Creeping Discharge Phenomena along Aerial Insulated Wire

在高压架空配电系统中，绝缘导线支撑点存在复合绝缘系统。当雷击发生在它们附近时，在导线的中心线上产生雷击浪涌。雷电浪涌引起绝缘子闪络时，沿导线表面产生蠕变放电。这样，配电线路就会面临熔丝失效的危险。为了防止这种事故的发生，对蠕变放电的解释是非常重要的。然而，它的属性在很大程度上仍然未知。研究了在不同波前峰值和波前持续时间的冲击电压作用下沿导线表面产生的蠕变放电的特性。现澄清如下。正保持放电(1)长度长度不受波前持续时间影响。它随外加脉冲电压的峰值而增大。其相位不受波前持续时间和施加冲击电压峰值的影响。它沿着钢丝表面发展，有跳跃。(1)长度在标准雷击中，长度在30 ~ 50kV增大，在50 ~ 90kV减小，在90kV以上又增大。当波前持续时间为8 μ s时，波前长度随施加脉冲电压的峰值单调增加。(2)方面在标准雷击中，在50kV以下以导线表面蠕变发展。在90kV以上常出现蠕变、弧形跳变和不规则跳变。随着波前持续时间的增加，放电尖端的跳变现象得到抑制。负蠕变放电受波前持续时间的显著影响。

In high voltage aerial distribution systems, a compound insulation system exists in insulated wire supporting points. 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. Then, the distribution lines are exposed to danger of the wire melting failure. In order to prevent this accident, the elucidation of the creeping discharge is very important. However, its property remain largely unknown.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 ceeeping discharge (1)Length The length does not influenced by the duration of wave front. It increases with the peak value of applied impulse voltage. (2)Aspect Its aspect does not influenced by the duration of wave front and the peak value of applied impulse voltage. It develops along the wire surface with jumping.2. Negative creeping discharge (1)Length In the standard lightning impulse, the length increases at 30 to 50kV, decreases at 50 to 90kV and increases again at over 90kV. In the case of duration of wave front 8 μ s, the length increases monotonously with the peak value of applied impulse voltage. (2)Aspect In the standard lightning impulse, it develops with creeping the wire surface at under 50kV. The creeping aspect, jumping like an arc aspect and descreat jumping aspect always appear at over 90kV. The jumping phenomena at the discharge tip restrain with increasing the duration of wave front. The negative creeping discharge is influenced remarkably by the duration of wave fronts.