US 12,287,362 B2
Systems and methods for identifying grid fault type and faulted phase
Venkatesh Chakrapani, Stafford (GB); and Ilia Voloh, Thornhill (CA)
Assigned to GE Infrastructure Technology LLC, Greenville, SC (US)
Filed by General Electric Technology GmbH, Baden (CH)
Filed on Nov. 7, 2022, as Appl. No. 18/053,183.
Prior Publication US 2024/0151762 A1, May 9, 2024
Int. Cl. G01R 31/08 (2020.01); G06Q 50/06 (2024.01)
CPC G01R 31/086 (2013.01) [G06Q 50/06 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for detecting a fault type and faulted phase using two planes in a power grid, the system comprising:
a relay configured to monitor a line of the power grid by measuring three-phase voltages and three-phase currents and generate a monitoring signal; and
a controller, wherein the controller is configured to:
determine three-phase voltage phasors and three-phase current phasors, in response to three-phase voltages and three-phase current samples acquired from current and voltage instrument transformers;
determine a positive sequence voltage, a negative sequence voltage, a zero sequence voltage, and voltage magnitudes in response to phasors of the three-phase voltages;
determine a positive sequence current, a negative sequence current, a zero sequence current, and current magnitudes in response to phasors of the three-phase currents;
capture positive, negative, and zero sequence voltage phasors, positive, negative, and zero current phasors, positive, negative, and zero sequence voltage magnitudes, and positive, negative, and zero sequence current magnitudes;
determine, in response to the negative sequence current magnitude, an absence or a presence of a weak-infeed condition in the line;
determine, in response to the positive, negative, and zero sequence current magnitudes and to the positive, negative, and zero sequence voltage magnitudes, an enabling signal;
determine a delta change in the positive, negative, and zero sequence voltage phasors and a delta change in the positive, negative, and zero sequence current phasors, in response to the positive, negative, and zero sequence voltage phasors, in response to the positive, negative, and zero sequence current phasors, in response to the positive, negative, and zero sequence voltage phasors, and in response to the positive, negative, and zero sequence current phasors;
determine, in response to a first angle between a pair of delta change sequence quantities in a first of the two planes, a first plane sequence signature;
determine, in response to a second angle between two delta change sequence quantities in a second of the two planes, a second plane sequence signature;
determine an initial fault type and faulted phase in the power grid in response to the enabling signal, the first plane sequence signature, and the second plane sequence signature; and
determine a final fault type and faulted phase in the power grid, in response to the initial fault type and faulted phase, and the voltage magnitudes.