Water treeing in thermally preoxidized cross-linked polyethenecable insulation

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DOIResolve DOI: http://doi.org/10.1109/ELINSL.1990.109734
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TypeArticle
Proceedings titleConference Record of the 1990 IEEE International Symposium on Electrical Insulation
ConferenceConference record of the 1990 IEEE International Symposium on Electrical Insulation June 3-6, 1990, Toronto, Ontario, Canada
ISSN1089-084X
Pages173177; # of pages: 5
AbstractPresented in the paper are results of water treeing tests on theinsulation of unaged, cross-linked polyethylene cable which has been thermally preoxidized to levels typical of those measured in field aged cable insulations after several years of service. The tests showed that moderate levels of oxidation present in the insulation prior to voltage aging have no significant effect on initiation and growth of vented water trees. However preoxidized specimens grew fewer and shorter bow-tie trees than non-preoxidized specimens. Insulation tested at a lower electric stress exhibited larger retention of the initial breakdown strength after aging than the insulation tested at a higher stress even though the lengths of the water trees were comparable for both insulations. For all preoxidation conditions water treeing caused some depletion of the antioxidant from the insulation. Non-preoxidized specimens did not show any excess of oxidation with time of electrical aging even after development of very heavy treeing. However preoxidized samples did show increasing oxidation inside water treed regions as compared with electrically unaged specimens.
Publication date
PublisherIEEE
LanguageEnglish
AffiliationNRC Institute for National Measurement Standards; Measurement Science and Standards; National Research Council Canada
Peer reviewedNo
NRC number31750
4335
NPARC number5763615
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Record identifier784f88b1-eb79-43cc-a595-3e0bc187a5f7
Record created2009-03-29
Record modified2016-05-09
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