RING-WIRE SYSTEM PROTECTIVE RELAY SYSTEM

PROBLEM TO BE SOLVED: To provide a ring-wire system protective relay system capable of easily changing a hardware function in the case where the number of terminal devices within a ring-wire system is increased/decreased.SOLUTION: The ring-wire system protective relay system makes a multiplexing/demultiplexing section and an HDLC section (a transmission circuit 21, a multiplexing setting circuit 22, receiving circuits 23to 23and demultiplexing setting circuits 24to 24) common between a central protective relay device and a terminal device and comprises: a setting table in which system position numbers according to an alignment sequence of power systems in a configuration of a ring-wire system to be protected, device identification numbers according to an installation sequence of terminal devices, transmission line position numbers according to an alignment sequence of communication lines and terminal names according to user names are set so as to change the correspondence thereof; and a processing device for the HDLC section in which the setting table is referenced to set terminal names corresponding to system position numbers, device identification numbers corresponding to system position numbers and device identification numbers corresponding to transmission line numbers and, with increase/decrease of the terminal devices, system position numbers corresponding to the device identification numbers are changed and set.