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Study on the contamination rate of mineral oil in natural-ester retrofilled transformers

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URI: https://hdl.handle.net/10016/38646
ISSN: 1070-9878
DOI: https://doi.org/10.1109/TDEI.2023.3298314
UXXI: AR/0000033438
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Study_IEEE-TDEI_2023_ps.pdf (5.28 MB)
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2023-08
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IEEE
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Abstract
The replacement of mineral oil (MO) by ester (retrofilling) is a practice used in power transformers to reduce fire and environmental risk. Although measures are taken to remove traces of oil on the paper, a certain amount of MO remains, which migrates over time. This article presents a study to evaluate the migration of MO from paper to ester using techniques such as the iodine value or the measurement of permittivity and dielectric losses.
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Contamination rate, Dielectric response, Iodine index, Kraft paper, Natural ester (NE), Oil-paper insulation, Relative permittivity, Retrofilled transformer
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Montero, A., García, B., & Burgos, J. C. (2023). Study on the contamination rate of mineral oil in Natural-Ester Retrofilled transformers. IEEE Transactions on Dielectrics and Electrical Insulation, 30(4), 1641-1648.
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