Electrical aging of insulation oils
Electrical aging of insulation oils
In this investigation we have carried out a comparative electrical aging study of a natural ester, a synthetic ester, a bio-sourced hydrocarbon fluid and a conventional mineral oil. Repeated electrical discharges were applied to the oils and the resulting physical, chemical, and dielectric changes were characterized. General effects of aging include yellowing, increased water content, reduced viscosity and increased dielectric loss. Whilst the aged oils continue to meet the requirements of the applicable IEC standards for service aged oils after the maximum period of aging, the synthetic ester is less resistant to electrical aging than the natural ester, whilst the biofluid and mineral oil offer comparably good performance.
Transformers, Insulation Oils, Aging
225-228
Hosier, Ian L.
6a44329e-b742-44de-afa7-073f80a78e26
Lewin, Paul L.
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Wilson, Gordon
fd02d259-a5b6-44ce-be29-47073c552c5b
11 November 2025
Hosier, Ian L.
6a44329e-b742-44de-afa7-073f80a78e26
Lewin, Paul L.
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Wilson, Gordon
fd02d259-a5b6-44ce-be29-47073c552c5b
Hosier, Ian L., Lewin, Paul L., Andritsch, Thomas and Wilson, Gordon
(2025)
Electrical aging of insulation oils.
In Proceedings of the 2025 IEEE Conference on Electrical Insulation and Dielectric Phenomena.
IEEE.
.
(doi:10.1109/CEIDP61707.2025.11218360).
Record type:
Conference or Workshop Item
(Paper)
Abstract
In this investigation we have carried out a comparative electrical aging study of a natural ester, a synthetic ester, a bio-sourced hydrocarbon fluid and a conventional mineral oil. Repeated electrical discharges were applied to the oils and the resulting physical, chemical, and dielectric changes were characterized. General effects of aging include yellowing, increased water content, reduced viscosity and increased dielectric loss. Whilst the aged oils continue to meet the requirements of the applicable IEC standards for service aged oils after the maximum period of aging, the synthetic ester is less resistant to electrical aging than the natural ester, whilst the biofluid and mineral oil offer comparably good performance.
Text
Paper1172-Hosier-v3
- Accepted Manuscript
More information
Accepted/In Press date: 14 September 2025
Published date: 11 November 2025
Venue - Dates:
2025 IEEE DEIS Conference on Electrical Insulation and Dielectric Phenomena, Conference Centre at the University of Manchester, Nancy Rothwell Building, Manchester, United Kingdom, 2025-09-14 - 2025-09-17
Keywords:
Transformers, Insulation Oils, Aging
Identifiers
Local EPrints ID: 506641
URI: http://eprints.soton.ac.uk/id/eprint/506641
PURE UUID: f7ea1399-a53a-4668-b464-523ced487fed
Catalogue record
Date deposited: 12 Nov 2025 17:59
Last modified: 13 Nov 2025 02:45
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