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dc.contributor.authorLecuna Tolosa, Ramón 
dc.contributor.authorDelgado San Román, Fernando 
dc.contributor.authorOrtiz Fernández, Alfredo 
dc.contributor.authorCastro Alonso, Pablo Bernardo 
dc.contributor.authorFernández Diego, Inmaculada 
dc.contributor.authorRenedo Estébanez, Carlos Javier 
dc.contributor.otherUniversidad de Cantabriaes_ES
dc.date.accessioned2016-12-01T16:31:55Z
dc.date.available2016-12-01T16:31:55Z
dc.date.issued2015-10
dc.identifier.issn1558-4135
dc.identifier.issn1070-9878
dc.identifier.otherDPI2013-43897-Pes_ES
dc.identifier.urihttp://hdl.handle.net/10902/9744
dc.description.abstractThe transformers lifespan depends importantly on its refrigeration. Mineral oils perform this work in the majority of the power transformers. However, this type of coolant has two main drawbacks: low biodegradability and low ignition point. Several alternative liquids are being developed in order to overcome these drawbacks. This paper compares their thermal-fluid behavior with a mineral oil by means of several parameters, such as temperature, flow rate, fluids velocity, convective heat transfer coefficient (h) and the cooling criterion (P). These are calculated using the numerical results of the simulation of a 3D-model of a Low Voltage Winding that belongs to a power transformer with ONAN cooling. The software COMSOL Multiphysics has allowed the simulation of the geometry using a physical model in which buoyancies and viscous forces are the only considered establishing the natural convection. As a result of the comparison, it is clear that the mineral oil is the best coolant liquid. Among the alternative liquids, silicone oil would be the second best coolant fluid, followed by the synthetic and natural esters, respectively. On the other hand, it seems to be clear that the 3D simulations can be used to compare properly the cooling capacities of the liquids.es_ES
dc.description.sponsorshipThe research leading to these results has received funding from multiple sources during years but we would specifically like to acknowledge the support received in the later stages from the Spanish Plan Estatal de I+D under the grant agreement DPI2013-43897-P.es_ES
dc.format.extent8 p.es_ES
dc.language.isoenges_ES
dc.publisherInstitute of Electrical and Electronics Engineerses_ES
dc.rights© 2015 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.es_ES
dc.sourceIEEE Transactions on Dielectrics and Electrical Insulation, 2015, Vol. 22 (5), 2522-2529es_ES
dc.subject.otherDielectric liquidses_ES
dc.subject.otherFluid-dynamicses_ES
dc.subject.otherThermal analysises_ES
dc.subject.otherPower transformerses_ES
dc.subject.otherNumerical analysises_ES
dc.titleThermal-fluid characterization of alternative liquids of power transformers: a numerical approaches_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.relation.publisherVersionhttps://doi.org/10.1109/TDEI.2015.004793es_ES
dc.rights.accessRightsopenAccesses_ES
dc.identifier.DOI10.1109/TDEI.2015.004793
dc.type.versionacceptedVersiones_ES


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