Development of the Intranet-based SCADA (supervisory control and data acquisition system) for power system

This paper proposes to apply the Intranet technology to SCADA (supervisory control and data acquisition system) for power system and presents the result of development of the Intranet-based SCADA trial system. The Intranet-based SCADA is concerned with real-time performance and reliability of supervisory control. How the trial system resolved these issues is discussed and various measurements at the trial system including picture display time, supervisory control response time and failover time are presented. Real time performance, system cost and maintainability of the Intranet-based SCADA are evaluated based upon the trial system. The feature of the Intranet-based SCADA such as failover between geographically separated servers and capability of supervisory control at night from another control center are discussed. Information security of the Intranet-based SCADA that should be paid particular attention to is also discussed