Simulation research of the electromagnetic characteristic of vacuum arc

摘要

Vacuum arc is the unified and balanced plasma coupled by multi-physics field, such as flow field, thermal field, electric field and magnetic field. Obviously, the electromagnetic parameters of vacuum arc, especially the high-current vacuum arc, will impact its flowing status and temperature distribution. In this paper, we studied the electromagnetic characteristic of vacuum arc based on an improved MHD model established in the previous research work. Firstly, the spatial distribution of azimuthal magnetic field strength and electromagnetic force were calculated. Then, the influence of the electromagnetic force on the flow of vacuum arc was analyzed in detail. Finally, according to the numerical results, the axial current densities of vacuum arc with different axial magnetic field were discussed. The research work contributes to optimize the external axial magnetic field to improve the breaking capacity of VCBs.