Creeping Discharge Phenomena along Aerial Insulated Wire

在高压架空配电系统中，架空绝缘线由绝缘子和电灯杆上的绑扎线支撑。当雷击发生在他们附近时，雷电波就会感应到电线的中心线。如果绝缘子在雷电冲击下发生闪络，则蠕变放电可从绑扎线自由端沿导线表面发展。然后，导线暴露在导线熔化失败的危险中。为了防止这一事故的发生，对蠕变放电的解释是非常重要的。我们研究了在不同峰值和波前持续时间的脉冲电压作用下，沿导线表面发展的蠕动放电的特性。现已澄清如下：1.正向蠕动放电：(1)长度该长度不受波前持续时间的影响。它随外加冲击电压Vm的峰值增大而增大。但是，使用Tf来抑制该长度。(2)方面沿线材表面发展，跳跃与Tf和Vm无关。负蠕变放电：(1)长度在Tf≒1.2μS中出现，长度的增加和减少区域随Tf的增加而减小。(2)在Tf≦≦100.0μS中，当Vm≧为70kV时，蠕变放电从导线表面跳出，而在TF≒8.0μS中，蠕变放电不依赖于Vm而附着在放电尖端的导线表面，说明负蠕变放电的长度与角度密切相关。

In high voltage aerial distribution systems, the aerial insulated wires are supported by the insulators and the binding wires at the electric light poles. When the lightning strike occurs in their neighborhood, a lightning surge is induced to the central line of the wire. If the flashover of insulator happens by the lightning surge, the creeping discharge can develop along the wire surface from free end of the binding wire. Then, the wires are exposed to danger of the wire melting failure. In order to prevent this accident, the elucidation of the creeping discharge is very important.We investigated the property of creeping discharge which develops along the wire surface under the impulse voltage application with various peak values and duration of wave fronts. It has been clarified as follows.1. Positive creeping discharge : (1) Length The length does not influenced by the duration of wave front Tf. It increases with the peak value of applied impulse voltage Vm. However, the length is suppressed with Tf. (2) Aspect It develops along the wire surface with jumping independent of Tf and Vm.2. Negative creeping discharge : (1)Length The increase and decrease regions of the length appears in Tf ≒ 1.2μs. The decrease region reduces with the increase of Tf. The length increases with the increase of Vm in 8.0 ≦ Tf ≦ 100.0μs.(2) Aspect The creeping discharge adheres to the wire surface at the tip of the binding wire and jumps from the wire surface at the tip of discharge at Vm ≧ 70kV in Tf ≒ 1.2μs. However, it adheres to the wire surface at the tip of discharge independent of Vm in Tf ≧ 8.0μs. It was clarified that the length of negative creeping discharge was closely related to the aspect.