Study on electromagnetic force interaction and influencing factors of fast repulsion mechanism of vacuum circuit breaker

The fast repulsion mechanism has become one of the feasible schemes for the opening and closing operation of DC vacuum circuit breaker due to its fast-moving and controllable output characteristics. In this paper, considering the influence of material characteristics and structural changes of the repulsion disc, the motion process and electromagnetic force output changes of the mechanism are quantitatively analyzed. Using finite element numerical simulation method, a coupled physical mathematical model of electromagnetic force was established, the mechanical motion characteristics were solved, and the influence of the material and structure changes of the repulsion disc on the characteristics of the operating mechanism was studied. The results show that changing the material and mechanical structure of the repulsion disc can effectively improve its motion characteristics and stress distribution, and the composite hole structure of the repulsion disc can ensure the mechanical strength of the repulsion disc and the rapid reliability of the mechanism.