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Stability of mineral oil and oil–ester mixtures under thermal ageing and electrical discharges

Hamdi Ahmed, Fofana Issouf et Djillali Mahi. (2017). Stability of mineral oil and oil–ester mixtures under thermal ageing and electrical discharges. IET Generation, Transmission & Distribution, 11, (9), p. 2384-2392.

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URL officielle: http://dx.doi.org/doi:10.1049/iet-gtd.2016.1970

Résumé

This study summarises the results of an experimental investigation on the stability of mineral-based oil mixtures when they are confronted with different ratios of synthetic ester under conditions of electrical discharge, electrical breakdown and a combination of both. The condition of the oil samples was assessed using diagnostic techniques such as gassing tendency, turbidity, dissolved decay products (DDP) and dielectric dissipation factor (DDF), according to ASTM standards. A comparison is made between the performances of fresh and aged samples. The results provide experimental evidence that the chemical composition of hydrocarbon blend is contributing factors to oil gassing. It was observed that aged oils release more gases than new one. It was also observed that the gassing tendency increased with increasing amount of ester for the mixed fluids. The pressure and the absorbance of gases vary proportionally with ester content. Under thermal stress, an increase in pressure is observed especially for the mineral oil sample. The turbidity, DDP and DDF measurements revealed higher values for mineral oil. Importantly, the stability improved with increasing ester content in the blends. Mixed mineral oil/ester therefore offers many advantages with concomitant cost reductions compared with pure synthetic esters.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:11
Numéro:9
Pages:p. 2384-2392
Version évaluée par les pairs:Oui
Date:Juin 2017
Sujets:Sciences naturelles et génie > Génie
Sciences naturelles et génie > Génie > Génie électrique et génie électronique
Sciences naturelles et génie > Sciences appliquées
Département, module, service et unité de recherche:Départements et modules > Département des sciences appliquées > Module d'ingénierie
Mots-clés:insulating oils, turbidity, cost reduction, discharges (electric), mixtures, ageing, standards, huiles isolantes, turbidité, réduction des coûts, décharges (électriques), mélanges, vieillissement, normes, mineral oil stability, oil–ester mixtures, thermal ageing, electrical discharges, mineral‐based oil mixtures, dissolved decay products, dielectric dissipation factor, ASTM standards, hydrocarbon blend, oil gassing, synthetic esters
Déposé le:19 févr. 2021 14:56
Dernière modification:19 févr. 2021 14:56
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