Design And Simulation Of Permanent Magnet Actuator For 126KV Vacuum Circuit Breaker

With the improvement of smart grid, its intelligence revolution is imperative. Permanent magnet actuator (PMA) for vacuum circuit breaker is developing rapidly and has become an important guarantee for the reliable operation of smart power system. It has important theoretical significance and engineering application value to research the core technology on the design, analysis and control of PMA, which will help to promote its application in high voltage level.This thesis designs two kinds of monostable PMAs for 126kV vacuum circuit breaker, which are with external disc spring and combined structure respectively. Their advantages and disadvantages are indicated by analyzing and comparing their characteristics with each other. After manufacturing and testing those prototypes, the experiment and simulation results are compared, which demonstrates the correctness and effectiveness the proposed design method.Firstly, the topological structure and working principle of the two PMAs are analyzed. By taking monostable PMA with external disc spring as example, the design method is briefly introduced, which provides the preliminary design of the two actuators, including structure dimensions and coil parameters.Secondly, according to the preliminary design, the magnetic field simulation models for the PMAs are established by using finite element analysis software Ansoft Maxwell. The simulation results including static and transient characteristics are. given hereafter. For a PMA having preliminary structure dimensions, this thesis proposes three methods including changing coil wire, height of armature, and model of disc spring to improve opening and closing performance of vacuum circuit breaker.Finally, an experimental platform for monostable PMA with external disc spring is built, combined with a 126kV vacuum circuit breaker, an intelligent controller, a switch mechanical properties tester and other equipment. The experimental results verify the correctness of the theoretical analysis and simulation results.