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:
Aug. 07, 1984
Filed:
Sep. 20, 1982
Applicant:
Inventor:
Atsuhiro Yoshizaki, Katsuta, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 79 ; 364483 ;
Abstract
A protective relay which carries out various relay functions by converting externally received AC data into time widths in accordance with protective ranges and determining whether or not the protective operations are necessary on the basis of the time widths. The protective relay receives a plurality of input AC data through a time-dividing device and converts the time-divided data into the time widths for the relay functions to determine the relay operations of the relay functions on the basis of the time widths.