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:
Apr. 16, 2013
Filed:
Jul. 07, 2010
Fukutaro Kato, Chiyoda-ku, JP;
Eiichi Nagao, Chiyoda-ku, JP;
Tsuyoshi Amimoto, Chiyoda-ku, JP;
Satoru Toyama, Chiyoda-ku, JP;
Kota Mizuno, Chiyoda-ku, JP;
Fukutaro Kato, Chiyoda-ku, JP;
Eiichi Nagao, Chiyoda-ku, JP;
Tsuyoshi Amimoto, Chiyoda-ku, JP;
Satoru Toyama, Chiyoda-ku, JP;
Kota Mizuno, Chiyoda-ku, JP;
Mitsubishi Electric Corporation, Chiyoda-Ku, Tokyo, JP;
Abstract
An initial concentration of the residual concentration of a causative substance contained in an insulating oil is compared with a reference value. The causative substance reacts with a conductor forming a winding of an oil-filled electrical device to generate an electrically conductive compound. The reference value is defined as a value for determining whether a main determinant that determines the lifetime of the oil-filled electrical device is generation of the electrically conductive compound or degradation of insulating paper. Based on the initial concentration of the causative substance and the reference value, the lifetime of the oil-filled electrical device is assessed.