Abstract:

In order to coordinate the contradiction between the speed and service life of the fast vacuum switch,an operation method combining a magnetic repulsion mechanism and a permanent magnet operating mechanism is adopted,spring driving is adopted between the electromagnetic repulsion mechanism and the permanent magnet operating mechanism,which can reduce the mass of the moving part,thereby reducing the opening time.Aiming at the phenomenon that the movable contact is driven to quickly open in place and then rebounds to the closed position,the magnetic field generated by the eddy current and the closing coil circulating current will weaken the magnetic field of the permanent magnet,which will have a greater impact on the motion characteristics of the electromagnetic repulsion mechanism.Three kinds of improvement measures are proposed,and the effectiveness of the measures and the feasibility of practical application are verified by experiments.

Key words: fast vacuum switch, electromagnetic repulsion mechanism, permanent magnetic actuator, eddy current