Because of the advantages of simple structure

quick action

high reliability

easy realization of electronic control and intelligent switch

high speed vacuum switch based on permanent magnetic repulsion mechanism has attracted the attention of scholars both at home and abroad. In order to improve the speed of permanent magnetic repulsion mechanism and to provide technical support for the high speed vacuum switch

this paper studies the influence factors of permanent magnetic repulsion mechanism by using the finite element method. After the simplified model of permanent magnetic repulsion mechanism is built by Maxwell

the opening operation performance is simulated by different masses of moving partand size of metal repulsion plate

different parameters of external circuit by the single variable method. A prototype of 12 kV high speed vacuum switch is made according to the simulation results. Simulation result appears the lower mass of moving part and the higher voltage of charging capacity lead to higher speed of mechanism. The experimental results agree well with the simulation and it shows that the switch can open in 5 ms reliability

and the disposability of opening operation is less than ±0.2 ms. In the meantime

in order to improve the opening velocity of the switch

a new method is proposed that is punching in the metal plate to reduce the mass of moving parts. Because punch holes are along radial direction

eddy current effect cannot be affected. It is also verified by the experimental results.