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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：
17560275
负责人：
NISHI Toshiyuki
金额：
$ 2.24万
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：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560275/
关键词：
aerial insulated wire creeping discharge lightning impulse lightning countermeasure 雷外対策

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 invades to the central line of wire. If the flashover of insulator happens by the lightning surge, the creeping discharge can develop along the wire surface. 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 peak values Vm=±90, ±100kV and duration of wave fronts Tf=1.2-100.0μS. It has been clarified as follows.1. Positive ceeping discharge :(1)Developing length The developing length does not influenced by the duration of wave front Tf=1.2-8.0μs. At durations of wave front Tf=10.0-100.0 μs, the developing length becomes short when the duration of wave front becomes long. (2)Aspect It develops along the wire surface with jumping independent of Tf and Vm.2. Negative creeping discharge :(1)Developing length The increase and decrease regions of the developing length appears with the increase of Vm in Tf=1.2-20μs. The length increases monotonously with the increase of Vm in Tf=50 and 100μs. However, the developing length shows a restrained tendency with the increase of Tf. (2)Aspect The discrete jump phenomenon which occurs at the discharge tip in Vm≦100 kV is restrained with the increase of Tf. It was clarified that the decline of the jump phenomenon at the discharge tip in the negative creeping discharge made a developing length long.

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，雷电波侵入导线的中心线。当绝缘子在雷电冲击下发生闪络时，沿面放电可沿导线表面沿着发展。然后，导线暴露于导线熔化故障的危险中。为了防止这种事故的发生，对沿面放电的机理进行研究是非常重要的，本文研究了在峰值电压Vm=±90，± 100 kV，波前持续时间Tf=1.2-100.0μS的冲击电压作用下沿导线表面沿着发展的沿面放电的特性。现澄清如下。1.（1）正向放电：（1）发展长度：发展长度不受波前持续时间Tf=1.2-8.0μs的影响。在波前持续时间Tf=10.0-100.0 μs时，波前持续时间越长，发展长度越短。（2）外观沿丝面沿着发展，跳跃与Tf和Vm无关.负沿面放电：（1）发展长度在Tf=1.2 ~ 20μs范围内，随着Vm的增大，发展长度出现增大和减小的区域。在Tf=50和100μs时，随着Vm的增加，长度单调增加。随着转铁蛋白含量的增加，其发育长度呈抑制趋势。（2）方面在Vm ≤ 100 kV范围内，随着Tf的增加，放电尖端出现的离散跳跃现象得到抑制。明确了负沿面放电中放电尖端处的跳跃现象的下降使得发展长度变长。