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Modeling cathode spots in vacuum arcs burning on multi-component contacts

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dc.contributor.authorBenilov, M. S.
dc.contributor.authorBenilova, L. G.
dc.contributor.authorCunha, M. D.
dc.contributor.authorHartmann, W.
dc.contributor.authorLawall, A.
dc.contributor.authorWenzel, N.
dc.date.accessioned2022-09-01T09:53:41Z
dc.date.available2022-09-01T09:53:41Z
dc.date.issued2012
dc.description.abstractA self-consistent space-resolved numerical model of cathode spots in vacuum arcs is developed on the basis of the COMSOL Multiphysics software. The model is applied to cathode spots on copper-chromium (CuCr) contacts of vacuum interrupters. In the limiting case of large grains, the main effect of change in cathode material from Cu to Cr is the reduction of thermal conductivity of the cathode material, which causes a reduction of spot radius and spot current. Hence, the model indicates that spots with currents of the order of tens of amperes on Cu coexist with spots on Cr with currents between one and two amperes. The parameters of spots on small Cr grains of the order of 10 µm size are rather close to those of spots on pure Cu, whereas the parameters for spots on medium-size Cr grains of around 20 µm are quite different from those of spots on both pure Cu and pure Cr. The power flux is directed from the cathode into the plasma, i.e., it is the cathode that heats the plasma – and not the other way round. What maintains the spot is a substantial Joule heating inside the cathode bulk. About 70 percent of the heat is generated in the grain and 30 percent in the surrounding copper. One may hypothesize that such grains are highly unstable, leading to explosive-like behavior with a consequent additional loss of cathode material, and a severe limitation in spot lifetime.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBenilov, M. S., Benilova, L. G., Cunha, M. D., Hartmann, W., Lawall, A., & Wenzel, N. (2012, September). Modeling cathode spots in vacuum arcs burning on multi-component contacts. In 2012 25th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV) (pp. 317-320). IEEE.pt_PT
dc.identifier.doi10.1109/DEIV.2012.6412517pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4543
dc.language.isoengpt_PT
dc.publisherIEEEpt_PT
dc.relationCathode spots in high-pressure DC gas discharges: self-organization phenomena
dc.relationStrategic Project - UI 219 - 2011-2012
dc.relation.publisherversionhttps://ieeexplore.ieee.org/abstract/document/6412517pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectCathode spotspt_PT
dc.subjectModeling cathode spotspt_PT
dc.subjectVacuum arcspt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleModeling cathode spots in vacuum arcs burning on multi-component contactspt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardTitleCathode spots in high-pressure DC gas discharges: self-organization phenomena
oaire.awardTitleStrategic Project - UI 219 - 2011-2012
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FFIS%2F68609%2F2006/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/PEst-OE%2FMAT%2FUI0219%2F2011/PT
oaire.citation.endPage320pt_PT
oaire.citation.startPage317pt_PT
oaire.citation.title2012 25th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)pt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameBenilov
person.familyNameCunha
person.givenNameMikhail
person.givenNameMário
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0001-9059-1948
person.identifier.orcid0000-0002-0397-536X
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id7005138676
person.identifier.scopus-author-id7102711276
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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relation.isAuthorOfPublication.latestForDiscovery5ccf95a3-53d5-446c-857c-55d64b887175
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