使用两个反并联的可控硅控制三相角接的电力电容器,使用过零触发模块,当系统中欠补(系统中感性无功大于容性无功)时,该模块接受触发命令后,能自动捕捉可控硅两端电压,当电压为2V~6V时,触发可控硅,使可控硅导通投入电容器.产生的涌流仅为电容器额定电流的1.5~1.7倍,可控硅式电容柜由于控制了其导通时两端的电压,所以很好地控制了涌流.

由于是两个反并联的可控硅组成可控硅模块,一个可控硅在电压波形的上半周导通,另一个在下半周导通.当系统中过补(系统中容性无功大于感性无功)时,过零触发模块接收不到触发命令,可控硅会自然关断,而且速度快.由于不存在触点,无电弧重燃现象,电网电压与电容器端电压产生不了迭加,从而很好地控制了过电压.

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