US 12,259,413 B2
Fault detection in an electric power system
Eric Udren, Pittsburgh, PA (US)
Assigned to Quanta Technology, LLC, Raleigh, NC (US)
Filed by Quanta Technology, LLC, Raleigh, NC (US)
Filed on Feb. 4, 2022, as Appl. No. 17/665,235.
Claims priority of provisional application 63/146,320, filed on Feb. 5, 2021.
Prior Publication US 2022/0252644 A1, Aug. 11, 2022
Int. Cl. G01R 19/10 (2006.01); H02H 1/00 (2006.01); H02H 3/04 (2006.01); H02H 3/26 (2006.01)
CPC G01R 19/10 (2013.01) [H02H 1/0007 (2013.01); H02H 3/04 (2013.01); H02H 3/265 (2013.01)] 31 Claims
OG exemplary drawing
 
1. A method comprising:
obtaining a differential measurement signal that indicates, as a function of time, a difference between currents or voltages measured at two or more terminals or boundaries of a fault protection zone of an electric power system;
generating a fault detection signal by cross-correlating the differential measurement signal with a reference signal, wherein the reference signal is the differential measurement signal that is expected upon occurrence of a fault internal to the fault protection zone; and
performing fault detection, for detecting the fault internal to the fault protection zone, as a function of the fault detection signal.