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:
May. 03, 1994
Filed:
Mar. 05, 1992
Applicant:
Inventors:
Terunobu Miyazaki, Ibaraki, JP;
Kazuo Nishijima, Katsuta, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01R / ;
U.S. Cl.
CPC ...
324509 ; 340680 ;
Abstract
By forcibly grounding a selected one of three phases of a three-phase power distribution line, a higher line-to-ground voltage is applied to other phases thereby causing very small-scale grounding at a fault position so that the fault position can be specified by detecting the small-scale grounding current as generated.