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

Claim 9:
10. A device 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 device comprising:
a data acquisition unit configured to obtain 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;
a signal processing unit communicatively coupled to the data acquisition unit and configured to:
detect an event associated with a disturbance in one of the one or more transmission lines or current injection at one of the substations, the signal processing unit configured to detect the event from one or more of the obtained measurements and the obtained status signals; and
estimate the source impedance of the 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; and
a control unit communicatively coupled to the signal processing unit.