General Properties of Mixtures of Paraffinic Insulating Oil with Alkylbenzenes

Mixtures of a paraffinic-base electrical insulating oil for oil-filled transformer use with a branchedchain type alkylbenzene with high viscosity, a branchedchain type dodecylbenzene and a straight-chain type dodecylbenzene were evaluated for improving the characteristics of a paraffinic mineral oil for transformer use. It has been demonstrated that blending the alkylbenzenes in the paraffinic oil brings about some improvements in its chemical, physical, and electrical properties. Moreover, it has been concluded that a modified paraffinic oil which contains 50% of the branched dodecylbenzene gives overall characteristics almost equivalent to the naphthenic transformer oil which is practically employed.