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US 10,373,758 B2Granted
Electrically insulating oil composition, and oil-impregnated electrical equipment
AssigneeJxtg Nippon Oil & Energy Corporation
InventorsTakashi Morikita, Hiroyuki Hoshino
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Abstract
It is an object to provide an electrically insulating oil composition that can maintain dielectric breakdown voltage high in a wide temperature range of −50° C. to 65° C., and can suppress a decrease in dielectric breakdown voltage even in the case of use at high temperature for a long time, and there is provided an electrically insulating oil composition comprising 1,1-diphenylethane and benzyltoluene, wherein the proportion of a para isomer in the benzyltoluene is 45% by mass or more based on a total amount of the benzyltoluene.
Claims6
An electrically insulating oil composition comprising:
- 1,1-diphenylethane;
- and
- benzyltoluene,
- wherein the proportion of a para isomer in the benzyltoluene is 50% by mass or more based on a total amount of the benzyltoluene, such that a decrease in dielectric breakdown voltage of the electrically insulating oil composition is suppressed during its use between 50° C. and 80° C. for 1,000 hours or more.
1 more element
Dependencies are inferred from the claim text.