摘要
飘弧和弧道在湿污表面沿泄漏距离的延伸是局部电弧演变的主要环节。利用高速摄像机观测了不同极性直流局部电弧在湿污表面的演变过程,并从气体放电理论分析和解释了出现上述现象的原因。观测结果表明,负极性电弧比正极性电弧飘弧更严重,且负极性电弧延伸速率高于正极性电弧;电弧延伸过程中,正极性电弧更容易出现分叉和并列弧道的现象,负极性电弧更易出现尖状的头部。负极性电弧更易飘弧是由于电弧与污层之间的流注更易发展,使负极性电弧和污层之间更易保持良好的导电通道,所以飘弧更易维持,也更严重;正极性电弧端部紧贴污层表面,使流注难以发展,电弧延伸困难,而负极性电弧端部和污层之间的距离则保证了起始于电弧端部的负流注迅速向前发展并形成新的电弧,使负极性电弧向前跃进式延伸。
The evolutionand the propagation of arcprocess on the wet-pollutedprocess can be divided into two categories arc floating through the air,foot. High speed camera is used for observing the partial arc evolutiontriangle glass plate under DC voltage, and the mechanism of arc evolutionis analyzed. According to the investigating result, negative are column is easier to float and propagatethan positive arc column, and the positive arc is more likely to fork than negative arc on the partial arcextending processes are presented in this paper. The streamer between the arc column and the pollutedsurface is more likely to propagate, this phenomenon make the gap between the arc and the pollutedsurface has good conductivity, and then the floating arc column maintain easily. The positive arc layclose to the polluted surface, therefore the streamer is difficult to continuously develop, and so did thearc extension. On the contrary, the distance between the arc foot and the polluted surface guaranteedthe streamer ignited from the arc foot can move forward rapidly and then new arc column leap-forwarddevelops.
出处
《电瓷避雷器》
CAS
北大核心
2017年第1期154-159,共6页
Insulators and Surge Arresters
关键词
直流局部电弧
湿污表面
飘弧
弧道延伸
流注
DC partial arc
wet-polluted surface
arc flow
arc extension
streamer
