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dc.contributor.authorHygen Meyer, Hans Kristian
dc.contributor.authorMauseth, Frank
dc.contributor.authorPedersen, Per Atle
dc.contributor.authorMartine, Husøy
dc.date.accessioned2017-10-05T08:01:51Z
dc.date.available2017-10-05T08:01:51Z
dc.date.created2017-09-20T11:24:06Z
dc.date.issued2017
dc.identifier.issn2535-3969
dc.identifier.urihttp://hdl.handle.net/11250/2458587
dc.description.abstractPrediction of withstand voltages in air-insulated systems are made on the basis of empirical models that are not sufficiently accurate for complex geometries. Bet-ter understanding of the spatio temporal development of electrical discharges is necessary to improve the present models. Discharges in lightning impulse stressed 20–100 mmrod-plane gaps are examined using a high-speed camera, photo-multiplier tubes (PMTs) and a high-bandwidth current measurement system.The images and measurements of gaps larger than 20 mm show a fast initial streamer discharge with a current rise time of some tens of ns, followed by a dark period of a few μs and a propagation of a slower leader-type channel leading to breakdown. The breakdown mechanisms in the shortest gaps are faster and geometry dependent,probably occuring by heating of initial streamer channels. Different light filters used with the PMTs indicate that all parts of the leader-type discharge development emit light over a spectrum from UV to IR. The initial discharges emit low amounts of warm light and IR compared to the leader-type channel. Finally, it is suggested that empirical breakdown voltage prediction models should be interpreted in light of the leader-type breakdown mechanism.nb_NO
dc.language.isoengnb_NO
dc.publisherNord-IS, NNTUnb_NO
dc.titleBreakdown in short rod-plane air gaps under positive lightning impulse stressnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.journalProceedings of the Nordic Insulation Symposiumnb_NO
dc.identifier.cristin1495788
dc.description.localcodeThis is the authors' accepted and refereed manuscript to the article.nb_NO
cristin.unitcode194,63,20,0
cristin.unitnameInstitutt for elkraftteknikk
cristin.ispublishedtrue
cristin.fulltextpostprint


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