Study on Dynamic Arc Model for High Voltage Hybrid Circuit Breaker using Vacuum Interrupter and SF6 Interrupter in Series

Hybrid circuit breaker, consisting of a vacuum interrupter and an SF6 interrupter in series, which take the place of single SF6 circuit breaker, is a research area to low-carbon technology for high-voltage switch. In this paper, the model simulation system of hybrid circuit breaker was established by Alternative Transients Program. The system simulation model establishment mainly includes building the electromagnetic transient simulation platform, setting system circuit parameter, improving SF6 arc model and vacuum arc model, whose parameters were obtained by program calculating. The aim of this paper was to investigate the interactions of vacuum arc and SF6 arc during the breaking process, the voltage distribution of the two breakers, the gain characteristics of the coordination action between two breakers by simulation. The results of simulation showed that vacuum interrupter cooperates with SF6 interrupter well in the current zero period, and a higher breaking capacity can be obtained. The results of simulation were in accordance with the theoretical prediction and prove the validity of theoretical model very well.