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In recent years,The electrical control new technology programmable logic controller (PLC) is rapid development,Has been widely applied in all kinds of production process and manufacturing machinery automatic control , With easy operation, simple and understandable, reliability higher characteristic, become a kind of the most popular, the most important, most applications of industrial control device for the electric power control technology, it brings new vigor and improving the efficiency of power work, but also to improve the relay protection control technology promoted a role produced, become a modern industrial automation control system in one of the important pillars.This review focuses on the relay protection technique in power system, the application of theory and examples issues the method of combining the programmable controller of relay protection control technology is analyzed, With motors and other executive appliances for control object, introduces the basic rules of the relay protection control, electric control circuit analysis and design of electric control is analyzed and studied new technology programmable logic controller (PLC) basic rule, that the structure and control principle, PLC control system design and Siemens S7-200 PLC characteristics, structure and configuration, Using PLC development of software system designed and developed series S7-200 PLC relay protection control system software, to improve the safety of the electricity system, and maintaining stability safe and reliable operation of the power system, the realization Through the finish concrete examples S7-200 control software development, for the power of the relay protection control system provides an important basis for practical applications, realized the relay protection of intelligent reasoning decision-making behavior, proof the reliability and effectiveness of the control technology, and finally achieve the operation of the power system of equipment and lines, the effective range of monitoring and control, such as failure to provide timely alarm and abnormal condition efficiently and avoid unnecessary loss, for the power system of safe, reliable, stable operation provides decision-making basis. This topic research of our country electric power protection automation research has the vital significance.
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