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

Tobias Münster, Peter Werle, Kai Hämel and Jörg Preusel
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Tobias Münster: Division of High Voltage Engineering and Asset Management, Institute of Electrical Power Systems, Leibniz Universität Hannover, 30167 Hannover, Germany
Peter Werle: Division of High Voltage Engineering and Asset Management, Institute of Electrical Power Systems, Leibniz Universität Hannover, 30167 Hannover, Germany
Kai Hämel: GRIDINSPECT GmbH, Mühlhof 3a, 36325 Feldatal, Germany
Jörg Preusel: GRIDINSPECT GmbH, Mühlhof 3a, 36325 Feldatal, Germany

Energies, 2021, vol. 14, issue 11, 1-28

Abstract: 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.

Keywords: transformer; oil-paper; degree of polymerization; mineral oil; natural ester; synthetic ester; aging; thermal stress (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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