Propagating Process of DC Partial Arc on Wet-polluted Dielectric Surface

摘要

The evolution process can be divided into two categories--arc floating through the air,and the propagation of arc foot.High speed camera was used for observing the partial arc evolution process on the wet-polluted triangle glass plate under DC voltage,and the mechanism of arc evolution was analyzed.According to the investigating result,negative arc column is easier to float and propagate than positive arc column,and the positive arc is more likely to fork than negative arc on the partial arc extending processes were presented in this paper.The streamer between the arc column and the polluted surface is more likely to propagate,this phenomenon make the gap between the arc and the polluted surface has good conductivity,and then the floating arc column maintain easily.The positive arc lay close to the polluted surface,therefore the streamer is difficult to continuously develop,and so did the arc extent.On the contrary,the distance between the arc foot and the polluted surface guaranteed the streamer ignited from the arc foot can move forward rapidly and then new arc column leap-forward develops.