Bubble Effect Phenomenon in Modern Transformer Insulation Systems Using Aramid-Based Materials and Alternative Insulating Liquids

Kamil Lewandowski, Hubert Moranda () and Radoslaw Szewczyk
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Kamil Lewandowski: Institute of Electric Power Engineering, Poznan University of Technology, Piotrowo 3A Str., 61-138 Poznan, Poland
Hubert Moranda: Institute of Electric Power Engineering, Poznan University of Technology, Piotrowo 3A Str., 61-138 Poznan, Poland
Radoslaw Szewczyk: DuPont Polska Sp. z o.o., Al. Jerozolimskie 93, 02-001 Warszawa, Poland

Energies, 2023, vol. 16, issue 14, 1-15

Abstract: One of the possible causes of transformer failures is high moisture in the winding insulation system. In an extreme case, when the critical temperature is exceeded, a sudden release of water vapor from the transformer insulation, called the bubble effect, can occur. This article analyzes the initiation temperature of the bubble phenomenon in various solid insulation materials (Kraft cellulose paper and aramid-based high-temperature papers such as Nomex ® 910 and Nomex ® 926) immersed in two electro-insulating liquids (mineral oil and Midel 7131 synthetic ester). The initiation temperature of the bubble effect depends mainly on the moisture content of the solid insulation, but it was found to be slightly lower for high-temperature materials than for cellulose. However, after taking into account the differences related to uneven water absorption of the tested materials, the differences in the initiation temperature of individual solid materials are very small. Synthetic ester, compared to mineral oil, slightly increases the bubble initiation temperature, regardless of the solid material used.

Keywords: bubble effect; aramid insulation; high temperature insulation; power transformers; synthetic ester (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: 2023
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