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:
Jan. 03, 1978
Filed:
Jun. 03, 1976
Applicant:
Inventor:
Kung C Chow, Whippany, NJ (US);
Assignee:
Westinghouse Electric Corporation, Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 76 ; 361 77 ;
Abstract
A filter, energized by a polyphase power source, is adapted to detect positive or negative sequence components present in the source. Means are provided for summing a first phase quantity with a second phase quantity which has been shifted by 180 electrical degrees. Additional means are utilized to phase shift the summed resultant itself by 120 electrical degrees and to sum the phase shifted resultant with the phase shifted second quantity and a third quantity. The second summation yields an output quantity proportional to only one of the sequence components, if any, present in the polyphase source.