Electro-gas model breaking of capacitive currents within high voltage SF6 circuit breaker

This paper presents the modeling of coupled turbulent flow of SF6 gas and the electric field in high voltage switch gear during the interruption of capacitive currents, by using the so-called electric-gas flow model fields. Specifically, for a number of positions moving and stationary contacts during turn-off, the flow parameters of SF6 gas and the electric field between the contacts has been simultaneous calculated with finite element method. Using the calculated density of SF6 gas distribution and electric field strength at the reference conditions in the gas, one can calculate the real dielectric stress of the contacts position during switching-off of capacitive currents. During the modeling fluid flow SF6 gas applied the k-ε turbulence model and the Simplex method corrected by Chorin and Gresho.