Structure Optimization on High-Speed Electromagnetic Repulsion Mechanism

Abstract

High speed mechanical switches are gradually becoming a research hotspot in power systems, for its fast switching speed, large conduction flow and voltage-withstanding. Among them, the core design of the switches focuses on optimal design of the structure of repulsion actuator. Besides traditional factors like coil turns, capacitance, voltage, which affect the output power, the material and structure of coil frame, the enclosure of repulsion mechanism are found to be important factors in this paper. Based on finite element analysis and simulation of repulsion mechanism, a novel prototype was designed, and the simulation results were verified by experiments. Moreover, during opening process of switch, the repulsion mechanism coupled with either assistant spring or assistant opening coil in permanent magnetic actuator (PMA) are compared by experiments. The results show that the switch has smaller opening oscillation and simpler structure through using assistant opening coil. This paper has provided a better guidance for the development of high-speed repulsion mechanism in interrupters.