الفهرس 
Power transformersOnly 14 pages are availabe for public view
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Abstract
Dielectric liquids are widely used in power equipment, especially power transformers. Mineral oil is mostly used as the dielectric medium for most power transformers. Recently, alternative insulating oils such as natural and synthetic esters have been proposed to be used. The main motivation behind using these vegetable oils is their high fire point, high flash point and good biodegradable properties. This study investigates the thermal aging impact on paper insulation impregnated in natural and synthetic esters compared to that impregnated in mineral oil. The oil impregnated paper insulation system was aged at 120 ºC for three aging periods.