article · Engineering Reports
ABSTRACT The application of alternative liquids in power transformers, instead of traditionally used mineral oils, is increasing due to safety and environmental reasons. Current research focuses on inedible natural esters to reduce the cost of production while avoiding a conflict with the food industry. This paper presents the issues of a comparative aging study between thermally Upgraded Kraft (TUK) and Nomex‐910 insulating papers. Both papers were impregnated with palm kernel oil methyl ester (PKOME) and thermally aged. Dielectric and physicochemical tests were performed on new and aged samples. The Nomex‐910 paper AC Breakdown Voltage (BDV) exceeded the corresponding values obtained with the TUK paper. However, PKOME/TUK samples had a smaller acid number than PKOME/Nomex. The PKOME kinematic viscosity exhibited an increase with aging. Also, the 2‐FAL content and the degree of polymerization (DP) were estimated from the mean UV absorption values. This study shows that insulating papers can be associated with natural monoesters to improve the performance of power transformers.
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DOI: 10.1002/eng2.70297
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