{"title":"Electrical treeing in extruded polypropylene high voltage cable insulation","authors":"J. Holto, E. Ildstad","doi":"10.1109/ICHVE.2010.5640748","DOIUrl":null,"url":null,"abstract":"In this study electrical tree growth in extruded isotactic and syndiotactic polypropylene (i-PP and s-PP) was compared, using a needle-plane geometry. Two main types of treeing were observed, either with one or multiple branches to the ground electrode before breakdown. Highest degree of simple branched trees was found in s-PP. The degree of crystallinity in s-PP was 53% lower than in i- PP and the spherulites size was found to be 5-15 times larger in i-PP than the crystalline areas observed in s-PP. The elasticity modulus for s-PP was half of that measured for i-PP. Despite these differences no significant difference in the propagation rate or time to breakdown during electrical tree growth was found.","PeriodicalId":287425,"journal":{"name":"2010 International Conference on High Voltage Engineering and Application","volume":"24 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2010-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"5","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2010 International Conference on High Voltage Engineering and Application","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ICHVE.2010.5640748","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 5
Abstract
In this study electrical tree growth in extruded isotactic and syndiotactic polypropylene (i-PP and s-PP) was compared, using a needle-plane geometry. Two main types of treeing were observed, either with one or multiple branches to the ground electrode before breakdown. Highest degree of simple branched trees was found in s-PP. The degree of crystallinity in s-PP was 53% lower than in i- PP and the spherulites size was found to be 5-15 times larger in i-PP than the crystalline areas observed in s-PP. The elasticity modulus for s-PP was half of that measured for i-PP. Despite these differences no significant difference in the propagation rate or time to breakdown during electrical tree growth was found.
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