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Modeling spots on composite copper-chromium contacts of vacuum arcs and their stability

2015Journal article Open access
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dc.contributor.authorBenilov, Mikhail S.
dc.contributor.authorCunha, Mário D.
dc.contributor.authorHartmann, Werner
dc.contributor.authorKosse, Sylvio
dc.contributor.authorLawall, Andreas
dc.contributor.authorWenzel, Norbert
dc.date.accessioned2022-09-02T14:26:02Z
dc.date.available2022-09-02T14:26:02Z
dc.date.issued2015
dc.description.abstractCathode spots on copper–chromium contacts of vacuum interrupters are simulated by means of a self-consistent space-resolved numerical model of cathode spots in vacuum arcs developed on the basis of the COMSOL Multiphysics software. Attention is focused on spots attached to Cr grains in the Cu matrix in a wide range of values of the ratio of the grain radius to the radius of the spot. In the case where this ratio is close to unity, parameters of spot are strongly different from those operating on both pure-copper and pure-chromium cathodes; in particular, the spot is maintained by Joule heat generation in the cathode body and the net energy flux is directed from the cathode to the plasma and not the other way round. An investigation of stability has shown that stationary spots are stable if current controlled. However, under conditions of high power circuit breakers, where the near-cathode voltage is not affected by ignition or extinction of separate spots, the spots are unstable and end up either in explosive-like behavior or in destruction by thermal conduction. On the other hand, spots live significantly longer-up to one order of magnitude-if the spot and grain sizes are close; else, typical spot lifetimes are of the order of 10 µs. This result is very interesting theoretically and may explain the changes in grain size occurring in the beginning of the lifetime of contacts of high-power current breakers. A sensitivity study has shown that variations in different aspects of the simulation model produce quantitative changes but do not affect the results qualitatively.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBenilov, M. S., Cunha, M. D., Hartmann, W., Kosse, S., Lawall, A., & Wenzel, N. (2015). Modeling spots on composite copper-chromium contacts of vacuum arcs and their stability. IEEE Transactions on Plasma Science, 43(8), 2253-2260.pt_PT
dc.identifier.doi10.1109/TPS.2015.2412571pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4556
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherInstitute of Electrical and Electronics Engineerspt_PT
dc.relationModelling, understanding, and controlling self-organization phenomena in plasma-electrode interaction in gas discharges: from first principles to applications
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectCathode spotpt_PT
dc.subjectGrain sizept_PT
dc.subjectSpot extinctionpt_PT
dc.subjectSpot lifetimept_PT
dc.subjectStabilitypt_PT
dc.subjectVacuum circuit breakerpt_PT
dc.subjectVacuum interrupterpt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleModeling spots on composite copper-chromium contacts of vacuum arcs and their stabilitypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleModelling, understanding, and controlling self-organization phenomena in plasma-electrode interaction in gas discharges: from first principles to applications
oaire.awardTitleInstitute for Plasmas and Nuclear Fusion
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FFIS-PLA%2F2708%2F2012/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FFIS%2F50010%2F2013/PT
oaire.citation.endPage2260pt_PT
oaire.citation.issue8pt_PT
oaire.citation.startPage2253pt_PT
oaire.citation.titleIEEE Transactions on Plasma Sciencept_PT
oaire.citation.volume43pt_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.typearticlept_PT
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relation.isAuthorOfPublication8509472b-5d78-47db-bfa0-51625a4e9218
relation.isAuthorOfPublication.latestForDiscovery8509472b-5d78-47db-bfa0-51625a4e9218
relation.isProjectOfPublicationac2557f2-e637-477a-8a14-7b1f23978256
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