PLC在输电线路自动重合闸控制中的应用

Application of PLC in automatic reclosing control of transmission lines

为提高三相自动重合闸控制系统的工作效率和工作可靠性,利用PLC软件代替硬件的方法对自动重合闸装置进行改造。在PLC的软件控制中,首次使用上升沿微分指令DIFU和下降沿微分指令DIFD,在控制中指令分别只对信号的上升沿和下降沿有效,保证了控制的精确度,减少了误动作,该两条指令恰当使用也是该文的创新点所在。从实践结果来看,利用PLC构成自动重合闸装置的控制系统运行速度快、故障少、工作稳定,且体积小、成本低,值得在工业领域推广使用。

To improve the working efficiency and reliability of three-phase automatic reclosing control system,the automatic reclosing device was modified by the method of using PLC software instead of hardware. The DIFU instruction and DIFD instruction are used first in software control of PLC. The control instructions are valid only to the rising edge and falling edge of the signal respectively,which can ensure the control accuracy and reduce the misoperation. The appropriate application of two instructions is the innovation point of this article. The practice results show that the PLC-based control system of automatic reclosing device has fast speed running,less failure,stable operation,small size and low cost. It is worth promoting and using in industrial field.