543 / 2017-05-13 16:45:35

Effects of N2 contents on the non-equilibrium composition in SF6 decaying process

14117,14118,14119

It’s increasing clear that departures from both thermal and chemical equilibrium exist in conditions relevant to high-voltage circuit breakers after current zero. The electron temperature (Te) is often higher than the heavy species temperature (Th). We are intended to investigate the effects of N2 contents on the electron temperature and non-equilibrium composition during the arc decaying process, when the heavy species temperature decreases from 12000K to 1000K at 4 atm. A two-temperature chemical kinetic model of SF6/N2 thermal plasma containing all the reactions available is developed. The ratio of Te to Th is defined as the function of electron number density. And also, T* is introduced to allow a smooth transition between Te and Th. The ratio of Te to Th and the kinetic compositions at different N2 contents are compared and analyzed. Then, the physicochemical process can be better interpreted based on the non-equilibrium phenomenon.