Patent ID: 11916367
Assignee: HITACHI ENERGY SWITZERLAND AG
Field: Measurement (Instruments)
Classification: CPC H  G | IPC G  H

Claim 0:
1. A method for estimating source impedances across one or more transmission lines connecting at least two substations, each substation associated with an equivalent source having a respective source impedance, the method comprising:
obtaining voltage and current measurements and status signals, the voltage and current measurements providing terminal voltages and line currents at each substation, and the status signals being associated with switching events at the one or more transmission lines or at the substations;
detecting an event associated with a disturbance in a transmission line or current injection at one of the substations, the event being detected from one or more of the obtained measurements and the obtained status signals; and
estimating the source impedance of each equivalent source based on the event, using line parameters and the voltage and current measurements associated with the event, the measurements associated with the event comprising the measurements before and after the event.