Contribution of Opening Speed for Reduction of Hight Temperrature Region in a Double-Flow Circuit Breaker is Investigated Using Three-Dimensional Electromagnetic Thermol Fluid Simulasion

Gas circuit breakers have a problem of thermal reignition. Therefore, to reduce the size of the arc quenching chamber while preventing thermal reignition and ensuring a reliable circuit breaker is need 1 . Therefore, to clarify the current interruption phenomenon under considering the cooling of the arc is needed. However, it is difficult to understand high-temperature arcs with experiments, so numerical analysis using simulations is being carried out in parallel 2 4 . In most of the simulations of circuit breakers, the arcs generated in a state where the interelectrode distance is constant and the poles are already open on the order of several centimeters have been analyzed. However, in an actual circuit breaker, the electrodes open with time, and the temperature volume of the arc also increases with time. In order to simulate such an opening behavior, it is difficult to handle the boundary between the electrode and the gas interface, where the physical quantity changes rapidly with time. In this research, the contribution of the opening speed for the reduction of the high temperature region in a double-flow circuit breaker is investigated using a three-dimensional electromagnetic thermo-fluid simulation.