Electrical insulating oil composition

Details Electrical insulating oil composition Electrical insulating oil composition

H - Electricity

01

B

31/102

H01B 3/22 (2006.01) H01B 3/44 (2006.01)

Patent

CA 1340753

A new electrical insulating oil composition having improved low temperature characteristics which composition comprises a mixture of 40% by weight or more of benzyltoluene and the remainder of alkyl substituted diphenylmethane having 15 to 17 carbon atoms which is represented by the following general formula: (see formula I) wherein R1 and R2 are hydrogen or C1 to C4 alkyl groups ; R1 and R2 contain a total number of carbon atoms of from 1 to 4; and R1 and R2 are not simultaneously methyl groups; and the proportion of the total quantity of solid phase calculated according to the following general solid-liquid equilibrium equation is 45% by weight or less relative to the total quantity of said composition at -40°C: (see formula II) wherein X i is the equilibrium mole fraction of a component i, in the liquid phase, .DELTA.H~ is the heat of fusion (cal.mol-1), T~ is the melting point (K), T is the temperature (K) system, and R is the gas constant (cal.mol-1.K-1).

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