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Chemical, physical and electrical properties of aged dodecylbenzene 3: thermal ageing of mixed isomers in nitrogen and sealed conditions

Hosier, Ian L., Vaughan, Alun S., Sutton, Simon J., Cooper, Jenny and Davis, Fred J. (2008) Chemical, physical and electrical properties of aged dodecylbenzene 3: thermal ageing of mixed isomers in nitrogen and sealed conditions IEEE Transactions on Dielectrics and Electrical Insulation, 15, (4), pp. 1056-1064. (doi:10.1109/TDEI.2008.4591228).

Record type: Article

Abstract

Commercial dodecylbenzene cable fluid was aged at temperatures of 105 and 135 oC in dry oxygen-free nitrogen. In addition, selected samples were aged at 135 oC under sealed conditions where air was excluded from the headspace above the oil. A variety of analytical techniques, such as ultra-violet visible and infra-red spectroscopy, acid number and water content measurements, were then used to characterize the aged oils. In addition, their electrical properties were assessed by dielectric spectroscopy. Compared with ageing in air, the ageing rate was reduced significantly and, as expected, no major oxidation peaks were detected in the infrared spectrometer. Significantly, very little absorbance at 680 nm (“red absorbers”) was detected in samples aged with copper and, consequentially, no large increases in dielectric loss were recorded within the ageing times considered here. This study compliments previous investigations on cable fluid and 1-phenyldodecane aged in air and show that the same ageing indicators are valid in oils aged under conditions which more closely resemble those found in high voltage plant.

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Published date: August 2008
Organisations: EEE

Identifiers

Local EPrints ID: 266553
URI: http://eprints.soton.ac.uk/id/eprint/266553
PURE UUID: 98721fa9-11a2-478c-b6b9-649f450e0568
ORCID for Ian L. Hosier: ORCID iD orcid.org/0000-0003-4365-9385

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Date deposited: 11 Aug 2008 11:00
Last modified: 18 Jul 2017 07:15

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Contributors

Author: Ian L. Hosier ORCID iD
Author: Alun S. Vaughan
Author: Simon J. Sutton
Author: Jenny Cooper
Author: Fred J. Davis

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