Research on rotary-gas high voltage SF6 circuit breaker with novel blade nozzle Part III: Arc behavior research

A 252kV single-break SF₆ circuit breaker is taken as the investigation model in this paper and 3D numerical calculation model of traditional no-blade nozzle and novel blade nozzle are presented based on 3D N-S equations. By simulating, influences of gas flow on arc during the arc extinguishing process of the two type nozzles have been researched using finite volume method (FVM). Arc extinction performance has been judged by comparison temperature, pressure and velocity vector of blade nozzle under different opening load. And the variation regular of energy is acquired by analyzing the maximum sections energy. Research indicates that blade nozzle can control gas flow movement effectively, accelerate arc energy dissipation, and benefit for the interruption of circuit breaker.