LAN CHANGEOVER SYSTEM AND POWER SYSTEM SUPERVISORY AND CONTROLLING SYSTEM

摘要

PURPOSE:To attain proper LAN selection at all times by preventing undesired switching of a system LAN in the power system supervisory and controlling system. CONSTITUTION:The power system supervisory control system 10 receiving various information of a power system 1 in on-line real time via a transmission line 2 to supervise and control the power system 1 is provided with plural CPUs 41, 42-4n, information transmission equipments 31-3n and a system LAN (duplicate bus type) 5 interconnecting them, and also with a common share device 6 managing the line state of plural CPUs on the occurrence of a communication fault in the system LAN, and a LAN is selected when occurrence of a fault of all lines is detected by setting a line fault of each CPU to a line state management table of the common share device. Thus, undesired LAN selection is prevented and accurate LAN selection is realized to improve the reliability of the entire system.