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A refined 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 o

A refined 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 is prepared by refining a mixture of unsaturated dimers of styrenes and alkylbiphenyls and/or alkylnaphthalenes, using a solid acidic substance.

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1. A refined electrical insulating oil which is prepared by refining a mixture using a solid acidic substance, said mixture comprising 1 to 70% by weight of at least one bicyclic monoolefin selected from the group consisting of unsaturated dimers or unsaturated codimers of styrenes such as styrene,

1. A refined electrical insulating oil which is prepared by refining a mixture using a solid acidic substance, said mixture comprising 1 to 70% by weight of at least one bicyclic monoolefin selected from the group consisting of unsaturated dimers or unsaturated codimers of styrenes such as styrene, α-methylstyrene and their monomethyl nuclear substituted compounds and the remainder of alkyl (including cycloalkyl) biphenyl and/or alkyl (including cycloalkyl) naphthalene. 2. The refined electrical insulating oil in claim 1, wherein said solid acidic substance is clay. 3. The refined electrical insulating oil in claim 1, wherein said bicyclic monoolefin is 2,4-diphenyl-4-methylpentene-1 or 2,4-diphenyl-4-methylpentene-2. 4. An oil-filled electrical appliance which is impregnated with an electrical insulating oil which oil is prepared by refining a mixture using a solid acidic substance, said mixture comprising 1 to 70% by weight of at least one bicyclic monoolefin selected from the group consisting of unsaturated dimers or unsaturated codimers of styrenes such as styrene, α-methylstyrene and their monomethyl nuclear substituted compounds and the remainder of alkyl (including cycloalkyl) biphenyl and/or alkyl (including cycloalkyl) naphthalene. 5. The oil-filled electrical appliance in claim 4, wherein said solid acidic substance is clay. 6. The oil-filled electrical appliance in claim 4, wherein said bicyclic monoolefin is 2,4-diphenyl-4-methylpentene-1 or 2,4-diphenyl-4-methylpentene-2. 7. The oil-filled electrical appliance in claim 4, wherein said oil-filled electrical appliance is one member selected from the group consisting of oil-filled capacitor, oil-filled cable and transformer. 8. The oil-filled electrical appliance in claim 4, wherein the insulating material or dielectric material used in said oil-filled electrical appliance is the material made of insulating paper, plastic film or the combination thereof. 9. The oil-filled electrical appliance in claim 8, wherein said plastic film is polyethylene film or polypropylene film.