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Pre-Breakdown and Breakdown Behavior of Synthetic and Natural Ester Liquids under AC Stress

Sékongo Beki, Brettschneider Stephan, Rao U. Mohan, Fofana Issouf, Jabbari Marouane, Picher Patrick et Yeo Zie. (2022). Pre-Breakdown and Breakdown Behavior of Synthetic and Natural Ester Liquids under AC Stress. Energies, 15, (1), p. 167.

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URL officielle: http://dx.doi.org/doi:10.3390/en15010167

Résumé

In the last decades, a large focus is being placed on the sustainability and safety of the power transformer spectrum. Ester liquids, which have interesting properties such as high fire point and biodegradability, are gaining needed attraction. Since in-service condition, thermal aging deteriorates the physicochemical and electrical properties of liquid dielectrics, it is important to study their long-term behavior. In this contribution, the pre-breakdown and breakdown behavior of ester fluids (synthetic and natural) under AC stress are investigated. Important characteristics, such as partial discharge pre-inception voltage, partial discharge inception voltage, breakdown voltage, average streamer velocity, and inception electric field, were assessed. The influence of the radius of curvature (of high voltage needle electrode) as well as the thermal degradation of typical ester liquids are also discussed. Mineral oil was also included in the tests loop as a benchmark for comparative purposes. It is found that the pre-inception voltage of ester liquids was, in most cases, higher than that of mineral oil. For a given radius of curvature, the streamer inception and breakdown voltages decreased with thermal aging. During the streamer initiation, the electric field at the electrode tip decreased with the increase in the radius of curvature. The velocity of the streamers seems to increase with the decrease in the radius of curvature. The period of vulnerability, the so-called “delay time”, seems to be independent of the aging or the radius of curvature for a given condition of the liquid.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1996-1073
Volume:15
Numéro:1
Pages:p. 167
Version évaluée par les pairs:Oui
Date:2022
Identifiant unique:10.3390/en15010167
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:breakdown voltage, partial discharge, power transformer, ester liquids, tension de claquage, décharge partielle, transformateur de puissance, liquides d'ester
Déposé le:21 mars 2022 23:39
Dernière modification:21 mars 2022 23:39
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