JPS_V4_N4_RP1 Chilaka Ranga Ashwani Kumar Chandel Rajeevan Chandel Journal on Power Systems Engineering 2322–0376 4 4 1 10 Transformer Oil, 1,2,3-benzotriazole, 2,6-dibutyl-4-methylphenol, Aging, Water Content, Flash Point, Interfacial Tension, Breakdown Voltage Power transformers are very important and expensive components of electricity transmission and distribution networks. Though the failure rate of transformers is generally low, however, in the event of a failure, huge repair costs and long shutdown time are generally needed. The life of insulation decides the service lifetime of the transformers. Several oxidation inhibitors are generally inhibited into the oil in order to improve the lifetime. These inhibitors reduce the oxidation process inside the transformers insulation, and improve the dielectric strength. The present paper determines and compares the effectiveness of 1,2,3-benzotriazole and 2,6-dibutyl-4-methylphenol inhibitors on the oxidation degradation of mineral transformer oil subjected to higher accelerated thermal stresses. It improves the quality and the service lifetime of the insulation in transformers. November 2016 - January 2017 Copyright © 2017 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=11392