US 12,249,948 B2
Split-phase protection of generators
Ritwik Chowdhury, Charlotte, NC (US); Matchyaraju Alla, Pullman, WA (US); Normann Fischer, Colfax, WA (US); and Dale S. Finney, Little Bras d'Or (CA)
Assigned to Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed by Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed on Aug. 30, 2022, as Appl. No. 17/823,344.
Prior Publication US 2024/0072697 A1, Feb. 29, 2024
Int. Cl. H02P 9/00 (2006.01); H02P 103/20 (2016.01)
CPC H02P 9/006 (2013.01) [H02P 2103/20 (2015.01); H02P 2205/01 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A system configured to monitor at least one generator, the system comprising:
a measurement subsystem to receive a plurality of split-phase measurements of branch currents associated with the at least one generator;
a split-phase transverse differential monitoring subsystem to:
receive the plurality of split-phase measurements of branch currents associated with the at least one generator;
generate a complex exponential function based on the plurality of split-phase measurements of the branch currents to shift a phase of each of the branch currents by multiplying the branch currents with the complex exponential function;
calculate a phasor operating current based on the phase-shifted branch currents; and
generate an offset value representing a standing split-phase current based on the phasor operating current; and
a protective action subsystem to generate a first protective action based on the phasor operating current and the offset value.