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Assessing Changes in Thermally Upgraded Papers with Different Nitrogen Contents under Accelerated Aging

Arroyo Fernandez Oscar Henry, Fofana Issouf, Jalbert Jocelyn, Rodriguez Esperanza, Rodriguez Lidia et Ryadi Mohamed. (2017). Assessing Changes in Thermally Upgraded Papers with Different Nitrogen Contents under Accelerated Aging. IEEE Transactions on Dielectrics and Electrical Insulation, 24, (3), p. 1829-1839.

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URL officielle: http://dx.doi.org/doi:10.1109/TDEI.2017.006449

Résumé

Thermally upgraded Kraft (TUK) "Insuldur®" papers prepared from the same batch process but with a different percentage of stabilizing additives (1.2, 2.6 and 4.4% of nitrogen) were studied under accelerated aging at 170 °C. The increment of stabilizing additives in paper with the consequent increment of nitrogen content slows down the rate of molecular chain scission of the cellulose and reduces the paper tensile strength loss rate. However, a progressive reduction in the enhancement of the paper life span by the increment of nitrogenous additives in paper was observed. The cellulose degradation methanol and ethanol markers were found to be reliable and accurate for tracking the aging of TUK papers even with the variation of nitrogen content in paper. A promising correlation between methanol concentration and the paper tensile index with different nitrogen content was determined. This correlation could be used as a basis for developing tools to assess power transformers residual life. FTIR-ATR analyses of dicyandiamide in aged papers showed a rapid reaction and decomposition of dicyandiamide in other compounds that slows down cellulose aging. The nitrogen content of aged paper, measured with the Dumas method, showed a slight variation during the study. This implies that the nitrogen compounds continue to be attached, presumably by polar forces to the paper. Thermogravimetric analysis (TGA) of new and aged Insuldur® paper samples showed that nitrogen additives improve the thermal stability of paper at high temperatures.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:24
Numéro:3
Pages:p. 1829-1839
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:nitrogen, power transformers, accelerated aging, additives, degradation, methanol, azote, transformateurs de puissance, vieillissement accéléré, additifs, dégradation, méthanol, insuldur, degree of polymerization, dicyandiamide, accelerated aging, nitrogen content, Dumas method, ethanol, mechanical properties, TGA, FTIR-ATR, power transformer
Déposé le:19 févr. 2021 16:12
Dernière modification:19 févr. 2021 16:12
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