Performance analysis of high voltage SF6 circuit breaker based on coupling computation of electric-gas flow field

To study the insulation performance and the dielectric recovery characteristics based on the interaction of electric field and gas flow field in high voltage circuit breakers (HV CBs), a two-dimensional coupling physical-mathematical model has been developed. And the influence of shock wave and turbulent flow has been taken into consideration. To realize the dynamic simulation of the coupling field under no load breaking, the automatic generation approach of self-adaptive meshing grid of the electric field computation and slippage meshing grid of the gas flow field computation has been proposed and applied. Moreover, the electric field is numerically computed using finite element method (FEM), and the N - S equation and K - epsiv equation of flow field have been solved using the combination of improved total variation diminish scheme (TVD) with finite volume method (FVM), and the implement course has been described. Meanwhile, the numerical experiment of the interrupting course of CB has been performed and discussed.