US 12,244,135 B2
Differential protection using instrument transformer signal transducers
Marcos A. Donolo, Pullman, WA (US); Jay Hartshorn, Pullman, WA (US); Anushka M. Dissanayake, Pullman, WA (US); Pallavi Kulkarni, Pullman, WA (US); Veselin Skendzic, Schwenksville, PA (US); Vinod K. Yedidi, King of Prussia, PA (US); Subhash C. Patel, West Chester, PA (US); and Angelo D'Aversa, Ambler, PA (US)
Assigned to Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed by Schweitzer Engineering Laboratories, Inc., Pullman, WA (US)
Filed on Nov. 16, 2022, as Appl. No. 18/056,087.
Claims priority of provisional application 63/264,751, filed on Dec. 1, 2021.
Prior Publication US 2023/0170685 A1, Jun. 1, 2023
Int. Cl. H02H 7/00 (2006.01); G01R 15/18 (2006.01); H02H 7/045 (2006.01)
CPC H02H 7/0455 (2013.01) [G01R 15/181 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A system to provide protection for an electric power delivery system, comprising:
a first current transformer in electrical communication with a first portion of the electric power delivery system, the first current transformer comprising an electrically continuous secondary winding;
a second current transformer in electrical communication with a second portion of the electric power delivery system, the second current transformer comprising an electrically continuous secondary winding;
a first Rogowski coil in electrical communication with the electrically continuous secondary winding of the first current transformer, and comprising a first signal transducer output;
a second Rogowski coil in electrical communication with the electrically continuous secondary winding of the second current transformer, and comprising a second signal transducer output;
a protective device in electrical communication with the first and second signal transducer outputs, the protective device comprising:
a protection module for determining a fault on the electric power delivery system using signals provided by the first signal transducer output and the second signal transducer output; and
a monitored equipment interface to affect a protective action on the electric power delivery system upon determination of the fault.