永磁机构真空断路器的动态特性仿真及分闸弹跳分析(英文)

In order to research the dynamic characteristics of circuit breaker(CB) in opening process,taking a 12kV vacuum circuit breaker(VCB) with permanent magnetic actuator as the example,a dynamic model of the VCB is established based on the virtual prototype technology,and dynamic equations of the model are deduced.Simulation and experiment are carried out on the VCB of both opening and closing processes.The simulative opening time and closing time are 39.5ms and 54.6ms respectively.Influencing factors of opening bouncing and their effect principles are analyzed through dynamic simulations of opening bouncing process.Analytic results indicate that the increase in the stiffness coefficient of contact spring limits the opening bouncing;meanwhile increases in the preload of contact spring and the mass of shaft can enlarge the opening bouncing.