The calculation of the no-load flow field in puffer arcing chamber and the experimental study

In order to investigate the effects of SF6 gas flow filed on the implementation process of circuit breaker, the software of PHOENICS is used in this article to calculate the no-load flow field in puffer arcing chamber. From the simulation, the variations of pressure, velocity and Mach number of SF6 gas in arcing chamber are derived, and the gas flow in the arcing chamber changes from subsonic to supersonic during the no-load interruption process of circuit breaker is also realized. Except the simulation, the tests of pressure measurement for actual circuit breaker are also researched in this paper to prove the correction of mathematical model. Finally, from the compare of tests and simulation results, it's found that they agree with each other well.