Vacuum Dielectric Recovery Characteristics of a Novel Current Limiting Circuit Breaker Base on Artificial Current Zero

In order to maintain the reliability of the opening operation of a new vacuum DC current limiting circuit breaker in cutting off short circuit current,the vacuum dielectric recovery after current zero was investigated.An equivalent experiment was designed and set up.Dynamic vacuum dielectric recovery characteristic of the circuit breaker during opening of the vacuum contacts was achieved from experiments results and theoretical deduction.Researching results show that the breakdown voltage of the vacuum interrupter can be improved with less arcing energy and higher contact moving speed;and with the increasing of arcing time the breakdown voltage reduces at first and increases later.These results can be used in the designing of the new vacuum DC circuit breaker.