针对主电极间距20 mm以上的沿面击穿型多棒极触发真空开关(TVS),研制了开关触发源。触发源利用脉冲变压器产生脉冲高压输出,在脉冲变压器高压侧并联小容值电容并在电容后串联陡化间隙。陡化间隙的加入可以使触发源输出不受触发沿面金属蒸气沉积的影响。通过调节间隙击穿电压也可以提高电容充电电压及储存能量,从而增加TVS触发沿面被击穿时注入到其中的触发能量。使用该触发源对TVS进行导通实验,结果表明,加入陡化间隙后的触发源输出能量大幅提高且不受触发沿面金属蒸气沉积的影响,能够实现TVS的100%可靠导通。

A trigger circuit was developed for triggered vacuum switch (TVS) with more than 20 mm gap distance. The trigger circuit generate a high pulse voltage by pulse transformer, parallel a small capacitor on the output of the transformer and series a sharpening gap between the capacitor and the trigger surface. The output of trigger circuit is not affected by metal vapor deposition on trigger surface. Adjusting the gap breakdown voltage can increase charging voltage and energy storage of capacitor. Conduction tests for TVS were done with the trigger circuit. The results show that output energy of the trigger circuit was increased by adding the sharpening gap, regardless of the metal deposition on trigger surface. The trigger circuit can ensure 100% reliable conduction of TVS with a series sharpening gap between the capacitor and the trigger surface.