Contributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonics

Detalhes bibliográficos
Autor(a) principal: Danielle Cristinny Leite e Silva
Data de Publicação: 2015
Tipo de documento: Dissertação
Idioma: por
Título da fonte: Biblioteca Digital de Teses e Dissertações da UFC
Texto Completo: http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15828
Resumo: The harmonic pollution in distribution systems has increased significantly due to the widespread use of nonlinear loads. The current and voltage harmonics deteriorate the power quality supplied by feeders and compromise the efficiency of the equipments connected to the electric network. These equipments require a sinusoidal waveform to ensure its suitable functioning, as in the case of transformers. Its performance and mainly the protection depend largely of the insulation of the windings, which is closely related to the operating temperature. Concerning this, this work proposes a study on energy efficiency, whose main aim is to investigate the transformer heating in the presence of harmonics. It is presented comparative measurements between the increasing of temperature caused a 10kVA three-phase dry-type transformer when submitted to sinusoidal voltages and currents and nonsinusoidal. Later a comparison was made between experimental results and the simulations obtained from a 3D model of the same transformer developed in the software COMSOL Multiphysics. It was observed that the higher harmonic current distortion, the higher temperature at the core, and especially in the coils. While in the case of supply voltage with interharmonic and subharmonic, the impact on transformer heating become much more pronounced in relation to the cases in which their supply voltage is sinusoidal or contains harmonics of the 3rd, 5th and 7th orders. The errors checked between the measurements and the results of simulations were considered acceptable. With the refinement of the model, will be possible use it in order to predict the temperature spectrum of transformers at the begining of the design, mainly in nonlinear conditions of operation.
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spelling info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisContributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonicsContribuiÃÃes para o estudo tÃrmico em transformador a seco na presenÃa de sub e inter-harmÃnicos2015-11-20Francisco KlÃber de AraÃjo Lima34340491349Tobias Rafael Fernandes Neto64797023368Ricardo Silva Thà Pontes09189599349http://lattes.cnpq.br/1674775796751929Marcus RogÃrio de Castro58033246391 http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4794135Z602687281352Danielle Cristinny Leite e Silva Universidade Federal do CearÃPrograma de PÃs-GraduaÃÃo em Engenharia ElÃtricaUFCBRTransformador a seco TensÃo elÃtrica Efeito tÃrmico Energia - ConservaÃÃoDry-type transformer Subharmonics Interharmonics Thermal effectENGENHARIA ELETRICAThe harmonic pollution in distribution systems has increased significantly due to the widespread use of nonlinear loads. The current and voltage harmonics deteriorate the power quality supplied by feeders and compromise the efficiency of the equipments connected to the electric network. These equipments require a sinusoidal waveform to ensure its suitable functioning, as in the case of transformers. Its performance and mainly the protection depend largely of the insulation of the windings, which is closely related to the operating temperature. Concerning this, this work proposes a study on energy efficiency, whose main aim is to investigate the transformer heating in the presence of harmonics. It is presented comparative measurements between the increasing of temperature caused a 10kVA three-phase dry-type transformer when submitted to sinusoidal voltages and currents and nonsinusoidal. Later a comparison was made between experimental results and the simulations obtained from a 3D model of the same transformer developed in the software COMSOL Multiphysics. It was observed that the higher harmonic current distortion, the higher temperature at the core, and especially in the coils. While in the case of supply voltage with interharmonic and subharmonic, the impact on transformer heating become much more pronounced in relation to the cases in which their supply voltage is sinusoidal or contains harmonics of the 3rd, 5th and 7th orders. The errors checked between the measurements and the results of simulations were considered acceptable. With the refinement of the model, will be possible use it in order to predict the temperature spectrum of transformers at the begining of the design, mainly in nonlinear conditions of operation.A poluiÃÃo harmÃnica em sistemas de distribuiÃÃo tem aumentado significativamente devido ao uso generalizado de cargas nÃo lineares. HarmÃnicos de corrente e tensÃo deterioram a qualidade da energia fornecida pelos alimentadores e comprometem a eficiÃncia dos equipamentos conectados à rede elÃtrica. Estes equipamentos necessitam de uma forma de onda senoidal para garantir seu funcionamento adequado, como à o caso dos transformadores. Seu desempenho e principalmente a proteÃÃo dependem, em grande parte, do isolamento dos enrolamentos, o qual està intimamente relacionado com a temperatura de operaÃÃo. Concernente a isso, este trabalho propÃe um estudo sobre eficiÃncia energÃtica, cujo principal objetivo à investigar o aquecimento do transformador na presenÃa de harmÃnicos, apresentando mediÃÃes comparativas entre o aumento da temperatura causada em um transformador a seco trifÃsico de 10~kVA quando submetido a correntes e tensÃes senoidais e nÃo senoidais, e, posteriormente, uma comparaÃÃo entre os resultados experimentais e os de simulaÃÃes obtidas a partir de um modelo 3D do mesmo transformador desenvolvido no emph{software} COMSOL emph{Multiphysics}. Verificou-se que quanto maior a distorÃÃo harmÃnica de corrente, mais elevada à a temperatura no nÃcleo, e sobretudo nas bobinas. Enquanto que para tensÃo de alimentaÃÃo com inter-harmÃnico e sub-harmÃnico o impacto no aquecimento do transformador tornou-se bem mais acentuado em relaÃÃo a casos nos quais sua tensÃo de alimentaÃÃo à senoidal ou contÃm harmÃnicas de 3Â, 5 e 7 ordens. Os erros verificados entre as mediÃÃes e os resultados de simulaÃÃes foram considerados aceitÃveis. Com o refinamento do modelo, serà possÃvel empregÃ-lo a fim de prever o espectro de temperatura de transformadores em fase de projeto, principalmente sob condiÃÃes nÃo lineares de operaÃÃo.FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgicohttp://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15828application/pdfinfo:eu-repo/semantics/openAccessporreponame:Biblioteca Digital de Teses e Dissertações da UFCinstname:Universidade Federal do Cearáinstacron:UFC2019-01-21T11:29:05Zmail@mail.com -
dc.title.en.fl_str_mv Contributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonics
dc.title.alternative.pt.fl_str_mv ContribuiÃÃes para o estudo tÃrmico em transformador a seco na presenÃa de sub e inter-harmÃnicos
title Contributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonics
spellingShingle Contributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonics
Danielle Cristinny Leite e Silva
Transformador a seco
TensÃo elÃtrica
Efeito tÃrmico
Energia - ConservaÃÃo
Dry-type transformer
Subharmonics
Interharmonics
Thermal effect
ENGENHARIA ELETRICA
title_short Contributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonics
title_full Contributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonics
title_fullStr Contributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonics
title_full_unstemmed Contributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonics
title_sort Contributions to the study thermal in dry-type transformer in the presence of sub and inter-harmonics
author Danielle Cristinny Leite e Silva
author_facet Danielle Cristinny Leite e Silva
author_role author
dc.contributor.advisor1.fl_str_mv Francisco KlÃber de AraÃjo Lima
dc.contributor.advisor1ID.fl_str_mv 34340491349
dc.contributor.referee1.fl_str_mv Tobias Rafael Fernandes Neto
dc.contributor.referee1ID.fl_str_mv 64797023368
dc.contributor.referee2.fl_str_mv Ricardo Silva Thà Pontes
dc.contributor.referee2ID.fl_str_mv 09189599349
dc.contributor.referee2Lattes.fl_str_mv http://lattes.cnpq.br/1674775796751929
dc.contributor.referee3.fl_str_mv Marcus RogÃrio de Castro
dc.contributor.referee3ID.fl_str_mv 58033246391
dc.contributor.referee3Lattes.fl_str_mv http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4794135Z6
dc.contributor.authorID.fl_str_mv 02687281352
dc.contributor.author.fl_str_mv Danielle Cristinny Leite e Silva
contributor_str_mv Francisco KlÃber de AraÃjo Lima
Tobias Rafael Fernandes Neto
Ricardo Silva Thà Pontes
Marcus RogÃrio de Castro
dc.subject.por.fl_str_mv Transformador a seco
TensÃo elÃtrica
Efeito tÃrmico
Energia - ConservaÃÃo
topic Transformador a seco
TensÃo elÃtrica
Efeito tÃrmico
Energia - ConservaÃÃo
Dry-type transformer
Subharmonics
Interharmonics
Thermal effect
ENGENHARIA ELETRICA
dc.subject.eng.fl_str_mv Dry-type transformer
Subharmonics
Interharmonics
Thermal effect
dc.subject.cnpq.fl_str_mv ENGENHARIA ELETRICA
dc.description.sponsorship.fl_txt_mv FundaÃÃo Cearense de Apoio ao Desenvolvimento Cientifico e TecnolÃgico
dc.description.abstract.por.fl_txt_mv The harmonic pollution in distribution systems has increased significantly due to the widespread use of nonlinear loads. The current and voltage harmonics deteriorate the power quality supplied by feeders and compromise the efficiency of the equipments connected to the electric network. These equipments require a sinusoidal waveform to ensure its suitable functioning, as in the case of transformers. Its performance and mainly the protection depend largely of the insulation of the windings, which is closely related to the operating temperature. Concerning this, this work proposes a study on energy efficiency, whose main aim is to investigate the transformer heating in the presence of harmonics. It is presented comparative measurements between the increasing of temperature caused a 10kVA three-phase dry-type transformer when submitted to sinusoidal voltages and currents and nonsinusoidal. Later a comparison was made between experimental results and the simulations obtained from a 3D model of the same transformer developed in the software COMSOL Multiphysics. It was observed that the higher harmonic current distortion, the higher temperature at the core, and especially in the coils. While in the case of supply voltage with interharmonic and subharmonic, the impact on transformer heating become much more pronounced in relation to the cases in which their supply voltage is sinusoidal or contains harmonics of the 3rd, 5th and 7th orders. The errors checked between the measurements and the results of simulations were considered acceptable. With the refinement of the model, will be possible use it in order to predict the temperature spectrum of transformers at the begining of the design, mainly in nonlinear conditions of operation.
A poluiÃÃo harmÃnica em sistemas de distribuiÃÃo tem aumentado significativamente devido ao uso generalizado de cargas nÃo lineares. HarmÃnicos de corrente e tensÃo deterioram a qualidade da energia fornecida pelos alimentadores e comprometem a eficiÃncia dos equipamentos conectados à rede elÃtrica. Estes equipamentos necessitam de uma forma de onda senoidal para garantir seu funcionamento adequado, como à o caso dos transformadores. Seu desempenho e principalmente a proteÃÃo dependem, em grande parte, do isolamento dos enrolamentos, o qual està intimamente relacionado com a temperatura de operaÃÃo. Concernente a isso, este trabalho propÃe um estudo sobre eficiÃncia energÃtica, cujo principal objetivo à investigar o aquecimento do transformador na presenÃa de harmÃnicos, apresentando mediÃÃes comparativas entre o aumento da temperatura causada em um transformador a seco trifÃsico de 10~kVA quando submetido a correntes e tensÃes senoidais e nÃo senoidais, e, posteriormente, uma comparaÃÃo entre os resultados experimentais e os de simulaÃÃes obtidas a partir de um modelo 3D do mesmo transformador desenvolvido no emph{software} COMSOL emph{Multiphysics}. Verificou-se que quanto maior a distorÃÃo harmÃnica de corrente, mais elevada à a temperatura no nÃcleo, e sobretudo nas bobinas. Enquanto que para tensÃo de alimentaÃÃo com inter-harmÃnico e sub-harmÃnico o impacto no aquecimento do transformador tornou-se bem mais acentuado em relaÃÃo a casos nos quais sua tensÃo de alimentaÃÃo à senoidal ou contÃm harmÃnicas de 3Â, 5 e 7 ordens. Os erros verificados entre as mediÃÃes e os resultados de simulaÃÃes foram considerados aceitÃveis. Com o refinamento do modelo, serà possÃvel empregÃ-lo a fim de prever o espectro de temperatura de transformadores em fase de projeto, principalmente sob condiÃÃes nÃo lineares de operaÃÃo.
description The harmonic pollution in distribution systems has increased significantly due to the widespread use of nonlinear loads. The current and voltage harmonics deteriorate the power quality supplied by feeders and compromise the efficiency of the equipments connected to the electric network. These equipments require a sinusoidal waveform to ensure its suitable functioning, as in the case of transformers. Its performance and mainly the protection depend largely of the insulation of the windings, which is closely related to the operating temperature. Concerning this, this work proposes a study on energy efficiency, whose main aim is to investigate the transformer heating in the presence of harmonics. It is presented comparative measurements between the increasing of temperature caused a 10kVA three-phase dry-type transformer when submitted to sinusoidal voltages and currents and nonsinusoidal. Later a comparison was made between experimental results and the simulations obtained from a 3D model of the same transformer developed in the software COMSOL Multiphysics. It was observed that the higher harmonic current distortion, the higher temperature at the core, and especially in the coils. While in the case of supply voltage with interharmonic and subharmonic, the impact on transformer heating become much more pronounced in relation to the cases in which their supply voltage is sinusoidal or contains harmonics of the 3rd, 5th and 7th orders. The errors checked between the measurements and the results of simulations were considered acceptable. With the refinement of the model, will be possible use it in order to predict the temperature spectrum of transformers at the begining of the design, mainly in nonlinear conditions of operation.
publishDate 2015
dc.date.issued.fl_str_mv 2015-11-20
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/masterThesis
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dc.identifier.uri.fl_str_mv http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=15828
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dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Universidade Federal do CearÃ
dc.publisher.program.fl_str_mv Programa de PÃs-GraduaÃÃo em Engenharia ElÃtrica
dc.publisher.initials.fl_str_mv UFC
dc.publisher.country.fl_str_mv BR
publisher.none.fl_str_mv Universidade Federal do CearÃ
dc.source.none.fl_str_mv reponame:Biblioteca Digital de Teses e Dissertações da UFC
instname:Universidade Federal do Ceará
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instname_str Universidade Federal do Ceará
instacron_str UFC
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