Creeping Discharge Phenomena along Aerial Insulated Wire

在高压架空配电系统中，架空绝缘导线由电线杆上的绝缘子和绑扎线支撑。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。若因雷击浪涌引起绝缘子闪络，则从束缚线自由端沿导线表面产生蠕变放电。然后，电线暴露在电线熔化失效的危险中。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。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。正向蠕变放电：(1)长度长度不受波前持续时间Tf的影响。它随着施加冲击电压Vm的峰值而增大。然而，长度受到Tf的抑制。(2)外形：沿线材表面发展，不受Tf和vm的影响。负蠕变放电：(1)长度长度的增加和减少的区域呈现在Tf的≒1.2μs中。减小区随Tf的增大而减小。长度在8.0≦Tf≦100.0μs范围内随Vm的增加而增加。蠕变放电的弧长为1.2μs，其弧长为≧70kV，其弧长为1.2μs。而在Tf≧8.0μs时，其粘附在放电尖端线表面与Vm无关。明确了负蠕变放电长度与坡面密切相关。

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.