General Properties of Mixtures of Naphtenic Insulating Oil with Alkylbenzenes

Mixtures of naphthenic base electrical insulating oil for oil-filled transformer use with a branched-chain type alkylbenzene with high viscosity, a branched-chain type dodecylbenzene and a straight-chain type dodecylbenzene were evaluated for improving the characteristics of naphthenic mineral oil for transformer use. It has been demonstrated that blending the alkylbenzene in the mineral oil brings about some improvements in its chemical and electrical properties.