Study on the Influence of Key Component on the Fast Vacuum Switch

The fast vacuum switch can reach a high open velocity. It is a key part of the mechanical high voltage direct current circuit breaker. The fast vacuum switch is mainly driven by the current flowing repulsive coil. Now many researchers focused on the optical designed of the repulsive mechanism. Some common faults on the key component, including the repulsive coil, the repulsive disk and the bistable spring, were seldom discussed. In order to get a better understanding of the common fault, this paper carried out simulations about the aging of repulsive coil and bistable spring, the deformation of repulsive disk. The simulation results indicated that the aging of repulsive coil and bistable spring showed small effects on the motion of the fast vacuum switch. The deformation of repulsive disk showed obvious effect on the opening process.