{"title":"Relation between the halo and water trees in XLPE cables","authors":"S. Pélissou","doi":"10.1109/CEIDP.1988.26316","DOIUrl":null,"url":null,"abstract":"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.<<ETX>>","PeriodicalId":149735,"journal":{"name":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","volume":"87 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1988-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1988. Annual Report., Conference on Electrical Insulation and Dielectric Phenomena","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/CEIDP.1988.26316","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 3
Abstract
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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