Study Of SCM-controlled Emergency Disposal Device After Substation D.C. Disappeared

In our country, relay protection equipment of electric power system plays positively role on the safety in power production. But relay protection equipment will cease to be effective when direct current (D.C.) of relay protection disappeared and the accident of electric short circuit occurred.In this paper, a sort of SCM(Single Chip Micprocessor)-controlled emergency disposal device had been presented, which was used to achieve safety in production when direct current (D.C.) of relay protection disappeared. Integral design scheme had been advanced, including hardware structure and software program. The using ranges and work principles of this device had been analyzed. Also, combining it's using limits, cooperating role with the other devices and using reliability had been analyzed. The result showed that this device was helpful complementarities to relay protection equipment, and was beneficial to the reliability of power supply. It can fully be applied to mutiple-automatization substation and the improved nobody on watch substation equipped with RTU. It has been indicated that this device possesses expansive applicable foreground.