A Research on Dielectric Characteristics of Small Current Interruption Considering Pre-Condition Test for Puffer Type Circuit Breaker

Pre-Condition 시험을 고려한 Puffer식 차단기의 진상소전류 차단성능에 관한 연구

This paper presents the small current interruption capability of $SF_6$ puffer circuit breaker considering pre-condition. Firstly, the change of dielectric strength of the 3 breakers was compared with testing breakers as clean contacts and eroded contacts after 3 shots of 760 according to new IEC 62271-100 standard. Also the dielectric strength curve of each model was calculated through flow and electric field simulations. From these results, we could modify the empirical equation, being used to predict the dielectric strength of small current interruption capability, considering the effects of pre-condition.