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Effect of aging on the physical, chemical and dielectric properties of dodecylbenzene

Effect of aging on the physical, chemical and dielectric properties of dodecylbenzene
Effect of aging on the physical, chemical and dielectric properties of dodecylbenzene
High voltage transformers and cables form integral parts of the electrical power distribution network and therefore their reliable operation is crucial to preventing costly outages. A liquid dielectric, typically mineral oil, is used in transformers whilst dodecylbenzene is gradually replacing mineral oil in paper/oil cable systems. As such, the oil serves as a convenient medium for sampling to assess plant health. In the current investigation, samples of dodecylbenzene cable oil were aged at 135 ºC under conditions where the oxygen diffusion into the oil was deliberately limited. The resulting aged samples were subjected to a battery of tests to determine changes in their physical, chemical and dielectric properties. Aging resulted in yellowing, oxidation, increased water content, increased dielectric loss, increased electrical conductivity and reduced electrical breakdown strength. Copper accelerated the aging process resulting in the formation of an insoluble precipitate; however, the inclusion of this material did not affect the electrical properties of the oil indicating that it is non-polar in nature. Instead, the deterioration of the dielectric properties was found to be correlated with the production of small polar molecular compounds, which remain dissolved within the oil, such as water, alcohols, ketones, carboxylic acids and aldehydes.
3389-3396
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Koilraj, Jim
9d69d1a5-7bb5-4fa6-8087-374b9e216caf
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3
Hosier, Ian
6a44329e-b742-44de-afa7-073f80a78e26
Koilraj, Jim
9d69d1a5-7bb5-4fa6-8087-374b9e216caf
Vaughan, Alun
6d813b66-17f9-4864-9763-25a6d659d8a3

Hosier, Ian, Koilraj, Jim and Vaughan, Alun (2016) Effect of aging on the physical, chemical and dielectric properties of dodecylbenzene. IEEE Transactions on Dielectrics and Electrical Insulation, 3389-3396. (doi:10.1109/TDEI.2016.005999).

Record type: Article

Abstract

High voltage transformers and cables form integral parts of the electrical power distribution network and therefore their reliable operation is crucial to preventing costly outages. A liquid dielectric, typically mineral oil, is used in transformers whilst dodecylbenzene is gradually replacing mineral oil in paper/oil cable systems. As such, the oil serves as a convenient medium for sampling to assess plant health. In the current investigation, samples of dodecylbenzene cable oil were aged at 135 ºC under conditions where the oxygen diffusion into the oil was deliberately limited. The resulting aged samples were subjected to a battery of tests to determine changes in their physical, chemical and dielectric properties. Aging resulted in yellowing, oxidation, increased water content, increased dielectric loss, increased electrical conductivity and reduced electrical breakdown strength. Copper accelerated the aging process resulting in the formation of an insoluble precipitate; however, the inclusion of this material did not affect the electrical properties of the oil indicating that it is non-polar in nature. Instead, the deterioration of the dielectric properties was found to be correlated with the production of small polar molecular compounds, which remain dissolved within the oil, such as water, alcohols, ketones, carboxylic acids and aldehydes.

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5999 (Hosier) 29 July 2016, proofread version.pdf - Accepted Manuscript
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Accepted/In Press date: 29 July 2016
Published date: December 2016
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 402417
URI: http://eprints.soton.ac.uk/id/eprint/402417
PURE UUID: bde37592-8638-4d8b-8616-35ae45d8c2e8
ORCID for Ian Hosier: ORCID iD orcid.org/0000-0003-4365-9385
ORCID for Alun Vaughan: ORCID iD orcid.org/0000-0002-0535-513X

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Date deposited: 08 Nov 2016 15:34
Last modified: 07 Oct 2020 01:49

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Author: Ian Hosier ORCID iD
Author: Jim Koilraj
Author: Alun Vaughan ORCID iD

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