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。
This system can basically achieve many kinds of protection principles which are involved in the teaching for digital relaying protection.
该系统基本能实现微机保护教学所涉及到的多种保护原理。
This system can basically achieve many kinds of protection principles which are involved in the teaching for digital relaying protection.
该系统基本能实现微机保护教学所涉及到的多种保护原理。
应用推荐