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. 29, 1987
Filed:
Jul. 24, 1984
Applicant:
Inventor:
Bernard Nicolas, Avon, FR;
Assignee:
Service National Electricite de France, Clamart, FR;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 87 ; 361 94 ; 361100 ; 361110 ;
Abstract
The device, for AC operation, is applicable more especially to the protection of very high tension installations. It comprises a rectifier (12), a comparator for comparing the rectified current and a threshold value (s) and for making, in the case of overshoot, a new comparison after a time equal to and 1/2T+.DELTA.T, T being the nominal period of the AC current and .DELTA.T a fraction of T of the order of a tenth, after overshoot. The new comparison is made with a circuit comprising a memory (22), a timer (24) and a circuit (34) including two inverters and an AND gate. Tripping is produced if overshoot occurs during the new comparison.