Dynamic simulation and closing bouncing analysis on the 12kV vacuum circuit breaker with permanent magnetic actuator

For researching dynamic characteristics of circuit breakers(CB), aiming at a 12kV vacuum circuit breaker(VCB) with permanent magnetic actuator, the dynamic model of the vacuum circuit breaker is built based on virtual prototype technology. According to D´ Alemhert´s movement equations and Maxwell electromagnetic equations, the simulation is made on the vacuum circuit breaker in opening and closing dynamic processes. The experimental system is designed in order to verify simulation results. The opening time and the closing time of simulative model are 40.3ms and 55.2ms, simulative results are in accord with experimental data. Influencing factors of the closing bouncing and action principles of these factors are analyzed by dynamic simulation on the closing bouncing process. Analytic results indicate that increasing the preload and the stiffness coefficient of contact spring can limit the closing bouncing.