中压空气直流断路器中的电弧特性的实验研究

In this paper, the arc characteristic in a certain type of medium-voltage circuit breaker is investigated through experiment. The dynamic process of the arc evolution is observed with a deliberately designed experimental setup. Via the experiment, the phenomena of arc commutation and stagnation are caught through both arc voltage wave and high-speed camera results. The influence of arc current on the arc behaviour is also discussed primarily. It is discovered that the arc will burn between the contacts continuously without commutation and motion when the current is decreased to a certain threshold value. And in this case, an assisting measure should be taken to help the complement of the arc interruption. For that sake, a simple magnetic system is added to increase the arc propulsion. The interruption characteristic of this circuit breaker with this added system is also investigated.