采用具有选择性的过电流方向继电器，对这种相互分隔直流系统的保护相对就简单。

Protection for these isolated systems has been a relatively simple task, which is carried out using over current directional relays with selectivity.

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对于后备保护装置防止高阻抗接地故障，将配置一只双极方向过电流继电器，同瞬时跳闸附件的时间成反比。

For backup protection against high resistive ground faults, there will be a dual polarized directional overcurrent relay, inverse time with instantaneous trip attachment.

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逆功率继电器逆功率继电器是指带瓦特计的继电器，用来感知电流的方向。

Reverse power relay a reverse power relay is a relay with a wattmeter movement that senses the direction of power flow.

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