and triggering voltage of the initial design trigger switch and self-breakdown switch under different SF6 gas pressure (0 ~ 0.2MPa) and different switching gap were studied. . The results show that the self-breakdown voltage has a good linear relationship with the air pressure in the pressure range of 0 ~ 0.2 MPa. The self-breakdown switch has a clearance of 8 mm and a pressure of 0.1-0.2 MPa ) Can be self-breakdown voltage 90 ~ 125 kV adjustable; trigger switch main clearance of 7 mm, change the pressure (0.1 ~ 0.2 MPa) can trigger the work voltage 40 ~ 95 kV adjustable; preliminary estimates, the trigger switch and Self-breakdown switch operating inductance is about 20 nH. The re-frequency pulse power was used to test the re-frequency capability of the switch. Under the condition of the operating voltage of 80 kV and the on-current of about 20 kA, the repetitive operating frequency was above 20 Hz. In addition, an eight-level compact Marx generator was constructed by using the developed switches, which achieved 5 and 10 Hz multi-pulse output with multiple frequency.