Electrical insulating oil composition

Details Electrical insulating oil composition Electrical insulating oil composition

1987-09-04

1988-06-07

Wax, Robert

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

252570, 361327, 585 63, 585 25, H01G 422, H01B 322

Patent

active

047500832

ABSTRACT:
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-isopropylbiphenyl 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.degree. 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: ##EQU1## wherein X.sub.1 is the equilibrium mole fraction of a component i in the liquid phase of the composition, .DELTA.H.sub.i.sup.f is the heat of fushion (cal.mol.sup.-1) of the component i, T.sub.i.sup.f 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.sup.-1.K.sup.-1).

REFERENCES:
patent: 4054937 (1977-10-01), Mandelcorn et al.
patent: 4266264 (1981-05-01), Mandelcorn et al.
patent: 4506107 (1985-03-01), Sato et al.

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