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:
Nov. 19, 2002
Filed:
Jul. 21, 2000
Applicant:
Inventors:
Ara Kulidjian, Toronto, CA;
Bogdan Kasztenny, Markham, CA;
Assignee:
General Electric Co., Schenectady, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H 7/04 ; H02H 3/42 ; H02H 3/26 ;
U.S. Cl.
CPC ...
H02H 7/04 ; H02H 3/42 ; H02H 3/26 ;
Abstract
A method and relay for magnetizing inrush restraint in protective relays for power transformers. The method utilizes the phase angle relation between the fundamental component and the second harmonic in addition to the magnitude ratio. This is accomplished by calculating and utilizing the complex second harmonic ratio. The specially shaped operating characteristic for the complex second harmonic ratio is made dynamic providing for better security without jeopardizing dependability of the transformer protective relay.