This paper introduces a kind of electric circuit which mainly consists of a peak detector and a pulse-width discriminator for protecting the three-phase alternating-current supply with loses a phase.

介绍了一个主要由峰值检波器和脉冲宽度鉴别器构成的三相交流电源缺相保护电路。

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Primary electrical power is provided by two engine driven generators which supply three-phase, 115 volt 400 cycle alternating current.

主电力是由两个发动机驱动发电机供应三相，115伏400周期交流电。

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The modified types will not be equipped with commutation transformer and the three-phase alternating current power supply directly acquires DC voltage through bridge type rectifier.

改进型不配整流变压器，将三相交流电源直接由桥式整流获得直流电压。

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