Mathematical modeling of SF/sub 6/ puffer circuit breakers. II. Current zero region

For pt.I see ibid., vol.24, p.490 (1996). A mathematical model of arc behavior in an SF/sub 6/ puffer gas-blast circuit breaker in the high current phase was reported in a previous paper. This model is extended to the current zero region by solving the full partial differential are conservation equations taking account of both turbulent and radiation effects. The critical RRRV for the breaker can therefore be calculated based on the whole arcing history. The predicted values are compared with the experimental results of Noeske et al. (1983), and good agreement is found providing that the free parameter in the turbulence model is set appropriately. Results for temperature, electric field, and velocity are also presented and analyzed.