Design and Analyses on Permanent Magnet Actuator for Mining Vacuum Circuit Breaker

A novel permanent magnet actuator (PMA) for mining vacuum circuit breaker (VCB) is presented in this paper. Which is monostable, has two coils and able to break the VCB when the fault of low-voltage happened. And can detect the voltage variation in main circuit at each instant. When the fault of low-voltage happened, it can automatically break without additional detection and control of apparatus. Moreover, the different states and parameters of breaking and closing courses have been numerical computed and analyzed by adopting ANSOFT software. Based on the simulation results, the prototype is manufactured and assembled in the mining VCB. The feasibility and validity of the proposed PMA have been proved by testing results