The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 07, 2014
Filed:
Aug. 18, 2008
Eiichi Nagao, Chiyoda-ku, JP;
Kentaro Taninouchi, Chiyoda-ku, JP;
Noboru Hosokawa, Chiyoda-ku, JP;
Tsuyoshi Amimoto, Chiyoda-ku, JP;
Kozo Tachibana, Chiyoda-ku, JP;
Hirotaka Muto, Chiyoda-ku, JP;
Junji Tanimura, Chiyoda-ku, JP;
Satoru Toyama, Chiyoda-ku, JP;
Eiichi Nagao, Chiyoda-ku, JP;
Kentaro Taninouchi, Chiyoda-ku, JP;
Noboru Hosokawa, Chiyoda-ku, JP;
Tsuyoshi Amimoto, Chiyoda-ku, JP;
Kozo Tachibana, Chiyoda-ku, JP;
Hirotaka Muto, Chiyoda-ku, JP;
Junji Tanimura, Chiyoda-ku, JP;
Satoru Toyama, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Chiyoda-Ku, Tokyo, JP;
Abstract
An object of the invention is to provide a diagnostic method for an oil-filled electrical device that considers a temperature distribution in the oil-filled electrical device and enables accurate diagnosis to be conducted even when the method is applied to diagnosis of an actually operating device, and further provide a method with which such diagnosis of an oil-filled electrical device can be conducted from a component analysis value of an insulating oil in the oil-filled electrical device. The invention is a diagnostic method for an oil-filled electrical device including in an insulating oil a metal part wrapped with insulating paper, and determines that a time when a surface resistivity of a maximum precipitation site where metal sulfide is most precipitated on the insulating paper reaches a preset surface resistivity management value is a time of occurrence of an abnormality.