The Effect of Inflation Pressure on the Dielectric Recovery Strength of SF6 Circuit Breakers

SF6 gas is widely used in high-voltage power equipment due to its excellent arc extinguishing performance. During the process of breaking fault current in a circuit breaker, the thermal electrical breakdown problem in the post arc phase is significant. This article is based on a 252 kV high-voltage circuit breaker model, combined with the real gas model of SF6 gas and the valve plate motion model, and uses the thermal critical breakdown field strength (Ecr) of SF6 to study the calculation method of the recovery strength of the post arc medium. The critical breakdown field strength data under different charging pressures are simulated. The results indicate that increasing pressure Increasing pressure will lead to the decrease of Ea/Ecr, and the dielectric recovery strength will increase versus. The research results of this article are of great significance for the optimization design of high-voltage circuit breakers.