“…Equation 1and (2) are the motion equations of the plunger of the actuator and the moving contact of the vacuum interruper and equation 3is the equation of the operating circuit for the actuator, where m A and m C are mass of the plunger of the actuator and the moving contact of the vacuum interrupter, respectively. F emf is the electromagnetic force generated by the actuator and F WIPE is the wipe spring force, F fric and F fric2 are the friction force in the actuator and the interrupter, respectively.…”