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:
Jun. 02, 2009
Filed:
Dec. 29, 2006
William Premerlani, Scotia, NY (US);
Marcelo Valdes, Burlington, CT (US);
Thomas Frederick Papallo, Jr., Farmington, CT (US);
Radoslaw Narel, Kensington, CT (US);
Gregory P. Lavoie, Lee, NH (US);
William Premerlani, Scotia, NY (US);
Marcelo Valdes, Burlington, CT (US);
Thomas Frederick Papallo, Jr., Farmington, CT (US);
Radoslaw Narel, Kensington, CT (US);
Gregory P. Lavoie, Lee, NH (US);
General Electric Company, Schenectady, NY (US);
Abstract
A method of operating a relay device, the method comprising the steps of: providing main circuit-breakers and a bus-tie-breaker connecting the main-circuit-breakers; defining a partial-differential-zone comprising a main circuit breaker and the bus-tie breaker; assigning a first value to the direction of the fault current flowing into the partial differential zone;—assigning a second value to the direction of the fault currents flowing out of the partial-differential-zone, wherein the first value is not equal to the second value;—comparing the values assigned to the fault currents; determining if the fault currents are flowing into the partial differential zone; and determining if at least two of the fault-currents is flowing in a different direction with respect to the partial-differential-zone wherein one of the fault currents is flowing into the partial-differential-zone and one of the fault currents is flowing out of the partial differential zone.