Good Summary of Electricity Utility Control Systems

Two major, complex real-time control systems monitor and control the power system at this Utility: the transmission Energy Management System (EMS) and the Distribution Management System (DMS). There are many applications within EMS; however one of the main functions is Supervisory Control and Data Acquisition (SCADA), which scans data from (or sends control to) the field devices via the Remote Terminal Units (RTUs) through the master station equipment or Front-End Processors. The EMS and DMS systems are primarily used for real-time operational purposes and are not intended for long-term data storage.

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