This paper introduces the application of PLC in reconstructing the relay control system and gives I/O distribution diagram and some of programs.
介绍了PLC在继电器控制系统改造中的应用，给出了I/O分配图及部分程序。
This paper discussed the reliability problems of relay protection of a station transformer distribution system and expounded the form of the distribution system and with relation to its calculations.
讨论了厂用变压器配电系统继电保护的可靠性问题，论述了配电系统的组成和与其相关的各种计算。
In order to ensure municipal power distribution system 'normal operation, the protection equipment of relay protection should be correctly set.
为了确保城市电网配电系统的正常运行，必须正确地设置继电保护装置。
Main duties of relay protection are correctly and quickly judging and clearing system faults, which greatly derive voltage sags in a distribution system.
系统中大部分电压跌落由故障引起，快速可靠地判断并切除故障是继电保护的主要职责。
Main duties of relay protection are correctly and quickly judging and clearing system faults, which greatly derive voltage sags in a distribution system.
系统中大部分电压跌落由故障引起，快速可靠地判断并切除故障是继电保护的主要职责。
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