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 1335325

An electrical insulating oil composition which is excellent in low temperature characteristics and suitable for use in impregnating capacitors, and comprises (a) m-ethylbiphenyl, (b) p-ethylbiphenyl, (c) m-isopropyl- biphenyl and (d) p-isopropylbiphenyl, and is characterized in that the total amount of the ethylbiphenyls is not less than 40% by weight and the proportion of solid phase in the composition at a temperature of -40°C is not more than 45% by weight, the solid quantity of each component being calculated according to the following equation of solid-liquid equilibrium: Image wherein Xi is the equilibrium mole fraction of a component i in the liquid phase of the composition, .DELTA.H? is the heat of fusion (cal.mol-1) of the component i, T? is the melting point (K) of the component i, T is the temperature (K) of the system, and R is the gas constant (cal.mol-1.K-1).

546051

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