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US 12,326,469 B2Granted
Method of determining line fault of power system
AssigneesABB Schweiz AG, Hitachi Energy Ltd
InventorsKai Liu, Qi Zhang
Life of this patent
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Abstract
Methods for determining a line fault of a power system. The methods include obtaining sampled values of voltages and currents of phases of a power line in the power system, determining a phase compensation voltage of a first phase and an interphase compensation voltage of an interphase loop between a second phase and a 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.
Claims18
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.
4 more elements
Dependencies are inferred from the claim text.