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Creeping Discharge Phenomena along Aerial Insulated Wire

沿架空绝缘电线的沿面放电现象

基本信息

批准号：
12650298
负责人：
NISHI Toshiyuki
金额：
$ 2.11万
依托单位：
Toyama National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12650298/
关键词：
aerial insulated wire creeping discharge lightning impulse lightning countermeasure

项目摘要

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.

在高压架空配电系统中，绝缘线支撑点存在复合绝缘系统。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，则可沿导线表面产生蠕变放电。这样，配电线路就暴露在熔线故障的危险中。为了防止这一事故的发生，对蠕动放电的澄清是非常重要的。然而，其性质目前还不清楚。我们研究了在不同峰值和波前持续时间的冲击电压作用下，沿导线表面发展的蠕变放电的特性。现已澄清如下：1.正向窃听放电(1)长度该长度不受波前持续时间的影响。它随着外加冲击电压峰值的增大而增大。(2)角度不受波前持续时间和外加冲击电压峰值的影响。它是沿着金属丝表面跳跃发展的。负蠕变放电长度(1)在标准雷电冲击下，在30~50KV时增加，在50~90KV时减小，在90KV以上时又增加。在S波阵面持续时间为8μ的情况下，波前长度随外加冲击电压的峰值单调增加。(2)在标准雷电冲击方面，在50KV以下，随着导线表面的蠕变而发展。爬行、弧形跳跃和爬行跳跃都出现在90KV以上。随着波阵面持续时间的增加，放电尖端的跳跃现象受到抑制。负蠕变流量受波前持续时间的影响较大。