LAN CHANGEOVER SYSTEM AND POWER SYSTEM SUPERVISORY AND CONTROLLING SYSTEM

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 trans...

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Bibliographische Detailangaben
Hauptverfasser:	OKUDERA SUKENAO, FURUKI HITOSHI, TERUNUMA TAKESHI, MANO TATSUHIRO, MORI YUICHI
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTINGELECTRIC POWER COMPUTING CONVERSION OR DISTRIBUTION OF ELECTRIC POWER COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DIGITAL DATA PROCESSING ELECTRICITY GENERATION PHYSICS SELECTING SYSTEMS FOR STORING ELECTRIC ENERGY TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION
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Beschreibung
Zusammenfassung:	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.