文章分析了有关继电保护后备保护的问题，认为必须完善后备保护，只有这样，才能保证电网和设备的安全。
The paper analyses about reserve protection's problem of relay protection, it must perfect reserve protection, only in this way, to assure electric wire netting and equipment's safe.
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。
Each 500 kV transmission line will be protected by two primary pilot relaying systems with a backup relaying to achieve primary and secondary protection.
应用推荐