Study on Coupling Mechanism of Multi-physical Field Simulation for Low Current Vacuum Arc
The vacuum arc generated during the breaking process of a vacuum switch involves multiple physical field couplings such as electricity,magnetism,and heat,as well as changes in multiple physical parameters.It is crucial studying the characteristics of the vacuum arc for improving vacuum circuit breakers.This study establishes a small current vacuum arc multi-physics field coupling model,using COMSOL Multiphysics to simulate key parameters such as temperature,pressure,velocity,current density,magnetic field intensity,etc.during the combustion process,and analyzes the coupling mechanism between multi-physics fields.The results show that the maximum plasma temperature,pressure,and current density are all located at the center of the cathode surface,the maximum magnetic field is near the cathode side,and the maximum velocity is near the anode side.The fluctuation trends of temperature field,current density field,and magnetic field over time are basically consistent,while the fluctuation of velocity field lags behind that of pressure field.
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