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) H01G 4/22 (2006.01)

Patent

CA 1339625

An electrical insulating oil composition which comprises 45% by weight or more of at least 2 members selected from the group consisting of (a) m-ethylbiphenyl, (b) p-ethylbiphenyl, (c) o-benzyltoluene, (d) m-benzyltoluene, (e) p-benzyltoluene, and (f) 1,1-diphenylethane; and the remainder of non-condensed bicyclic aromatic hydrocarbons having not more than 17 carbon atoms besides the above 6 components; and is characterized in that, when the temperature of the composition is -40°C, (I) the total quantity of solid phase obtained by calculating according to the following solid-liquid equilibrium equation is 45% by weight or less relative to the total quantity of the composition, and (II) in the liquid phase composition calculated by the following solid-liquid equilibrium equation, the total quantity of the compounds (a) to (f) is 40% by weight or more and the viscosity of this liquid phase is 500 cSt or lower, (see fig.I) wherein Xi is the equilibrium mole fraction of a component i in the liquid phase; Image is a heat of fusion (cal.mol-1); Image is a melting point (K); T is the temperature (K); and R is the gas constant (cal.mol-1.K-1).

546057

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