Electrical insulating oil and oil-filled electrical appliances

摘要

An improved electrical insulating oil and oil-filled electrical appliances impregnated therewith. The electrical insulating oil can be produced inexpensively but has excellent electrical characteristics and it comprises a fraction having boiling points in the range of 350 DEG to 450 DEG C. that is prepared by disproportionating diarylalkane or a hydrocarbon mixture mainly containing the same at temperatures in the range of 20 DEG to 500 DEG C. in the presence of a disproportionation catalyst, said diarylalkane having boiling points in the range of 260 DEG to 320 DEG C.