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Monitoring the Sol and Gel in Natural Esters under Open Beaker Thermal Aging

Ungarala Mohan Rao et Fofana Issouf. (2021). Monitoring the Sol and Gel in Natural Esters under Open Beaker Thermal Aging. Dans : 2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) , 3-5 Dec. 2021, Kozhikode, India.

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Résumé

The application of natural ester-based dielectric liquids for liquid-filled transformers is a topic of high concern for transformer owners and utilities. The potential advantages of being biodegradable, high flash point, good dielectric properties, and high moisture tolerance encapsulated natural esters to be a promising solution for transformer insulation systems. Several research reports are affirmative towards the usage of natural esters in transformers. Meanwhile, the poor oxidation stability of natural esters is a challenge that needs to be emphasized. Natural esters develop a polymerized aging product known as gelling under the influence of oxygen. Before gelling occurs, the first thing is to form sol in the bulk of the liquid that influences the liquid viscosity and further accelerates oxidation. Thus, in this paper, a natural ester is subjected to accelerated thermal aging to observe and understand the formation of sol. However, accelerated thermal stressing is continued till gelling is evident in the liquid. The changes in liquid absorbance with aging and the level after which sol is developed is reported. The changes in the viscosity of the natural ester with the formation of sol and gel are also reported. Further, the compositional changes of the liquid that are responsible for the formation of sol are reported using FTIR analysis. Finally, the breakdown failure rate of the completely gelled natural ester is reported to understand the influence of the gelling on the liquid breakdown strength.

Type de document:Matériel de conférence (Non spécifié)
Date:3 Décembre 2021
Organisation:2021 IEEE 5th International Conference on Condition Assessment Techniques in Electrical Systems (CATCON), Kozhikode, India, 3-5 Dec. 2021
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
Unités de recherche > Centre international de recherche sur le givrage atmosphérique et l’ingénierie des réseaux électriques (CENGIVRE) > Vieillissement de l’appareillage installé sur les lignes à haute tension (ViAHT)
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Mots-clés:viscosity, temperature sensors, temperature measurement, liquids, electric breakdown, oxidation, dielectric liquids, viscosité, capteurs de température, mesure de température, liquides, panne électrique, oxydation, liquides diélectriques, power transformer, natural esters, insulation, dielectric liquid, gelling, Proceedings
Déposé le:16 mars 2022 23:25
Dernière modification:16 mars 2022 23:35
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