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Comparative studies of the stability of various fluids under electrical discharge and thermal stresses

Loiselle Luc, Fofana Issouf, Sabau John, Magdaleno-Adame Salvador et Olivares-Galvan Juan Carlos. (2015). Comparative studies of the stability of various fluids under electrical discharge and thermal stresses. IEEE Transactions on Dielectrics and Electrical Insulation, 22, (5), p. 2491-2499.

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Résumé

It is a well-known fact that the service reliability of power transformers largely depends upon the condition of the dielectric fluid. The steady deterioration (under the influence of the multiple stresses) of the insulation has an important impact on the condition of the transformers themselves. This contribution reports some investigations on some commercially available ester, silicone and mineral oil fluids. Some of their physicochemical properties are studied by submitting them to various stresses: electrical, thermal and oxidation. Many comparisons are made according to the quality test results of mineral oil, as it is very familiar to the transformer industry. A new technique using a reactive free radical reagent, 2,2-diphenyl-1- picrylhydrazyl (DPPH), added to both new oil for reference purposes and different aged oil to assess free radical concentration is presented. The gassing tendency under either thermal or electrical stress, along with the physicochemical properties of the fluids, is affected; it is assessed with the production of oxidative aging by-products. The gassing performance characteristics of natural ester fluids are far superior to those of conventional mineral oil. A significant reduction in insulation aging rate was observed with synthetic ester fluids.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:22
Numéro:5
Pages:p. 2491-2499
Version évaluée par les pairs:Oui
Date:Octobre 2015
Sujets:Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:dielectric fluid, mineral oïl, natural ester, physicochemical properties, power transformers, silicone oïl, synthetic ester
Déposé le:28 janv. 2016 23:17
Dernière modification:01 août 2016 12:49
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