Abstract
Hybrid circuit breaker, consisting of a vacuum interrupter and an SF 6 interrupter connected in series, which takes the place of SF 6 circuit breaker, is a kind of high-voltage big-capacity circuit breaker for Low-carbon technology research area. The experimental model of fiber-controlled hybrid circuit breaker with a vacuum circuit breaker and an SF 6 circuit breaker in series was set up, and the fault current interruption experiment was conducted on two circuit breakers in different collaborative action moments. The voltage distribution between the vacuum circuit breaker and SF 6 circuit breaker was analyzed, the characteristics and interactions between vacuum arc and SF 6 arc were studied during the interruption process. The experimental results indicate that the vacuum circuit breaker makes up the shortage of low dielectric recovery speed of SF 6 interrupter in the initial period of dielectric strength recovery, whereas the SF 6 circuit breaker takes the advantage of high voltage endurance of SF 6 and withstands larger parts of the transient recovery voltage in the peak period of dielectric recovery voltage. The breaking capacity of hybrid circuit breaker is bigger than SF 6 circuit breaker.
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