| dc.contributor.author | Eberg, Espen | |
| dc.contributor.author | Aakre, Torstein Grav | |
| dc.contributor.author | Berg, Gunnar | |
| dc.contributor.author | Hvidsten, Sverre | |
| dc.date.accessioned | 2019-02-25T11:39:29Z | |
| dc.date.available | 2019-02-25T11:39:29Z | |
| dc.date.created | 2018-10-11T14:29:39Z | |
| dc.date.issued | 2018 | |
| dc.identifier.isbn | 978-1-5386-4178-1 | |
| dc.identifier.uri | http://hdl.handle.net/11250/2587220 | |
| dc.description.abstract | Stator 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.language.iso | eng | nb_NO |
| dc.publisher | Institute of Electrical and Electronics Engineers (IEEE) | nb_NO |
| dc.relation.ispartof | 2018 IEEE Electrical Insulation Conference - EIC | |
| dc.title | Comparison of Offline VLF PD Measurements and Online PD Measurements on a 50-Year-Old Hydrogenerator Stator in Norway | nb_NO |
| dc.type | Chapter | nb_NO |
| dc.description.version | submittedVersion | nb_NO |
| dc.source.pagenumber | 542-546 | nb_NO |
| dc.identifier.doi | 10.1109/EIC.2018.8481080 | |
| dc.identifier.cristin | 1619732 | |
| dc.relation.project | Norges forskningsråd: 255099 | nb_NO |
| dc.description.localcode | © 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. | nb_NO |
| cristin.unitcode | 194,63,20,0 | |
| cristin.unitname | Institutt for elkraftteknikk | |
| cristin.ispublished | true | |
| cristin.fulltext | preprint | |
| cristin.qualitycode | 1 | |
