交联聚乙烯电缆中光晕与水树的关系

1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 1988-10-16 DOI:10.1109/CEIDP.1988.26316

S. Pélissou

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引用次数: 3

摘要

用显微光度法精确测量了蒸汽固化高压交联聚乙烯电缆绝缘层上的光晕或微腔密度分布，并与水含量测量结果相关联。所研究的电缆是138kv类型(约=23毫米绝缘壁)，在其6年的服务中经历了几次故障。80 μ m以上的水树密度与晕的存在密切相关，即高浓度区域。矮一些的树大多位于隔热层的中间，那里的含水量很低。形成的光晕作为水库，促进了领结树的生长。在高于XLPE熔点的温度下进行热处理，光晕会完全消失，但水树不会。

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Relation between the halo and water trees in XLPE cables

The distribution of the halo or microcavity density across the insulation of steam-cured high-voltage XLPE (cross-linked polyethylene) cables was measured precisely by microphotometry and correlated with water-content measurements. The cable studied was the 138-kV type ( approximately=23-mm insulation wall) and had experienced several failures during its six years in service. The density of water trees over 80 mu m long is strongly related to the presence of the halo, i.e. high water-concentration regions. Shorter trees are located mostly in the middle of the insulation where the water content is very low. The halo is formed to act as a water reservoir, facilitating the growth of bow-tie trees. Heat treatment at a temperature higher than the XLPE melting point causes the halo to disappear totally, but not the water trees.<>

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来源期刊

1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena

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