Time-domain distance line protection of electric power delivery systems

A system configured to detect a fault in an electric power delivery system, comprising:

• a data acquisition subsystem configured to acquire a plurality of time-domain representations of electrical conditions in the electric power delivery system at each of a first terminal and a second terminal;
• an incremental quantities subsystem configured to:
• calculate a plurality of values of an operating quantity based on the plurality of time-domain representations of electrical conditions;
• calculate a plurality of values of a restraining quantity based on the plurality of time-domain representations of electrical conditions;
• determine an interval during which the calculated operating quantity exceeds the calculated restraining quantity;
• a fault detector subsystem configured to declare a fault based on the calculated operating quantity exceeding the calculated restraining quantity by a security margin;
• a protective action subsystem configured to implement a protective action on the electric power delivery system based on the declaration of the fault.