Fire-retardant electric device
AssigneeNippon Oil Co., Ltd.
InventorsAkira Shinzawa, Yoshiki Kohno
Life of this patent
Estimating the term…
Abstract
An electric device particularly adapted for a fire retardant oil-filled transformer, comprising a cellulose-based insulating material impregnated with an insulating oil composed of 100 parts by weight of an ester of a polyol with a fatty acid having a fire point of 300.degree. C. or above and, incorporated therein, 0.005 to 1.0 part by weight of a phenolic compound having no alkyl groups as the substituent at the ortho positions and 0.01 to 2.0 parts by weight of an epoxy compound.
Claims5
An electric device comprising a cellulose-based insulating oil composed of 100 parts by weight of a fatty acid polyol ester having a fire point of at least 300.degree. C., 0.005 to 1.0 part by weight of a phenolic compound having no alkyl substituents at the ortho positions, wherein said phenolic compound is 4 tert.-butylcatechol, 4-tert.-octylphenyl salicylate, 1,1'-bis(4-hydroxyphenyl)cyclohexane, .beta.-naphthol or 4,4'-isopropylidenebisphenol, and 0.01 to 2.0 parts by weight of an epoxy compound.
Dependencies are inferred from the claim text.