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Application of 2D linear modeling for computing zero-sequence short-circuit impedances of 3-phase core-type YNynd transformers

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dc.affiliation.dptoUC3M. Departamento de Ingeniería Eléctricaes
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Diagnóstico de Máquinas Eléctricas y Materiales Aislantes (DIAMAT)es
dc.contributor.authorSorrentino, Elmer
dc.contributor.authorBurgos Díaz, Juan Carlos
dc.date.accessioned2024-02-06T15:51:01Z
dc.date.available2024-02-06T15:51:01Z
dc.date.issued2015-05-01
dc.description.abstractThis paper shows the application of 2D linear modeling for computing zero-sequence short-circuit impedances (Z(osc)) of 3-phase core-type YNynd transformers. Firstly, a basic description of these impedances is shown. The proposed 2D model is based on two steps: (a) the search of the currents to satisfy the condition of induced voltage equal to zero in short-circuited windings; (b) the use of constants (K-x and K-p) to approximate 2D results to results of real 3D geometries. K-x is related to the computed reactances, and K-p is related to the computed values for the power losses during Z(osc) tests. Induced currents in short-circuited windings are found by an iterative process, in order to apply constant current densities in the model of each winding. Results of the model are accurate in comparison with measured values in five transformers. Tertiary is the innermost winding in four units, and the outermost winding in one unit. Open-delta cases and closed-delta cases are considered, as well as cases with and without magnetic shunts on the tank walls. Equivalent permeability of tank steel has an influence on results but a reasonable accuracy is obtained with an intermediate value of this parameter; thus, non-linearity is not a concern in this case. A good accuracy is also obtained for a wide range of K-x and K-p; in fact, reactances can be estimated without considering that 2D geometry is not an exact representation of real 3D geometry (unlike power losses during the tests, where this fact must be taken into account).en
dc.format.extent9
dc.identifier.bibliographicCitationSorrentino, Elmer, Carlos Burgos, Juan. (2015). Application of 2D linear modeling for computing zero-sequence short-circuit impedances of 3-phase core-type YNynd transformers. Electric Power Systems Research 122, (May 2015), Pages 1-9. https://doi.org/10.1016/j.epsr.2014.12.017en
dc.identifier.doihttps://doi.org/10.1016/j.epsr.2014.12.017
dc.identifier.issn0378-7796
dc.identifier.publicationfirstpage1
dc.identifier.publicationissueMayen
dc.identifier.publicationlastpage9
dc.identifier.publicationtitleElectric Power Systems Researchen
dc.identifier.publicationvolume122
dc.identifier.urihttps://hdl.handle.net/10016/39892
dc.identifier.uxxiAR/0000016616
dc.language.isoengen
dc.publisherElsevieren
dc.rights© 2015 Elsevier B.V. All rights reserved.en
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.accessRightsopen accessen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.subject.ecienciaElectrónicaes
dc.subject.otherTransformer zero-sequence impedancesen
dc.subject.other3-Phase 3-limb transformersen
dc.subject.otherZero-sequence short-circuit impedancesen
dc.subject.otherTransformer modellingen
dc.subject.otherZero-sequence magnetic fields In transformersen
dc.subject.other3-phase core-type transformersen
dc.titleApplication of 2D linear modeling for computing zero-sequence short-circuit impedances of 3-phase core-type YNynd transformersen
dc.typeresearch articleen
dc.type.hasVersionAMen
dspace.entity.typePublication
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