这样每半周的回路是完整的，一半的初级在屏极线路上，另一半在阴极线路上。

This still enabled each half cycle to complete its loop through the one-half of primary in the plate circuit and one-half in the cathode circuit.

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用于低压交流回路的断 路器，由于在过零换向电压不能满足再次阴极放电起弧的需要，因此具有容易灭 弧的优点。

In breakers for operation in low-voltage ac circuits, advantage is taken of the voltage required to establish a cathode spot.

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用于中压交流回路中的断路器，利用阴极辉点现象的方法和拉长电弧去游离的方法相结合。

In breakers for medium-voltage ac circuits, the cathode-spot phenomena may be combined with methods for bringing about the lengthening and deionization of the arc path.

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