A fault discrimination and a current transformer saturation detection for a differential protection system

A method for controlling a differential protection system for an electrical power system, the method comprising:

• sensing at least one first current through a first end of a transmission line of the electrical power system and at least one second current through a second end of the transmission line;
• determining, based on the sensed at least one first current and the sensed at least one second current, a first computed current and a second computed current;
• determining, based on the first computed current and the second computed current, at least one parameter,
• wherein the at least one parameter is or comprises a ratio of the second computed current to the first computed current, a differential current between the first computed current and the second computed current, and/or a current sum of the first computed current and the second computed current;
• determining, based on the determined at least one parameter and/or the first computed current and the second computed current, a fault in the electrical power transmission line;
• and
• controlling, based on the fault, the differential protection system.