Thermal-fluid characterization of alternative liquids of power transformers: a numerical approach

The 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...

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Autores: Lecuna Tolosa, Ramón|||0000-0002-9977-3673, Delgado San Román, Fernando|||0000-0002-2558-3033, Ortiz Fernández, Alfredo, Castro Alonso, Pablo Bernardo, Fernández Diego, Inmaculada, Renedo Estébanez, Carlos J.
Tipo de recurso: artículo
Fecha de publicación:2015
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/9744
Acceso en línea:http://hdl.handle.net/10902/9744
Access Level:acceso abierto
Palabra clave:Dielectric liquids
Fluid-dynamics
Thermal analysis
Power transformers
Numerical analysis
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spelling Thermal-fluid characterization of alternative liquids of power transformers: a numerical approachLecuna Tolosa, Ramón|||0000-0002-9977-3673Delgado San Román, Fernando|||0000-0002-2558-3033Ortiz Fernández, AlfredoCastro Alonso, Pablo BernardoFernández Diego, InmaculadaRenedo Estébanez, Carlos J.Dielectric liquidsFluid-dynamicsThermal analysisPower transformersNumerical analysisThe 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.The 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.Institute of Electrical and Electronics EngineersUniversidad de Cantabria20152015-10-01journal articlehttp://purl.org/coar/resource_type/c_6501NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/articlehttp://hdl.handle.net/10902/9744IEEE Transactions on Dielectrics and Electrical Insulation, 2015, Vol. 22 (5), 2522-2529reponame:UCrea Repositorio Abierto de la Universidad de Cantabriainstname:Universidad de Cantabria (UC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.unican.es:10902/97442026-06-02T12:39:31Z
dc.title.none.fl_str_mv Thermal-fluid characterization of alternative liquids of power transformers: a numerical approach
title Thermal-fluid characterization of alternative liquids of power transformers: a numerical approach
spellingShingle Thermal-fluid characterization of alternative liquids of power transformers: a numerical approach
Lecuna Tolosa, Ramón|||0000-0002-9977-3673
Dielectric liquids
Fluid-dynamics
Thermal analysis
Power transformers
Numerical analysis
title_short Thermal-fluid characterization of alternative liquids of power transformers: a numerical approach
title_full Thermal-fluid characterization of alternative liquids of power transformers: a numerical approach
title_fullStr Thermal-fluid characterization of alternative liquids of power transformers: a numerical approach
title_full_unstemmed Thermal-fluid characterization of alternative liquids of power transformers: a numerical approach
title_sort Thermal-fluid characterization of alternative liquids of power transformers: a numerical approach
dc.creator.none.fl_str_mv Lecuna Tolosa, Ramón|||0000-0002-9977-3673
Delgado San Román, Fernando|||0000-0002-2558-3033
Ortiz Fernández, Alfredo
Castro Alonso, Pablo Bernardo
Fernández Diego, Inmaculada
Renedo Estébanez, Carlos J.
author Lecuna Tolosa, Ramón|||0000-0002-9977-3673
author_facet Lecuna Tolosa, Ramón|||0000-0002-9977-3673
Delgado San Román, Fernando|||0000-0002-2558-3033
Ortiz Fernández, Alfredo
Castro Alonso, Pablo Bernardo
Fernández Diego, Inmaculada
Renedo Estébanez, Carlos J.
author_role author
author2 Delgado San Román, Fernando|||0000-0002-2558-3033
Ortiz Fernández, Alfredo
Castro Alonso, Pablo Bernardo
Fernández Diego, Inmaculada
Renedo Estébanez, Carlos J.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Universidad de Cantabria
dc.subject.none.fl_str_mv Dielectric liquids
Fluid-dynamics
Thermal analysis
Power transformers
Numerical analysis
topic Dielectric liquids
Fluid-dynamics
Thermal analysis
Power transformers
Numerical analysis
description The 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.
publishDate 2015
dc.date.none.fl_str_mv 2015
2015-10-01
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10902/9744
url http://hdl.handle.net/10902/9744
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Institute of Electrical and Electronics Engineers
publisher.none.fl_str_mv Institute of Electrical and Electronics Engineers
dc.source.none.fl_str_mv IEEE Transactions on Dielectrics and Electrical Insulation, 2015, Vol. 22 (5), 2522-2529
reponame:UCrea Repositorio Abierto de la Universidad de Cantabria
instname:Universidad de Cantabria (UC)
instname_str Universidad de Cantabria (UC)
reponame_str UCrea Repositorio Abierto de la Universidad de Cantabria
collection UCrea Repositorio Abierto de la Universidad de Cantabria
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,30478

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