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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：
15560263
负责人：
NISHI Toshiyuki
金额：
$ 2.37万
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：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560263/
关键词：
aerial insulated wire creeping discharge lightning impulse lightning countermeasure

项目摘要

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.

在高压架空配电系统中，架空绝缘导线由绝缘子和电线杆处的绑线支撑。当雷击发生在其附近时，在导线的中心线上感应出雷电浪涌。当绝缘子在雷电冲击下发生闪络时，沿面放电可从绑线自由端沿沿着导线表面发展。然后，导线暴露于导线熔化故障的危险中。为了防止这类事故的发生，对沿面放电的机理进行研究是非常重要的，本文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沿着导线表面发展的沿面放电特性。现澄清如下。1.正向沿面放电：（1）长度长度不受波前持续时间Tf的影响。它随着所施加的冲击电压Vm的峰值而增大。然而，长度被Tf抑制。(2)方面它沿着导线表面发展，跳跃独立于Tf和Vm。负沿面放电：（1）长度在Tf <1.2μs时出现长度的增大和减小区域。随着Tf的增加，下降区域减小。在8.0 μ Tf ~ 100.0μs范围内，随着Vm的增加，长度增加。(2)在Vm <$70 kV，Tf <$1.2 μs的条件下，沿面放电在绑线端部附着在导线表面，在放电端部从导线表面跳跃。然而，在Tf <8.0μs时，它在放电尖端处粘附到丝表面，与Vm无关。阐明了负沿面放电的长度与该方面密切相关。