| 低温下聚合物的树枝状放电 |
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| 引用本文： | 梁志钰,姚建国,郝逢年,吴维韩.低温下聚合物的树枝状放电[J].清华大学学报(自然科学版),1991(1). |
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| 作者姓名： | 梁志钰 姚建国 郝逢年 吴维韩 |
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| 作者单位： | 电机工程与应用电子技术系
(梁志钰，姚建国，郝逢年)，电机工程与应用电子技术系(吴维韩) |
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| 摘 要： | 针对低温电工绝缘的实际应用和低温电老化机理的探讨，通过针尖电极试验，着重研究了超高分子量聚乙烯的特性；并将它与交联聚乙烯、低密度聚乙烯做了对比。结果表明，机械应力下疲劳强度的劣化是低温电树枝化的重要因素。超高分子量聚乙烯具有低温性能好。不会开裂，适用于低温电工绝缘的特点。
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| 关 键 词： | 低温电工绝缘 聚乙烯 电树 |
Electrical Treeing of Polymers at Cryogenic Temperature |
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| Liang Zhiyu,Yao Jianguo,Hao Fengnian,Wu Weihan.Electrical Treeing of Polymers at Cryogenic Temperature[J].Journal of Tsinghua University(Science and Technology),1991(1). |
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| Authors: | Liang Zhiyu Yao Jianguo Hao Fengnian Wu Weihan |
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| Institution: | Department of Electrical Engineering |
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| Abstract: | : With regard to the practical application and the ageing mechanism of polymer insulation at cryogenic temperature, the electrical tree initiation and growth of ultra-high molecular weight polyethylene (UHMW-PE) at 77 K and room temperature are investigated in comparison with those of XLPE or LDPE. The test results with the needle-plane electrode system under ac voltage at 77 K indicate that the fatigue break in UHMW-PE under mechanical forces during the electrical treeing is a critical factor. Owing to its excellent cryogenic properties, only UHMWPE does not crack during the test. It is a good material for the electrical insulation at cryogenic temperature. |
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| Keywords: | cryogenic dielectric polyethylene insulation electrical tree |
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