Two Decades of Experience and Progress in Epoxy Mica Insulation Systems For Large Rotating Machines

Wichmann, A.

doi:10.1109/tpas.1983.318000

Cited by 21 publications

(7 citation statements)

References 5 publications

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“…the saturation was not, however, accurately defined, as the electrical measurements were not carried out. figures [11][12][13] show that the degradation was more severe in the imperfectly impregnated insulation systems. Insulation system g2 was impregnated poorly, and it almost completely lost its strength in the test.…”

Section: Resultsmentioning

confidence: 99%

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Fortifying Subsea Wells: A Comparative Analysis of Mainwall Insulation Materials Used in Natural Gas Production

Sihvo

Nerg

Pyrhönen

et al. 2013

IEEE Ind. Appl. Mag.

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A comparative analysis of mainwall insulation materials used in natural gas production FortiFying SubSea WellSFortiFying SubSea WellS B y v I l l E s I h v o , J A n n E n E r g , J u h A p y r h ö n E n , & l A r s B r E n n E atural gas recovery from subsea wells is increased by an artificial lift, which can be provided by a compressor installed at the wellheads. such a machine is driven by a high-speed, high-voltage electrical motor that is integrated into the same casing as the compressor. the motor is cooled by the process gas bled from the compressor itself. because the insulation system is in direct contact with the process gas, it must have good chemical resistance and high mechanical strength to withstand the environment.various types of mica-based mainwall insulations were exposed to an environment consisting of: 1) hydrocarbon gas, 2) condensate, and 3) a mixture of produced water and monoethylene glycol at 150 bar and 130 °c. changes in the mechanical properties were

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Section: Resultsmentioning

confidence: 99%

“…usually, a vacuum was applied during the curing stage. In the 1960s [12], the vacuum-pressure impregnation (vPI) process began to gain ground. In the vPI process, the coils are wrapped in dry mica tape and impregnated under a vacuum, followed by a pressure treatment.…”

Section: Mainwall Insulationmentioning

confidence: 99%

Fortifying Subsea Wells: A Comparative Analysis of Mainwall Insulation Materials Used in Natural Gas Production

Sihvo

Nerg

Pyrhönen

et al. 2013

IEEE Ind. Appl. Mag.

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“…A resina RE é utilizada desde a década de 60 até a presente data e é um material reconhecido no meio industrial por seus resultados de tempo de vida útil comprovados pelo tempo em operação [8,9] . A resina RN proposta foi obtida segundo estudos recentes desenvolvidos por Meichsner [3] , sem o uso de fita de mica, com resultados promissores de envelhecimento acelerado da ordem de um fator 10.…”

Section: Avaliação Das Propriedades Elétricas De Barras Estatóricas Funclassified

“…Uma estimativa complementar à distribuição de Weibull, comumente utilizada por fabricantes de hidrogeradores, é analisar o gráfico da rigidez dielétrica (tensão suportável por espessura de dielétrico) em função do tempo de ensaio, sendo estes colocados em escala logarítmica [1,9,22,23] . Realiza-se uma extrapolação considerando o valor de rigidez dielétrica para utilização industrial das barras estatóricas.…”

Section: Expectativa De Vida úTil Das Barras Estatóricasunclassified

Avaliação das propriedades elétricas de barras estatóricas fabricadas com resina do tipo éter diglicidílico do bisfenol F (DGEBF) contendo nanopartículas de silica

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Campos

2016

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ResumoO presente trabalho visa apresentar resultados da aplicação de uma resina epóxi bisfenólica (DGEBF) à base de nanopartículas de sílica (RN) e comparar suas propriedades com a resina convencional de referência epóxi bisfenólica (DGEBA) (RE), atualmente utilizada. Neste sentido fabricaram-se protótipos de barras estatórica, destinadas a hidrogeradores, através do sistema VPI (Vácuo-Pressão-Impregnação) e avaliaram-se as propriedades elétricas pelas técnicas de fator de dissipação e envelhecimento acelerado. Dentre os resultados para as resinas observou-se que: (i) o fator de dissipação e de envelhecimento são praticamente os mesmos para ambas as resinas; (ii) o valor de tip-up resultaram em 0,014% para RE e 0,020% para a resina RN e (iii) a estimativa do tempo de vida útil esta em cerca de 40 anos, o que é aplicável para a maioria das aplicações industriais. Neste sentido sugere-se que a resina RN pode ser uma alternativa a resina RE, com um desempenho elétrico equivalente. Palavras-chave: barras estatóricas, fita de mica, hidrogerador, nanodielétricos, nanotecnologia. AbstractThe present work aims to present the results of an application of a bisphenolic epoxy resin (DGEBF) containing silica nanoparticles (RN) and compare its properties with a bisphenolic epoxy resin (DGEBA) (RE), currently used. In this context, prototype stator bars for hydrogenerators were manufactured, according to the VPI (Vacuum-Pressure-Impregnation) system and their electrical properties with the tests of dissipation factor and voltage endurance. Within the results for the resins it was observed that: (i) dissipation factor and voltage endurance are practically the same for both resins; (ii) the resulting values of tip-up were 0.014% for RE and 0.020% for RN resin and (iii) the estimating of the life-time is about 40 years, what is suitable for most industrial applications. In this sense it is suggested that the RN resin can be an alternative to the RE resin, with an equivalent electrical performance.Keywords: stator bars, mica tape, hydrogenerator, nanodielectrics, nanotechnology. IntroduçãoA crescente demanda por energia elétrica tem pressionado fabricantes de hidrogeradores a desenvolverem máquinas menores e com maior eficiência de geração elétrica desde o início do século XX. A limitação de geração esbarra, entre outros fatores, nas propriedades e tecnologias de materiais compósitos isolantes disponíveis. A busca por novos materiais motiva pesquisadores em todo mundo a desenvolverem alternativas que possam suportar níveis de tensão elétrica acima de 3kV/mm, que é o padrão atual de rigidez dielétrica dos sistemas isolantes [1] . Estima-se que através de uma redução de 15% na espessura de isolação seria possível aumentar em 16% a seção transversal de cobre o que aumentaria a eficiência de um hidrogerador em 4% [2] .A descoberta de materiais nanocompósitos isolantes (ou nanodielétricos) em escala de laboratório, com propriedades dielétricas superiores aos convencionais, despertou o interesse de diversos segmentos da indústria com ...

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“…In consequence, insulation systems capable of functioning at relatively high electrical, mechanical and thermal stresses were made [2]- [7]. For high power machines, modern insulation systems are made of micabands consisting of mica paper, glass texture and thermorigid resins (epoxy [4], modified silicon resins [2], imidic [6] etc. ).…”

Section: Introductionmentioning

confidence: 99%

The influence of temperature and electric field frequency on the dielectric properties of electrical machines insulation systems

Busoi

Notingher

Dumitran

et al. 2010

2010 3rd International Symposium on Electrical and Electronics Engineering (ISEEE)

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Electrical machines' composite insulations conditions can be characterized by the values of the dielectric properties. In this paper, an experimental study of the variation of these properties with temperature and applied electric field frequency are presented.The tests were done on plane samples and bars containing CALMICAGLAS, made of glass texture (13 %), mica paper (47 %) and epoxy resins (40 %). After their conditioning (48 h at 190 °C), real and imaginary parts of the complex permittivity and conductivity -for electric field frequencies varying from 10 -3 to 10 6 Hz and temperatures between 30 and 90 °C -were measured using a NOVOCONTROL dielectric spectrometer.The results show important increases of the measured values with small frequency and increased temperature values. Finally, the possibility of characterizing the electrical machines insulations degradation conditions based on dielectric properties measured at low frequencies (10 -3 -10 6 Hz) is analyzed.

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Two Decades of Experience and Progress in Epoxy Mica Insulation Systems For Large Rotating Machines

Cited by 21 publications

References 5 publications

Fortifying Subsea Wells: A Comparative Analysis of Mainwall Insulation Materials Used in Natural Gas Production

Fortifying Subsea Wells: A Comparative Analysis of Mainwall Insulation Materials Used in Natural Gas Production

Avaliação das propriedades elétricas de barras estatóricas fabricadas com resina do tipo éter diglicidílico do bisfenol F (DGEBF) contendo nanopartículas de silica

The influence of temperature and electric field frequency on the dielectric properties of electrical machines insulation systems

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