两电极气体火花开关触发系统
Trigger system of two-electrode gas spark switch
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摘要: 两电极开关取消了触发电极，需要靠过压触发，要求触发电压的幅值高，上升前沿快。为了满足两电极大电流气体开关对触发电压的特殊要求，介绍了一种用Marx作触发器的触发系统。该系统由8级Marx发生器构成，由电源开关、隔离变压器、L-C充电电路、采样控制电路、光纤控制电路和触发电路组成。Marx发生器采用了低电感电容器和同轴结构布局，减小了电感，触发电压达到120 kV，上升沿小于30 ns。对触发系统建立了PSpice电路模拟，仿真波形与实测波形基本一致。将该触发装置用于200 kA大电流气体开关试验，试验结果表明该触发装置能稳定触发气体开关，操作安全可靠。Abstract: The two-electrode switch has no trigger electrode and longer life than the three-electrode switch. In order to trigger the switch, the trigger voltage’s peak-to-peak value should be very high and the rise time of trigger pulse should be short. This paper introduces a kind of trigger system which uses a 8-step Marx generator. The trigger system includes the Marx generator, power switch, insulating transformer, L-C charging circuit, sampling control circuit, optical fiber control circuit and triggering circuit. In order to reduce the inductance of Marx generator discharge circuit, the Marx generator uses low-inductance capacitors and coaxial structure. The trigger voltage is 120 kV, and the rise time is less than 30 ns. The simulation mode of the Marx generator discharge circuit is establi
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