Patent ID: 11879928
Assignee: HITACHI ENERGY LTD
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 19:
20. A computer program for differential protection of a transmission line of a transmission system, the computer program comprising computer code which, when run on processing circuitry of an arrangement, causes the arrangement to:
obtain a restraining current and a differential current from the transmission line;
determine a compensation current for the differential current;
provide the differential current as compensated for by the compensation current and the restraining current to a differential protection arrangement for making a trip decision;
detect an internal fault for the transmission system; and
in response to detecting the internal fault, provide the differential current without being compensated for by the compensation current and the restraining current to the differential protection arrangement for making the trip decision.