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dc.contributor.authorRunde, Magne
dc.contributor.authorKvien, Oddgeir
dc.contributor.authorFørster, Horst H.
dc.contributor.authorMagnusson, Niklas
dc.date.accessioned2019-09-11T13:45:21Z
dc.date.available2019-09-11T13:45:21Z
dc.date.created2019-06-03T12:57:37Z
dc.date.issued2019
dc.identifier.citationIEEE transactions on dielectrics and electrical insulation. 2019, 26 (3), 913-921.nb_NO
dc.identifier.issn1070-9878
dc.identifier.urihttp://hdl.handle.net/11250/2616419
dc.description.abstractPartial discharge measurements have been used for studying shrinkage voids in the insulation of mass-impregnated high voltage DC subsea power cables. Three 4.5-m long cable samples were subjected to ac partial discharge measurements at different ambient temperatures, both under isothermal conditions and after load current turnoffs. Two distinctly different phase resolved partial discharge patterns were observed, suggesting that two different "types" of cavities were created. The type causing by far the most powerful discharges appeared a few hours into the cooling period after load turn-off, which coincides in time with when load cycling breakdowns during type testing usually occur. Current loading has a significant effect on the cavities, as it leaves them – at least temporary – with a different dielectric strength afterwards. The mechanisms behind this change are not identified, but the associated time constants are of the order of days and weeks. Consequently, accurately determining the limitations of such cables with regard to their ability to withstand polarity reversals and rapid load changes may be more complicated than previously assumed.nb_NO
dc.description.abstractCavities in Mass-Impregnated HVDC Subsea Cables Studied by AC Partial Discharge Measurementsnb_NO
dc.language.isoengnb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/deed.no*
dc.subjectcable insulationnb_NO
dc.subjectpartial dischargesnb_NO
dc.subjectcavity resonatorsnb_NO
dc.subjectpower cablesnb_NO
dc.subjectHVDC transmissionnb_NO
dc.subjectpartial discharge measurementnb_NO
dc.titleCavities in Mass-Impregnated HVDC Subsea Cables Studied by AC Partial Discharge Measurementsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.rights.holderIEEEnb_NO
dc.source.pagenumber913-921nb_NO
dc.source.volume26nb_NO
dc.source.journalIEEE transactions on dielectrics and electrical insulationnb_NO
dc.source.issue3nb_NO
dc.identifier.doi10.1109/TDEI.2018.007867
dc.identifier.cristin1702275
dc.relation.projectNorges forskningsråd: 208726nb_NO
dc.relation.projectNorges forskningsråd: 256505nb_NO
cristin.unitcode7548,30,0,0
cristin.unitnameElkraftteknologi
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode2


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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
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