Jayasree T., Ungarala Mohan Rao, Fofana Issouf, Brettschneider Stephan, Rodriguez-Celis Esperanza et Picher Patrick. (2021). Pre-breakdown Phenomena and Influence of Aging Byproducts in Thermally Aged Low Pour Point Ester Fluids Under AC Stress. IEEE Transactions on Dielectrics and Electrical Insulation, 28, (5), p. 1563-1570.
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URL officielle: http://dx.doi.org/doi:10.1109/TDEI.2021.009600
Résumé
Application of low pour point esters in transformers insulation serving in cold climatic regions is still a challenge. To address this concern, the pre-breakdown and breakdown analyses of thermally aged low pour point ester fluids are investigated. The breakdown measurements are performed at different aging conditions under AC stress. Needle-plane electrode geometry (with varying radii of the tip) is employed since this configuration is necessary for any practical diagnostic based on partial discharge (PD). This allows studying the effect of the chemical impurities (aging by-products) as assessed by some physicochemical properties (acidity, particles count, turbidity, and dissolved decay products) on the partial discharge and breakdown characteristics. The complete analysis is carried out for liquids having the pour points less than -50 °C, including a mineral oil (MO) and two synthetic ester liquids (SE1 and SE2). Changes in the streamer properties, such as partial discharge inception voltage (PDIV), breakdown-streamer inception voltage, and breakdown voltage are reported as a function of the needle tip radius and aging condition. It is observed that the breakdown properties of SE1 are better than that of SE2 and are comparable to MO. To understand the influence of aging on the PD, correlations between decay products, acidity, BSIV, and PDIV are reported. It is observed that the acidity and concentration of decay products directly impact the PD characteristics.
Type de document: | Article publié dans une revue avec comité d'évaluation |
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Volume: | 28 |
Numéro: | 5 |
Pages: | p. 1563-1570 |
Version évaluée par les pairs: | Oui |
Date: | 1 Novembre 2021 |
Sujets: | Sciences naturelles et génie > Génie Sciences naturelles et génie > Génie > Génie des matériaux et génie métallurgique 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) |
Mots-clés: | partial discharges, partial discharge measurement, degradation, breakdown voltage, liquids, electric breakdown, insulation, transformer, pre-breakdown, ester fluids, oils, décharges partielles, mesure de décharges partielles, dégradation, tension de claquage, liquides, panne électrique, huiles |
Déposé le: | 15 nov. 2021 20:04 |
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Dernière modification: | 25 janv. 2022 16:16 |
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