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Thermal Damage Process and Failure Mechanism of Epoxy/SF6 Composite Insulation Subjected to Arc Ablation
IEEE Transactions on Dielectrics and Electrical Insulation ( IF 3.1 ) Pub Date : 2020-12-01 , DOI: 10.1109/tdei.2020.008858
Wenxia Sima , Ze Yin , Potao Sun , Licheng Li , Qianqiu Shao , Tao Yuan , Ming Yang

In this work, the effects of arc ablation on the surface of epoxy (EP) in EP/SF6 composite insulation are analyzed. Based on the results, the characteristics of streamers on the surface of EP is captured by a photomultiplier array and the failure mechanism of the EP is studied. The results show that the arc heat flow applied to the EP/SF6 interface can lead to the decomposition of EP molecular chains and degradation of the SF6. The pyrolysis products re-couple to generate complex carbides and pyrolysis gases, resulting in severe irregular carbonization on the EP surface and the increase in surface conductivity. When an external electric field is applied, a large quantity of photons will accumulate in the carbonization region on the EP surface and this gives rise to the surface streamer and thereby greatly decreases the surface electrical strength of EP/SF6 composite insulation.

中文翻译:

环氧/SF6复合绝缘电弧烧蚀热损伤过程及失效机理

在这项工作中,分析了电弧烧蚀对 EP/SF6 复合绝缘材料中环氧树脂 (EP) 表面的影响。在此基础上,利用光电倍增管阵列捕获EP表面的拖缆特性,研究EP的失效机理。结果表明,电弧热流作用于 EP/SF6 界面会导致 EP 分子链分解和 SF6 降解。热解产物重新耦合生成复合碳化物和热解气体,导致极压表面严重不规则碳化,表面电导率增加。当施加外电场时,
更新日期:2020-12-01
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