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Measurement of the relative free radical content of insulating oils of petroleum origin

Fofana Issouf, Sabau John et Bétié Amidou. (2015). Measurement of the relative free radical content of insulating oils of petroleum origin. Energies, 8, (8), p. 7690-7702.

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URL officielle: https://doi.org/10.3390/en8087690

Résumé

Oil/paper insulation degradation in transformers involves chemical and physical changes in the materials. Some of the chemical reactions involve very reactive intermediates called free radicals. Free radicals play a major role in a wide variety of ageing processes. The detection of these reactive species in oil may, in principle, provide useful information for monitoring oil degradation. This manuscript details a laboratory technique, which determines the relative content of free radicals in insulating oils of petroleum origin by a spectrophotometric method. Free radicals may be formed in oils under operating or test conditions. The procedure enables the determination of the relative concentration of free radicals, which can act as the precursors of decay products such as charge carriers, oxidized molecules, as well as polymerization products. The technique involves using a reactive free radical reagent, 2,2-diphenyl-1-picrylhydrazyl (DPPH), added to oil to assess free radical concentration. This method is applicable to new, reclaimed, or used oils as well as naturally or artificially oxidized oil (the cause of aging can be chemical, physical, or electrical). In this contribution, free radicals were assessed following electrical discharge application in oil.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:8
Numéro:8
Pages:p. 7690-7702
Version évaluée par les pairs:Oui
Date:Août 2015
Sujets:Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Sciences naturelles et génie > Génie > Génie mécanique
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:free radicals, insulating oïl, reaction kinetics, radicaux libres, oïl isolant, cinétique de réaction
Déposé le:05 juill. 2018 13:37
Dernière modification:05 juill. 2018 14:09
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Creative Commons LicenseSauf indication contraire, les documents archivés dans Constellation sont rendus disponibles selon les termes de la licence Creative Commons "Paternité, pas d'utilisation commerciale, pas de modification" 2.5 Canada.

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