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US 12,278,472 B2Granted
Fault classification and zone identification in a power transmission system
AssigneeHitachi Energy Ltd
InventorsOd Naidu, Neethu George
Life of this patent
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Abstract
Fault classification and zone identification in a power transmission system are described. Voltage or current measurements are obtained at a terminal of the transmission line in each of the three phases measured during a fault. Modal transformations are performed on voltage or current measurements to obtain traveling wave signals with reference to each of the three phases. Based on the magnitude of the traveling wave signals the fault is classified.
Claims10
A method for zone identification of a fault comprising:
- identifying a zone of a transmission line where the fault lies based on traveling wave signals when a difference between a computed line length and an actual line length is less than a threshold line length;
- and
- identifying the zone of the transmission line where the fault lies based on a rate of change of incremental terminal current with reference to time when the difference between the computed line length and the actual line length is greater than the threshold line length.
A method for fault classification and zone identification, comprising:
- identifying a zone of a transmission line where a fault lies based on traveling wave signals when a difference between a computed line length and an actual line length is less than a threshold line length;
- identifying the zone of the transmission line where the fault lies based on a rate of change of incremental terminal current with reference to time when the difference between the computed line length and the actual line length is greater than the threshold line length;
- obtaining voltage or current measurements at a terminal of the transmission line in each of three phases measured during the fault;
- performing modal transformations on the voltage or current measurements to obtain traveling wave signals with reference to each of the three phases;
- and
- classifying the fault based on a magnitude of the traveling wave signals.
3 more elements
Dependencies are inferred from the claim text.