US 12,326,469 B2
Method of determining line fault of power system
Kai Liu, Beijing (CN); and Qi Zhang, Fujian (CN)
Assigned to ABB Schweiz AG, Baden (CH); and HITACHI ENERGY LTD, Zürich (CH)
Appl. No. 18/000,058
Filed by ABB Schweiz AG, Baden (CH); and HITACHI ENERGY LTD, Zürich (CH)
PCT Filed Aug. 11, 2020, PCT No. PCT/CN2020/108492
§ 371(c)(1), (2) Date Nov. 28, 2022,
PCT Pub. No. WO2022/032492, PCT Pub. Date Feb. 17, 2022.
Prior Publication US 2023/0236235 A1, Jul. 27, 2023
Int. Cl. G01R 31/08 (2020.01); G01R 25/00 (2006.01); H02H 1/00 (2006.01); H02H 7/22 (2006.01)
CPC G01R 31/085 (2013.01) [G01R 25/005 (2013.01); H02H 1/0007 (2013.01); H02H 7/226 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A method of determining a line fault of a power system, comprising:
obtaining sampled values of voltages and currents of phases of a power line in the power system, the sampled values of voltages and currents being obtained by a relay, the phases at least comprising a first phase, a second phase and a third phase;
determining, based on the sampled values of the voltages and currents, a phase compensation voltage of the first phase and an interphase compensation voltage of an interphase loop between the second phase and the third phase; and
detecting the line fault in the first phase and/or the interphase loop by comparing the phase compensation voltage and the interphase compensation voltage, wherein determining the interphase compensation voltage further comprises:
determining a second compensation voltage of the second phase and a third compensation voltage of the third phase based on the sampled values of the voltages and currents; and
determining the interphase compensation voltage based on at least one of the second phase compensation voltage or third phase compensation voltage.