Patent ID: 8440116

Claim:
A dielectric fluid composition comprising: an oil of a high mono-unsaturated fatty acid content wherein the mono-unsaturated fatty acid content of the oil is greater than 60%; and one or more fatty acid alkyl esters, each having a fatty acid moiety and an alkyl moiety, wherein the alkyl moiety of the fatty acid alkyl esters has 1 to 4 carbon atoms and wherein the fatty acid moieties of the fatty acid alkyl esters are substantially homologous with the mono-unsaturated fatty acid content of the oil of the dielectric fluid composition and wherein about 60% or more of the fatty acid moieties of the fatty acid alkyl esters are derived from one or more mono-unsaturated fatty acids; and wherein the oil is in the range of 40%-60% v/v of the dielectric fluid composition and the fatty acid alkyl ester is in the range of 40%-60% v/v of the dielectric fluid composition.