Electrical insulating oil composition and capacitors prepared th

Details Electrical insulating oil composition and capacitors prepared th Electrical insulating oil composition and capacitors prepared th

1991-05-08

1992-01-21

Pal, Asok

Metal working

Electric condenser making

585 63, H01G 422, H01B 322

Patent

active

050817582

ABSTRACT:
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 bicycle 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.degree. 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, ##EQU1## wherein X.sub.i is the equilibrium mole fraction of a component i in the liquid phase; .DELTA.H.sub.i.sup.f is a heat of fusion (cal.mol.sup.-1); T.sub.i.sup.f is a melting point (K); T is the temperature (K); and R is the gas constant (cal.mol.sup.-1.K.sup.-1). Electrical capacitors prepared with these electrical insulating oil compositions provide excellent operation at temperatures as low as -40.degree. C., preferably as low as -50.degree. C.

REFERENCES:
patent: 4586972 (1986-05-01), Yokotani et al.
patent: 4750083 (1988-06-01), Sato et al.
patent: 5015793 (1991-05-01), Sato et al.
patent: 5017733 (1991-05-01), Sato et al.

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