Protection of an electric power transmission network

Phasor data for voltage and current is measured at several locations (A,B) of the network, and is transmitted to a central processing device (2). Protection functions implemented in local protection devices (3a) are emulated and executed based on given redundancy strategy, control commands that are issued by protection and central processing devices. Independent claims are also included for the following: (1) computer program for protection of electric power transmission network; and (2) data processing system for protection of electric power transmission network.