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An improved electrical insulating oil and oil-filled electrical appliances impregnated therewith. The electrical insulating oil is quite suitable for use in oil-filled electrical appliances in which insulating materials or dielectric materials made of plastics are employed. The electrical insulating

An improved electrical insulating oil and oil-filled electrical appliances impregnated therewith. The electrical insulating oil is quite suitable for use in oil-filled electrical appliances in which insulating materials or dielectric materials made of plastics are employed. The electrical insulating oil comprises (a) an electrical insulating oil except polyaromatic hydrocarbons and (b) an aromatic monoolefin and/or diolefin having two condensed or noncondensed aromatic nuclei.

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1. An electrical insulating oil consisting essentially of: (a) at least one electrical insulating oil selected from the group consisting of organic acid esters, animal oils, vegetable oils and aromatic ethers, and (b) 0.01 to 50% by weight of at least one of aromatic monoolefins and/or aromatic

1. An electrical insulating oil consisting essentially of: (a) at least one electrical insulating oil selected from the group consisting of organic acid esters, animal oils, vegetable oils and aromatic ethers, and (b) 0.01 to 50% by weight of at least one of aromatic monoolefins and/or aromatic diolefins each having two condensed or noncondensed aromatic nuclei. 2. The electrical insulating oil in claim 1, wherein the viscosity of said electrical insulating oil is not higher than 30 cSt (3×10 -5 m 2 /s) at 40° C. 3. The electrical insulating oil in claim 1, wherein said aromatic monoolefins are represented by the following general formulae (I) to (IV): ##STR## wherein R 1 is an alkenylene or cycloalkenylene group, each of R 2 and R 3 is a hydrogen atom or an alkyl group, R 4 is an alkenyl or cycloalkenyl group, R 5 is an alkylene or cycloalkylene group, each of m and n is an integer from zero to three, inclusive, and R 2 of m in number and R 3 of n in number are the same groups or different groups from one another. 4. The electrical insulating oil in claim 1, wherein said aromatic diolefins are represented by the following general formulae (V) to (VII): ##STR## wherein each of R 6, R 7 and R 8 is a hydrocarbon residual group, each of m and n is an integer from zero to three, inclusive, R 6 of m in number, R 7, and R 8 of n in number are the same groups or different groups from one another, and the total number of double bonds in said hydrocarbon residual groups is two. 5. An oil-filled electrical appliance which is impregnated with an electrical insulating oil consisting essentially of: (a) at least one electrical insulating oil selected from the group consisting of organic acid esters, animal oils, vegetable oils, and aromatic ethers, and (b) 0.01 to 50% by weight of at least one of aromatic monoolefins and/or aromatic diolefins each having two condensed or noncondensed aromatic nuclei. 6. The oil-filled electrical appliance in claim 5, wherein the viscosity of said electrical insulating oil is not higher than 30 cSt (3×lO -5 m 2 /s) at 40° C. 7. The oil-filled electrical appliance in claim 5, wherein said aromatic monoolefins are represented by the following general formulae (I) to (IV): ##STR## wherein R 1 is an alkenylene or cycloalkenylene group, each of R 2 and R 3 is a hydrogen atom or an alkyl group, R 4 is an alkenyl or cycloalkenyl group, R 5 is an alkylene or cycloalkylene group, each of m and n is an integer from zero to three, inclusive, and R 2 of m in number and R 3 of n in number are the same groups or different groups from one another. 8. The oil-filled electrical appliance of claim 5, wherein said aromatic diolefins are represented by the following general formulae (V) to (VII): ##STR## wherein each of R 6, R 7 and R 8 is a hydrocarbon residual group, each of m and n is an integer from zero to three, inclusive, R 6 of m in number, R 7, and R 8 of n in number are the same groups or different groups from one another, and the total number of double bonds in said hydrocarbon residual groups is two. 9. The oil-filled electrical appliance in claim 5, wherein said electrical appliance is one member selected from the group consisting of oil-filled capacitors, oil-filled cables and transformers. 10. The oil-filled electrical appliance in claim 5, wherein the insulating material or dielectric material used in said oil-filled electrical appliance is insulating paper, synthetic resin film or their combination. 11. The oil-filled electrical appliance in claim 5, wherein said synthetic resin film is polyethylene film or polypropylene film.