可编程控制器在进线母联自动切换操作方法上的应用

Application of Programmable Logic Controller in Automatic Switching Operation Between Incoming Cabinet and Bus Tie Breaker Cabinet

针对6kV高压变电站进线柜与母联柜传统自动切换操作中存在的不足,提出采用可编程控制器(PLC)控制技术实现自动切换的新方法。建立了变电站的仿真模型,阐述了倒闸操作的方式与内容,列举了PLC控制的I/O分配表,给出了外部接线图以及控制梯形图等。经实验测试,该方法不仅使各种操作功能更加完备,而且操作途径正确、唯一,对错误的操作能立即发出声光报警信号,而不会引起实质性的误操作结果。

Aiming at the shortcoming existing in the traditional automatic switching operation between the incoming cabinet and the bus tie breaker cabinet at 6 kV high-voltage substation, this paper proposed to adopt programmable logic controller control （PLC） technology to re-alize new ways of automatically switching, building up the simulation model of substation, expounding manners and contents of the switch-ing operation, enumerating the I/O allocation table controlled by PLC and giving the external wiring diagram and the control ladder diagram. Experimental tests show that the method not only makes all kinds of operation function more perfect, but also makes the operation procedure correct and unique, and it can immediately send light and sound alarm signals for any wrong operation, without causing substantive misop-eration results.