Investigation on Ageing Parameters of a Thermally Accelerated Aged Paper-Oil-Insulation in a Hermetically Sealed System

Münster, T.; Kinkeldey, T.; Werle, Peter; Hämel, Kai; Preusel, J.

doi:10.1109/cmd.2018.8535626

Cited by 8 publications

(4 citation statements)

References 7 publications

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“…The oils are the non-inhibited Oil A and the inhibited Oil B with a mineral oil base. Furthermore, the oil of the newest generation Oil C is used, which is obtained from natural gas [28][29][30]. The used esters are the synthetic ester Ester A and the natural esters Ester B and Ester C, which are based on rapeseed oil and soybean oil [31].…”

Section: Samplesmentioning

confidence: 99%

“…The used esters are the synthetic ester Ester A and the natural esters Ester B and Ester C, which are based on rapeseed oil and soybean oil [31]. This contribution provides a deeper study as well as a detailed review of a first series of investigations in which aging behavior was performed in a hermetic and free-breathing transformer using Oil A, B, and C [28,29] and a second series of investigations in which a hermetic transformer was replicated using Ester A, B, and C [31].…”

Section: Samplesmentioning

confidence: 99%

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Thermally Accelerated Aging of Insulation Paper for Transformers with Different Insulating Liquids

Münster

Werle

Hämel³

et al. 2021

Energies

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The article presents issues related to the aging behavior of oil-paper insulations in transformers using different oil- and ester-based insulating fluids. Despite numerous conducted studies on the subject of oil-paper aging, the use of new insulating fluids is creating open questions. In addition, new liquids such as synthetic and natural esters, as well as oil of the newest generation, are being used. Furthermore, there is still little research on the formation of aging markers with this form of the dielectric. For this reason, in this contribution, oil-paper insulations with mineral oil-based insulating fluids, natural and synthetic esters, as well as oil from natural gas, are aged thermally accelerated at 130 °C over a duration of 15 weeks, by considering two cases of free-breathing and hermetically sealed transformers. Therefore, various aging markers are investigated to allow a condition assessment. The results show that differences exist between the fluids and design of the transformer, as in the aging rate of the paper and the formation of aging markers in the insulating liquid such as acids. These findings can be used to improve asset management strategies by a more precise determination of the aging state depending on the transformer type as well as the type of insulating fluid.

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Section: Samplesmentioning

confidence: 99%

Section: Samplesmentioning

confidence: 99%

Thermally Accelerated Aging of Insulation Paper for Transformers with Different Insulating Liquids

Münster

Werle

Hämel³

et al. 2021

Energies

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“…De acordo com as estatísticas, falhas do transformador causadas pelo envelhecimento do isolamento interno são responsáveis por uma parte significativa dos acidentes com transformadores. Portanto, é essencial investigar as características de envelhecimento do sistema de isolamento com o objetivo de uma avaliação de vida melhorada (MÜNSTER et al, 2018).…”

Section: Influências No Prazo De Vida Do Papel De Isolamentounclassified

“…O envelhecimento de papel isolante, que consiste de celulose, é caracterizado pelo grau de polimerização (GP), o número médio de monômeros de glicose nas cadeias poliméricas de celulose (MÜNSTER et al, 2018). Normalmente, considera-se que o fim da vida útil dos transformadores é alcançado quando o GP do papel cai para um valor de 200, e sua resistência à tração é de aproximadamente 40 % de seu valor inicial.…”

Section: Influências No Prazo De Vida Do Papel De Isolamentounclassified

Uma nova abordagem para estimação de grau de polimerização em transformadores de força utilizando aprendizagem de máquina

Fehlberg

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O principal indicador utilizado para avaliar o estado da isolação sólida em equipamentos de potência atualmente é o grau de polimerização (GP), medido por um ensaio que necessita de uma amostra de papel da parte ativa. Sendo este um ensaio invasivo, outros subprodutos do envelhecimento são utilizados para estimar o GP, como o 2-fal. Este trabalho apresenta um estudo sistemático onde técnicas de machine learning são utilizadas para estimar o GP a partir do 2-fal, da relação CO 2 /CO e de outros indicadores. Os resultados são promissores, indicando que 2-fal, CO 2 /CO, a fórmula de Chendong e a potência do equipamento podem ser utilizados em conjunto para melhor previsão do valor atual do GP do papel, logo, da sua vida útil.

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Comparison of a Thermally Accelerated Aged Oil-Paper Insulation of an Open and Hermetically Sealed System

Münster

Kinkeldey

Werle

et al. 2019

Lecture Notes in Electrical Engineering

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Investigation on Ageing Parameters of a Thermally Accelerated Aged Paper-Oil-Insulation in a Hermetically Sealed System

Cited by 8 publications

References 7 publications

Thermally Accelerated Aging of Insulation Paper for Transformers with Different Insulating Liquids

Thermally Accelerated Aging of Insulation Paper for Transformers with Different Insulating Liquids

Uma nova abordagem para estimação de grau de polimerização em transformadores de força utilizando aprendizagem de máquina

Comparison of a Thermally Accelerated Aged Oil-Paper Insulation of an Open and Hermetically Sealed System

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