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. 26, 1980
Filed:
Jan. 11, 1979
Applicant:
Inventor:
Michael J Estes, Scotts Valley, CA (US);
Assignee:
RTE Corporation, Waukesha, WI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02H / ;
U.S. Cl.
CPC ...
361 93 ; 361103 ;
Abstract
A relay for tripping a circuit breaker in a high voltage power line, the relay including a current transformer having first and second turns ratios, a heat radiation circuit including a plurality of lamps connected to the current transformer and a sensing circuit including a phototransistor which responds to heat radiation from one of said lamps, the turns ratios and lamps being selectively connectable to provide different minimum trip current levels of the relay.