Dynamic analysis and parametric design of mechanical characteristic for 126kV vacuum circuit breaker

Motor actuator make circuit breaker open or closed by the force or torque produced from the motor, it equips with braking keep device, make the circuit breaker in the open or close position. It has many advantages: simple structure, little cubage, quick response and the motion proceeds are controlled, and it has been paid more and more attention. The virtual prototype technology is used to design vacuum circuit breaker in this paper, and the virtual prototype model is established by using ADAMS (Automatic Dynamic Analysis of Mechanical Systems) aiming at the dynamic problem of 126kV vacuum circuit breaker with motor actuator, the dynamic characteristics of circuit breaker are simulated, the simulation results show that the motor actuator meet opening-closing operating requirements. Parametric design is used in the vacuum circuit breaker virtual prototype model, the harm of the contact bounce and the influence factors of contact bounce are analyzed, and some measures to reduce the contact bounce are put forward; the mass of the transmission mechanism and the parameters of contact spring which influence the moving characteristics of vacuum circuit breaker are analyzed, the design variables which have bigger influence on moving characteristics are selected to increase the average closing speed and just-open speed to improve the circuit breaker.