The apparatus is designed for transmission and reception of relay protection signals, telecontrol command signals via RF channel formed by 110-750 kV overhead line wires or via fibre-optic communication channel (via dedicated FOCL). Functions: Transmission and reception of relay protection signals; Control of serviceability of the communication channel; Control of serviceability of the communication channel; Receipt and transmission of telecontrol commands; Recording to non-volatile memory; Data transmission (TM); Transmission to ACS; Synchronisation of the built-in clock by GPS signals.
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