428 / 2017-04-27 20:27:27

Experiment research on Post-arc Current in DC Vacuum Circuit Breakers

13690,13689,13627,13688

The current zero period of the vacuum arc determines the breaking performance of the vacuum circuit breakers, and the arc current is one of the main parameters of the current zero periods. DC vacuum circuit breaker is one of the practical solutions to solve the bottleneck of DC transmission circuit breaker. It is difficult to measure the post-arc current, when artificial current zero method is used to break the DC short circuit fault, because the current drop rate is very large. In this paper, the experimental circuit is built, and the post-arc current with different commutation parameters is measured by the resistance-transfer method. The results show that the peak of post-arc current is related to the arcing time and the drop rate of current zero period. When the arcing time is longer, the arc current is larger, and the di/dt value of current zero period is larger, the peak of post-arc current is larger. The experimental waveform also validates the phenomenon that high-energy particles penetrate the sheath at the beginning of sheath development.