A multi-physics field coupling model is established to optimize vacuum circuit breakers,consider-ing the physical properties of copper vapor in a vacuum arc.The behavior of arc characteristics in vacuum cir-cuit breakers is qualitatively and quantitatively studied by combining simulation and experiment research.COMSOL multi-physics simulation is used to analyze key parameters such as temperature,pressure,velocity,current density,magnetic field strength and the mechanism of multi-physics field coupling during the arc com-bustion process.The results show that the parameters such as plasma temperature,pressure and current densi-ty are distributed in an inverted cone shape.The cathode surface temperature is always higher than the anode surface temperature,and the diameter of the anode surface current density distribution is significantly larger than that of the cathode surface current density distribution.The axial velocity of plasma follows a spindle-shaped distribution,while the radial velocity follows a normal trapezoidal distribution with significant axial and radial velocity gradients.The magnetic field intensity is distributed in a circular pattern.After Combination with the dynamic observation experiment of the microflow field,the simulation results are consistent with the arc photos.Compared with the traditional magnetic fluid simulation model,this model has a self-generated arc shape and rich contour details.
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