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A simple model of distribution of current over cathodes of vacuum circuit breakers

2019Journal article Open access
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dc.contributor.authorCunha, Mário D.
dc.contributor.authorWenzel, Norbert
dc.contributor.authorAlmeida, Pedro G. C.
dc.contributor.authorHartmann, Werner
dc.contributor.authorBenilov, Mikhail S.
dc.date.accessioned2022-07-13T10:15:57Z
dc.date.available2022-07-13T10:15:57Z
dc.date.issued2019
dc.description.abstractThere are several hundreds of spots operating simultaneously on cathodes of vacuum arcs in high-power vac uum circuit breakers. In this work, the spot distribution along the contact surface is simulated by means of an approach that is based on the concept of surface density of spots and represents a natural alternative to tracing individual spots. An equation governing the evolution of the surface density of the spots or, equivalently, the distribution of macroscopic (averaged over individual spots) current density over the cathode is obtained by generalizing the concept of random walk of a single cathode spot in low-current vacuum arcs. The model relies on empirical parameters characterizing individual spots (the diffusion coefficient of the random motion of cathode spots and the velocity of drift superimposed over the random motion), which may be taken from experiments with low-current arcs, and does not involve adjustable parameters. The model is simple and physically transparent and correctly reproduces the trends observed in the experiments under conditions where the cathode arc attachment is diffuse. The distribution of the macroscopic current density on the cathode, given by the model, represents the boundary condition that is required for existing numerical models of vacuum arcs in high-power vacuum circuit breakers.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationCunha, M. D., Wenzel, N., Almeida, P. G., Hartmann, W., & Benilov, M. S. (2019). A simple model of distribution of current over cathodes of vacuum circuit breakers. IEEE Transactions on Plasma Science, 47(8), 3462-3469.pt_PT
dc.identifier.doi10.1109/TPS.2019.2927794pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/4401
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherInstitute of Electrical and Electronics Engineerspt_PT
dc.relationInstitute for Plasmas and Nuclear Fusion
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectPropagationpt_PT
dc.subjectVacuum arcspt_PT
dc.subjectVacuum circuit breakerspt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências Exatas e da Engenhariapt_PT
dc.titleA simple model of distribution of current over cathodes of vacuum circuit breakerspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleInstitute for Plasmas and Nuclear Fusion
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FFIS%2F50010%2F2019/PT
oaire.citation.endPage3469pt_PT
oaire.citation.issue8pt_PT
oaire.citation.startPage3462pt_PT
oaire.citation.titleIEEE Transactions on Plasma Sciencept_PT
oaire.citation.volume47pt_PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameCunha
person.familyNameAlmeida
person.familyNameBenilov
person.givenNameMário
person.givenNamePedro G C
person.givenNameMikhail
person.identifier.ciencia-idD61F-B90C-70B2
person.identifier.ciencia-id0F14-A79A-97C1
person.identifier.orcid0000-0002-0397-536X
person.identifier.orcid0000-0002-8395-2693
person.identifier.orcid0000-0001-9059-1948
person.identifier.ridK-4443-2015
person.identifier.scopus-author-id7102711276
person.identifier.scopus-author-id8157100900
person.identifier.scopus-author-id7005138676
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication8509472b-5d78-47db-bfa0-51625a4e9218
relation.isAuthorOfPublicationc7346266-fe94-40ae-aa95-b576b0e1f3a6
relation.isAuthorOfPublication5ccf95a3-53d5-446c-857c-55d64b887175
relation.isAuthorOfPublication.latestForDiscovery8509472b-5d78-47db-bfa0-51625a4e9218
relation.isProjectOfPublication1b3181b8-31b9-41ee-97dd-da48b59b5f9c
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