Fast-Acting Mechanical Switch and Its Operating Method

A fast mechanical switch, comprising:

• a closed housing;
• a vacuum interrupter, wherein the vacuum interrupter is provided with a stationary fixed contact and a moving contact being capable of slidingly engage therewith, wherein the fixed contact is connected to a first busbar projecting out of the housing and the moving contact is connected to a second busbar projecting out of the housing;
• an electromagnetic repulsion mechanism located below the vacuum interrupter, which is fixedly connected to the vacuum interrupter via a transmission rod, wherein the electromagnetic repulsion mechanism comprises:
• a first repulsion unit electrically connected to the first electrical terminal, comprising a first repulsion disk which is fixed and a second repulsion disk which is located below thereof and separated therefrom, wherein the second repulsion disk is fixedly connected to the transmission rod via a drive rod passing through the first repulsion disk to drive the vacuum interrupter to open or close;
• a second repulsion unit electrically connected to a second electrical terminal independent of the first electrical terminal, comprising a third repulsion disk disposed below and spaced apart from the second repulsion disk, wherein the second electrical terminal is configured to operatively control the current supplied to the third repulsion disk in response to the first repulsion unit such that the third repulsion disk applies a resistance to the second repulsion disk when the second repulsion disk is moved downwardly for opening and applies a thrust to the second repulsion disk when it is moved upwardly for closing.