Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potência
Autor(a) principal: | |
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Data de Publicação: | 2024 |
Tipo de documento: | Dissertação |
Idioma: | por |
Título da fonte: | Manancial - Repositório Digital da UFSM |
Texto Completo: | http://repositorio.ufsm.br/handle/1/31678 |
Resumo: | Power transformers play a fundamental role in the electrical power system, ensuring continuity of electrical energy supply. The quality of your insulation system is a critical factor, as it directly influences the continuous operation of the transformer, as well as its cost. Traditionally, transformers used solid cellulose and mineral oil insulation, but the thermal limitations of these materials motivated the search for alternatives. Aramid-based high-temperature synthetic materials gained prominence, surpassing cellulosic insulation. In this context, this study presents a series of dielectric tests conducted in a laboratory environment, using DuPont’s Nomex® 910 and Nomex® 994 PSB, immersed in natural ester (NE) and mineral oil (OM). Two test methodologies were adopted: Creep Breakdown (CB), which evaluates electrical stresses in insulating cylinders and insulation outputs due to distorted electrical fields, and Turn-to-turn (T2T), which analyzes the electrical stress existing between turns and adjacent coil discs. The application of test voltages followed ASTM D3426, related to standardized atmospheric impulses, and ASTM D149, related to AC voltage rise. The statistical analysis of the data was based on the Weibull distribution, allowing for a comparison between the studied synthetic insulators and the traditional thermally stabilized kraft paper (TUK). The breakdown test results confirmed that the dielectric strength of TUK in EN is comparable to that in OM. Similar behavior was observed for the Nomex® 910 insulator, whose interactions between the paper/oil interfaces are distinct from those of TUK. In both methodologies, the breakdowns of Nomex® were more violent, releasing a considerable amount of suspended residues into the oil. Overall, even though aramid-based insulators exhibit superior thermal characteristics, their dielectric performances did not demonstrate competitive advantages. This, combined with the higher cost, becomes a barrier to the adoption of these materials on a large scale. |
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Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potênciaComparative study of the dielectric strength of cellulose and aramid-based solid insulators for application in power transformersDescarga superficialDistribuição de WeibullEnsaios dielétricosEster naturalNomex®Creep dischargeWeibull distributionDielectric testsNatural esterCNPQ::ENGENHARIAS::ENGENHARIA ELETRICAPower transformers play a fundamental role in the electrical power system, ensuring continuity of electrical energy supply. The quality of your insulation system is a critical factor, as it directly influences the continuous operation of the transformer, as well as its cost. Traditionally, transformers used solid cellulose and mineral oil insulation, but the thermal limitations of these materials motivated the search for alternatives. Aramid-based high-temperature synthetic materials gained prominence, surpassing cellulosic insulation. In this context, this study presents a series of dielectric tests conducted in a laboratory environment, using DuPont’s Nomex® 910 and Nomex® 994 PSB, immersed in natural ester (NE) and mineral oil (OM). Two test methodologies were adopted: Creep Breakdown (CB), which evaluates electrical stresses in insulating cylinders and insulation outputs due to distorted electrical fields, and Turn-to-turn (T2T), which analyzes the electrical stress existing between turns and adjacent coil discs. The application of test voltages followed ASTM D3426, related to standardized atmospheric impulses, and ASTM D149, related to AC voltage rise. The statistical analysis of the data was based on the Weibull distribution, allowing for a comparison between the studied synthetic insulators and the traditional thermally stabilized kraft paper (TUK). The breakdown test results confirmed that the dielectric strength of TUK in EN is comparable to that in OM. Similar behavior was observed for the Nomex® 910 insulator, whose interactions between the paper/oil interfaces are distinct from those of TUK. In both methodologies, the breakdowns of Nomex® were more violent, releasing a considerable amount of suspended residues into the oil. Overall, even though aramid-based insulators exhibit superior thermal characteristics, their dielectric performances did not demonstrate competitive advantages. This, combined with the higher cost, becomes a barrier to the adoption of these materials on a large scale.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - CAPESTransformadores de potência desempenham um papel fundamental no sistema elétrico de potência, garantindo a continuidade do fornecimento de energia elétrica. A qualidade de seu sistema de isolação é um fator crítico, pois influencia diretamente a operação contínua do transformador, bem como seu custo. Tradicionalmente, os transformadores utilizavam isolamento sólido de celulose e óleo mineral, mas as limitações térmicas desses materiais motivaram a busca por alternativas. Materiais sintéticos de alta temperatura à base de aramida ganharam destaque, superando os isolantes celulósicos. Neste contexto, este estudo apresenta uma série de ensaios dielétricos conduzidos em ambiente laboratorial, utilizando o Nomex® 910 e o Nomex® 994 PSB da DuPont, imersos em ester natural (EN) e óleo mineral (OM). Duas metodologias de ensaios foram adotadas: Creep Breakdown (CB), que avalia estresses elétricos tangencial a cilindros isolantes e saídas de isolação devido a campos elétricos disformes, e Turn-to-turn (T2T), que analisa o estresses elétricos existente entre espiras e discos adjacentes de bobinas. A aplicação das tensões de ensaio seguiu as normas ASTM D3426, relacionada a impulsos atmosféricos padronizados, e a ASTM D149, relacionada a elevação de tensão CA. A análise estatística dos dados baseou-se na distribuição de Weibull, permitindo a comparação entre os isolantes sintéticos estudados com o tradicional papel kraft termoestabilizado (TUK). Os resultados dos testes de disruptura confirmaram que a suportabilidade do TUK em EN é comparável àquela em OM. O mesmo comportamento foi observado para o isolante Nomex® 910, cujas interações entre as interfaces papel/óleo são bem distintas do TUK. Em ambas as metodologias, as disrupturas do Nomex® foram mais violentas/abruptas, liberando uma quantidade considerável de resídios em suspensão no óleo. De maneira geral, mesmo que os isolantes à base de aramida apresentem características térmicas superiores, seus desempenhos dielétricos não demonstraram vantagens competitivas. Isso, somado ao custo mais elevado, torna-se uma barreira para a adoção desses materiais em larga escala.Universidade Federal de Santa MariaBrasilEngenharia ElétricaUFSMPrograma de Pós-Graduação em Engenharia ElétricaCentro de TecnologiaMarchesan, Tiago Bandeirahttp://lattes.cnpq.br/2318413245910780Bender, Vitor CristianoPissolato Filho, JoséBeltrame, Rafael ConcattoContri, Marcelo Weber2024-03-12T19:13:55Z2024-03-12T19:13:55Z2024-02-15info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/masterThesisapplication/pdfhttp://repositorio.ufsm.br/handle/1/31678porAttribution-NonCommercial-NoDerivatives 4.0 Internationalhttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessreponame:Manancial - Repositório Digital da UFSMinstname:Universidade Federal de Santa Maria (UFSM)instacron:UFSM2024-03-12T19:13:55Zoai:repositorio.ufsm.br:1/31678Biblioteca Digital de Teses e Dissertaçõeshttps://repositorio.ufsm.br/ONGhttps://repositorio.ufsm.br/oai/requestatendimento.sib@ufsm.br||tedebc@gmail.comopendoar:2024-03-12T19:13:55Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM)false |
dc.title.none.fl_str_mv |
Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potência Comparative study of the dielectric strength of cellulose and aramid-based solid insulators for application in power transformers |
title |
Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potência |
spellingShingle |
Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potência Contri, Marcelo Weber Descarga superficial Distribuição de Weibull Ensaios dielétricos Ester natural Nomex® Creep discharge Weibull distribution Dielectric tests Natural ester CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
title_short |
Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potência |
title_full |
Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potência |
title_fullStr |
Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potência |
title_full_unstemmed |
Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potência |
title_sort |
Estudo comparativo da suportabilidade dielétrica de isolantes sólidos a base de celulose e aramida para aplicação em transformadores de potência |
author |
Contri, Marcelo Weber |
author_facet |
Contri, Marcelo Weber |
author_role |
author |
dc.contributor.none.fl_str_mv |
Marchesan, Tiago Bandeira http://lattes.cnpq.br/2318413245910780 Bender, Vitor Cristiano Pissolato Filho, José Beltrame, Rafael Concatto |
dc.contributor.author.fl_str_mv |
Contri, Marcelo Weber |
dc.subject.por.fl_str_mv |
Descarga superficial Distribuição de Weibull Ensaios dielétricos Ester natural Nomex® Creep discharge Weibull distribution Dielectric tests Natural ester CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
topic |
Descarga superficial Distribuição de Weibull Ensaios dielétricos Ester natural Nomex® Creep discharge Weibull distribution Dielectric tests Natural ester CNPQ::ENGENHARIAS::ENGENHARIA ELETRICA |
description |
Power transformers play a fundamental role in the electrical power system, ensuring continuity of electrical energy supply. The quality of your insulation system is a critical factor, as it directly influences the continuous operation of the transformer, as well as its cost. Traditionally, transformers used solid cellulose and mineral oil insulation, but the thermal limitations of these materials motivated the search for alternatives. Aramid-based high-temperature synthetic materials gained prominence, surpassing cellulosic insulation. In this context, this study presents a series of dielectric tests conducted in a laboratory environment, using DuPont’s Nomex® 910 and Nomex® 994 PSB, immersed in natural ester (NE) and mineral oil (OM). Two test methodologies were adopted: Creep Breakdown (CB), which evaluates electrical stresses in insulating cylinders and insulation outputs due to distorted electrical fields, and Turn-to-turn (T2T), which analyzes the electrical stress existing between turns and adjacent coil discs. The application of test voltages followed ASTM D3426, related to standardized atmospheric impulses, and ASTM D149, related to AC voltage rise. The statistical analysis of the data was based on the Weibull distribution, allowing for a comparison between the studied synthetic insulators and the traditional thermally stabilized kraft paper (TUK). The breakdown test results confirmed that the dielectric strength of TUK in EN is comparable to that in OM. Similar behavior was observed for the Nomex® 910 insulator, whose interactions between the paper/oil interfaces are distinct from those of TUK. In both methodologies, the breakdowns of Nomex® were more violent, releasing a considerable amount of suspended residues into the oil. Overall, even though aramid-based insulators exhibit superior thermal characteristics, their dielectric performances did not demonstrate competitive advantages. This, combined with the higher cost, becomes a barrier to the adoption of these materials on a large scale. |
publishDate |
2024 |
dc.date.none.fl_str_mv |
2024-03-12T19:13:55Z 2024-03-12T19:13:55Z 2024-02-15 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/masterThesis |
format |
masterThesis |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://repositorio.ufsm.br/handle/1/31678 |
url |
http://repositorio.ufsm.br/handle/1/31678 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.rights.driver.fl_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/ |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Engenharia Elétrica UFSM Programa de Pós-Graduação em Engenharia Elétrica Centro de Tecnologia |
publisher.none.fl_str_mv |
Universidade Federal de Santa Maria Brasil Engenharia Elétrica UFSM Programa de Pós-Graduação em Engenharia Elétrica Centro de Tecnologia |
dc.source.none.fl_str_mv |
reponame:Manancial - Repositório Digital da UFSM instname:Universidade Federal de Santa Maria (UFSM) instacron:UFSM |
instname_str |
Universidade Federal de Santa Maria (UFSM) |
instacron_str |
UFSM |
institution |
UFSM |
reponame_str |
Manancial - Repositório Digital da UFSM |
collection |
Manancial - Repositório Digital da UFSM |
repository.name.fl_str_mv |
Manancial - Repositório Digital da UFSM - Universidade Federal de Santa Maria (UFSM) |
repository.mail.fl_str_mv |
atendimento.sib@ufsm.br||tedebc@gmail.com |
_version_ |
1805922149779636224 |