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Effect of Tracking and Treeing on Impulse Breakdown in Solid insulator

跟踪和树化对固体绝缘子脉冲击穿的影响

基本信息

批准号：
11650334
负责人：
HANAOKA Ryoichi
金额：
$ 2.18万
依托单位：
KANAZAWA INSTITUTE 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：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11650334/
关键词：
Standard lightning impulse voltage Creepage discharge Polymethylmethacrylate Epoxy glass mat laminate Discharge spots Discharge current Electrical treeing Oriented extended chain crystal polyethylene 沿面放電変圧器油ポリエチレン絶縁電線トリーイングトラッ

项目摘要

Using a standard lightning impulse voltage, the propagation aspects of a creepage discharge over the surface of oil-immersed solid insulators, high density polyethylene (HDPE), epoxy resin (EP) and epoxy glass mat laminate (EGML), have been observed by means of a camera equipped with an image intensifier. The creepage discharge over the surface of EGML revealed to a distinctive aspect which had the luminous discharge spots on the streamers. It was clarified that this phenomenon was attributed to the existence of a glass fiber ingredient in EGML and the discharge energy was increased by the occurrence of the discharge spots.On the other hand, the treeing properties of PMMA (polymethylmethacrylate) were studied by the intermittent lightning impulse voltage to either the point-plane or the point-point electrode system. The forms and extension lengths of the electrical tree revealed clearly the polarity effect on the applied voltage. The growth of electrical trees was greatly restrained when the impulse voltage was applied to the point electrode more than 4 times. This test result was attributed to the electric charge accumulated by the initial tree generation due to the first voltage application.Furthermore, the oriented ECCPE (Extended Chain Crystal Polyethylene) of a large size was newly developed. Electrical treeing discharges of ECCPE were investigated using a needle to plate electrode system. The direction of the tree-growth was completely controlled by the orientation of ECCPE.When the orientation was parallel to an electric field, the tree propagated as a single line without branchings. When the orientation was vertical to the electric field, it propagated to the orientation direction without branchings. Treeing discharge current also revealed the remarkable difference on orientation directions.The results obtained in this investigation are promising for a field of electrical insulations.

采用标准雷电冲击电压，用装有像增强器的照相机观测了高密度聚乙烯（HDPE）、环氧树脂（EP）和环氧玻璃纤维毡（EGML）油浸固体绝缘子表面爬电放电的传播情况。EGML表面的爬电放电显示出一个独特的方面，即在流光上有发光的放电点。研究表明，这一现象是由于EGML中含有玻璃纤维成分，放电斑的出现提高了放电能量。另一方面，研究了点-面电极系统和点-点电极系统的间歇雷电脉冲电压对PMMA（聚甲基丙烯酸甲酯）树枝化特性的影响。电树的形状和延伸长度清楚地反映了外加电压的极性效应。当脉冲电压作用在点电极上超过4次时，电树枝的生长受到很大的抑制。该试验结果归因于第一次施加电压引起的初始树生成所累积的电荷。此外，新开发了大尺寸的定向ECCPE（扩展链结晶聚乙烯）。用针-板电极系统研究了ECCPE的电树枝放电。树木的生长方向完全由ECCPE的取向控制，当取向与电场平行时，树木以单线生长，没有分支。当取向垂直于电场方向时，它向取向方向传播，没有分支。树枝状放电电流也揭示了取向方向上的显著差异。