Influence of Arc Energy to Puffer Pressure Rise for SF6 Circuit Breaker

Due to the principle of extinguishing for SF6 high voltage circuit breaker, the throat will be clogged, and the arc energy will be transferred into the puffer chamber to increase the puffer pressure. That makes the arc energy play an important part in pressure character. Based on the first law of thermodynamics, the law of hydrokinetics and the second law of Newton, the mathematic model of pressure character of SF6 high voltage circuit breaker was built. Applying this method associating T100s test duty the gas pressure characters of the 252kV SF6 circuit breaker were calculated, the pressure build process were obtained and the influences of interrupted arc on gas pressure character, by comparing with the experimental result, the theoretical model can be modified and recalculated. And the influence of throat structural parameters to the characteristic of pressure was analyzed.