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dc.contributor.authorMeyer, Hans Kristian Hygen
dc.contributor.authorMarskar, Robert
dc.contributor.authorBlaszczyk, Andreas
dc.contributor.authorMauseth, Frank
dc.contributor.authorPedersen, Per Atle
dc.date.accessioned2020-01-21T10:04:39Z
dc.date.available2020-01-21T10:04:39Z
dc.date.created2019-02-28T09:00:18Z
dc.date.issued2019
dc.identifier.citationIEEE transactions on dielectrics and electrical insulation. 2019, 26 (4), .nb_NO
dc.identifier.issn1070-9878
dc.identifier.urihttp://hdl.handle.net/11250/2637184
dc.description.abstractStreamer behaviour near dielectric surfaces is an important characteristic of air-solid electrical insulation systems. Accurate predictions are important for dielectric design, but dynamic aspects such as surface charging during streamer propagation are not well understood. A drift-diffusion model is used here to simulate positive streamer behaviour in non-uniform fields. The 2D-planar simulation domain includes air gaps between a tip of a HV electrode and a dielectric barrier laying on a grounded plane. The resulting surface charge distributions approach saturation charge conditions, i.e. zero normal electric field on the air side of the boundary. Such charging behaviour was also reported in lightning impulse (LI) experiments. The simulations are also aligned with empirical streamer propagation range estimates. It is demonstrated that saturation charge levels are reachable within a few tens of nanoseconds of exposure to positive streamer channels. Ion drift is shown to be the dominating mechanism of surface charging during positive streamer propagation, although photoemission also plays an important role. Discharge suppression by streamer-deposited surface charge is also demonstrated. Furthermore, the influence of back discharges at the LI tail on the surface charge distribution is shown. Simulating realistic streamer surface charging behaviour with arbitrary electrode and dielectric shapes is an important step toward first principles discharge prediction models.nb_NO
dc.language.isoengnb_NO
dc.publisherIEEEnb_NO
dc.titleStreamer and surface charge dynamics in non-uniform air gaps with a dielectric barriernb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.pagenumber8nb_NO
dc.source.volume26nb_NO
dc.source.journalIEEE transactions on dielectrics and electrical insulationnb_NO
dc.source.issue4nb_NO
dc.identifier.doihttps://doi.org/10.1109/TDEI.2019.007929
dc.identifier.cristin1681210
dc.relation.projectNorges forskningsråd: 245422nb_NO
dc.description.localcode© 2019 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.unitcode194,63,20,0
cristin.unitnameInstitutt for elkraftteknikk
cristin.ispublishedfalse
cristin.fulltextpostprint
cristin.qualitycode2


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