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.
与继电器配合，可对系统和设备进行过电流、过负荷和接地等保护。
Cooperating with relay, it can protect system and equipment from excess current, overload, and earthing etc.
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