Abstract:

During the vacuum arc breaking process,a large number of particle streams flow toward the anode at a higher bombardment speed,causing concentration of current density on the anode surface,and the anode to heat up.In this paper,a model of anode ablation in the vacuum arcing process with the contact rotating is established,and the deformation,ablation,residual volume and the corresponding temperature distribution changes of the vacuum arc on the anode surface are studied.The temperature distribution and ablation residual volume under the conditions that the contact does not rotate and the contact rotates are compared.The results show that the maximum temperature of anode surface is low and the ablation residual volume is large in the arcing process when the contact rotates.The greater the rotation speed,the lighter the ablation effect of the vacuum arc on the anode.

Key words: vacuum circuit breaker, vacuum arc, spin, anode, erosion