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, 585 24, H01G 422, H01B 322

Patent

active

050817574

ABSTRACT:
An electrical insulating oil composition having good low temperature characteristics which comprises at least 4 members selected from the group consisting of (a) m-ethylbiphenyl, (b) p-ethylbiphenyl, (c) o-benzyltoluene, (d) m-benzyltoluene, (e) p-benzyltoluene, (f) 1,1-diphenylethane, and (g) 1,1-diphenylethylene; and is characterized in that the proportion of solid phase at a temperature of -40.degree. C. of the electrical insulating oil composition is not more than 45% by weight and the proportion of the total quantity of solid phase is calculated according to the following general equation of solid-liquid equilibrium: ##EQU1## wherein X.sub.i 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 fusion (cal.mol.sup.-1), T.sub.i.sup.f is the 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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