Patent ID: 8097187
Filing Date: 2012-01-17
Classification: C09K,H01B,H01F,Y10T

Abstract:
1. An electrical device with a dielectric fluid therein, wherein the dielectric fluid comprises: (a) 1% to 50% by weight of a composition comprising: a polyol ester derived from: (1) a reaction of a polyol having two to four hydroxyl moieties with a fatty acid having 4 to 12 carbon atoms, wherein the fatty acid is saturated or unsaturated; or (2) the transesterification of a polyol having two to four hydroxyl moieties with a methyl ester of a fatty acid having 4 to 12 carbon atoms, wherein the fatty acid is saturated or unsaturated; (b) 0.1% to 2.5% by weight of at least one additive selected from an antioxidant, an antimicrobial agent, and a pour point depressant; and (c) the balance a petroleum derived mineral oil or a petroleum derived synthetic oil.