INFORMATION MULTIPLEX/DEMULTIPLEX CIRCUIT OF RING LINE SYSTEM PROTECTIVE RELAYING SYSTEM

PROBLEM TO BE SOLVED: To multiplex/demultiplex information reliably and easily while reducing the size and power consumption of the whole protective relaying system.SOLUTION: The multiplex/demultiplex circuit of protective relay information transmitted between a central relay device and a terminal has a novel configuration different from the conventional one, and one-board configuration is possible in the central relay device and the terminal, respectively. For example, the multiplex/demultiplex circuit 100 consists of separation logics (1-7) of received signals from system 1 and system 2, and multiplex logics (8-16) for transmitting various types of information from the relay 200 of the terminal while multiplexing, and these separation logics and multiplex logics are integrated in an IC. External interfaces (52, 53) of various system information from the relay, and a CPU (51) performing control of these multiplex/demultiplex logics and communication control are mounted on one communication board (300).