... backup reactor shutdown capability 后备停堆能力 backup relaying 后备继电保护 backup ring 垫圈 ...
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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。
Each 500 kV transmission line will be protected by two primary pilot relaying systems with a backup relaying to achieve primary and secondary protection.
由两个主控制继电保护系统对各条500千伏传输线进行保护，该控制继电保护系统上装有一只后备继电器，以实现初级保护与二次保护。
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