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:
Sep. 07, 1999
Filed:
Apr. 09, 1998
Applicant:
Inventors:
Takashi Sesekura, Tokyo, JP;
Yuji Hase, Tokyo, JP;
Satoru Inoue, Tokyo, JP;
Takashi Hirai, Tokyo, JP;
Takashi Shindoi, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340683 ; 340646 ; 340650 ; 361 36 ; 361 37 ;
Abstract
There is provided at least one pressure detector for detecting a change in pressure of an insulating medium, a vibration detector for detecting vibration of an oil-filled electric equipment, and a determination processor for determining, based on information detected by the pressure detector and the vibration detector, whether an internal short circuit has occurred in the oil-filled electrical equipment.