Abstract: Devices, methods, and systems for detecting a fault in an electrical power system which includes a source-side converter in communication with a load-side converter via a transmission line. An output current from the source-side converter to the load-side converter over the transmission line is measured during a time period from a beginning of a first current pulse of the output current to a beginning of a second current pulse of the output current. An output voltage of the source-side converter is reduced, responsive to a profile of the output current differing from an expected profile of the output current during the time period. In some implementations, the expected profile of the output current includes a current limit, and the output current differs from the expected profile by exceeding the current limit during the first current pulse.