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:
Mar. 05, 1985
Filed:
Jul. 20, 1982
Applicant:
Inventors:
Seiichi Sakai, Kagawa, JP;
Toshihiko Gange, Takamatsu, JP;
Hideo Tsukioka, Mito, JP;
Katuo Sugawara, Hitachi, JP;
Ichitaro Tani, Kitaibaraki, JP;
Etsunori Mori, Hitachi, JP;
Shigeo Shiono, Hitachi, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Shikoku Electric Power Company, Inc., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 23 ; 73 19 ;
Abstract
Method and apparatus for diagnosing abnormality of an oil-filled electric apparatus is disclosed. Presence or absence of abnormality is determined by comparing contents of plural predetermined components contained in gas extracted from the oil of the electric apparatus with respective predetermined reference values. The type of abnormality is determined on the basis of at least one set of two specific components selected from the plural components.