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.

Structural Optimization Design of Electromagnetic Repulsion Mechanism Based on BP Neural Network and NSGA‐II

“…10, it can be seen that the error between the predicted and actual values of the BP neural network model is small. The root mean square error was calculated by (1), and the RMSE value of the neural network model output value σ is 0.939 and the RMSE value of s is 0.031, and the mean square error values of both output values are small, which proves that this BP neural network model can better predict the peak stress of the repulsion disc of the electromagnetic repulsion mechanism and the repulsion disc The BP neural network model can predict the peak stress…”

“…Fast mechanical switches have now become the focus of research in DC power systems due to their fast switching speed, high voltage withstand capability, and high on‐stream flow [1]. The operating mechanism, as a key element in the fast mechanical switch, affects several of its performances, and with its relatively complex structure and the use of many components, the main failures as well as the secondary failures in the fast mechanical switch basically occur in the operating mechanism [2].…”