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Comparison of Offline VLF PD Measurements and Online PD Measurements on a 50-Year-Old Hydrogenerator Stator in Norway

dc.contributor.authorEberg, Espen
dc.contributor.authorAakre, Torstein Grav
dc.contributor.authorBerg, Gunnar
dc.contributor.authorHvidsten, Sverre
dc.date.accessioned2018-12-10T09:58:51Z
dc.date.available2018-12-10T09:58:51Z
dc.date.created2018-10-11T14:29:39Z
dc.date.issued2018
dc.identifier.citation2018 IEEE Electrical Insulation Conference - EICnb_NO
dc.identifier.isbn978-1-5386-4178-1
dc.identifier.urihttp://hdl.handle.net/11250/2576831
dc.description.abstractStator winding insulation is the part of the hydrogenerator experiencing the highest number and the most damaging failures. Partial discharge (PD) measurement, both offline and online, are commonly used for condition assessment and monitoring of electrical machines. The main concern of using very low frequency (VLF) methods is the changed electrical field distributions compared to that at power frequency. Hence, PD measurements performed at VLF should be carefully assessed and compared to PD measurements at power frequencies. In this work, offline PD measurement at VLF are presented and compared to power frequency online measurements of a 50-year-old hydrogenerator in Norway, using statistical analysis of phase resolved PD recordings. It is found that both offline VLF and online assessment can identify unnormal PD activity in a specific phase, although the phase resolved PD patterns are not similar for VLF offline and online assessment.nb_NO
dc.description.abstractComparison of Offline VLF PD Measurements and Online PD Measurements on a 50-Year-Old Hydrogenerator Stator in Norwaynb_NO
dc.language.isoengnb_NO
dc.publisherIEEEnb_NO
dc.relation.ispartof2018 IEEE Electrical Insulation Conference - EIC
dc.rightsNavngivelse 4.0 Internasjonal*
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/deed.no*
dc.titleComparison of Offline VLF PD Measurements and Online PD Measurements on a 50-Year-Old Hydrogenerator Stator in Norwaynb_NO
dc.typeChapternb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber542-546nb_NO
dc.identifier.cristin1619732
dc.relation.projectNorges forskningsråd: 255099nb_NO
cristin.unitcode7548,30,0,0
cristin.unitnameElkraftteknologi
cristin.ispublishedtrue
cristin.fulltextpreprint
cristin.qualitycode1


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