新型强迫换流型限流断路器真空介质强度的恢复特性

为了保证新型强迫换流型真空直流限流断路器关断短路电流的可靠性,对该型断路器分断过程的真空介质恢复特性进行研究。设计了与断路器关断过程等效的介质恢复试验方案,通过等效试验结果和理论推演公式的拟合,得到了新型强迫换流型限流断路器真空灭弧室触头打开过程的动态介质强度恢复规律。研究结果表明:减小燃弧能量、提高触头运动速度可提高真空灭弧室介质的临界击穿电压;综合考虑燃弧时间与燃弧能量及触头开距的关系,随着燃弧时间的增加,真空灭弧室临界击穿电压先减小后增大。所得介质恢复规律可以作为新型断路器优化设计的参考依据。

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.