The backup relaying system will have first, second, and third zone directional distance relays for protection against phase and ground faults.
后备继电系统将设置第一、第二与第三区方向距离继电器，以防相位故障与接地故障。
It effectively avoids the action failure of the primary protection zones related to the measuring point which loses information, as well as the improper action of the backup protection zone.
这将有效地避免信息缺失测量点相关的主保护区拒动，从而后备保护区动作使其所包含的多个主保护区全部停电的情况。
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