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。

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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。

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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。

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