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. 06, 1983
Filed:
Jan. 28, 1982
Marvin F Keeney, Jr, Springfield, PA (US);
General Electric Company, Philadelphia, PA (US);
Abstract
A protective relay having means for adjusting a plurality of characteristic angles is disclosed. A characteristic angle is preselected to correspond to a desired reach representative of one or more zones of an A.C. high voltage transmission line desired to be protected. The adjustable characteristic angle means is interconnected to each of the one or more phases of the A.C. transmission line by a cascaded arrangement of one or more transactors and clamping means. The adjustable characteristic angle means comprises an operational amplifier, a plurality of resistors, a capacitor and selectable means for interconnecting each of the plurality of resistors one at a time to the operational amplifier. The plurality of resistors have values to correspond to the desired characteristic angles of the protective relay. The operational amplifier in combination with the plurality of resistors and the capacitor develop an output signal having a substantially constant magnitude as the characteristic angle is varied.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile