Analysis and solustion of the anti-tripping circuit on 10kV circuit breakers

LI Ying-cheng, CHAI Long-qing, GAO Zhen-xing, WANG Zhen-ning, WANG Hong-guang

(State Grid Yantai Power Supply Company, Yantai 264000, China)

Abstract: Aiming at the problem that the circuit breaker can not switch on again, and a phenomenon that tripping and closing monitoring lights along with bright when we did the replacing and debugging test of 10 kV line protection devices in a Shandong 110kV transformer substation. After analyzing operating circuit of protection device and the secondary circuit of the switching mechanism, anti-tripping of NARIRELAYS RCS-9611C protection devices and Anti-jump switching mechanism of Qingdao Yi He was used simultaneously at the scene. A parasitic circuit was produced. A measure was proposed by accessing normally closed contact of the breaker and switch mechanism′s antitripping relay in closing monitoring circuit. Breaker was tested repeatedly using the opportunities of power failure and switch in the test position. The results show that the program is not only the perfect solution to the problem, while the quality of closing the circuit has been monitored.

Key words: anti-tripping circuit; closing monitoring circuit; protection anti-tripping; mechanical anti-tripping