Investigation on the Ageing Behaviour of Ester Impregnated Insulating Paper in a Hermetically Sealed System

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

doi:10.1109/ceidp47102.2019.9010546

Cited by 1 publication

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“…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]. 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%

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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