The process level is separated from bay level by a process interface called process bus. Process IEDs are connected to bay IEDs via process bus. Process bus is typically an optical link, replacing the hardwired process interface that conventionally links the primary equipment from switchyard to bay level. The station level of SAS includes Operator Work Station with Human Machine. Interface and a gateway to Network Control Center. Network Control Center hosts central Energy Management System (EMS) and/or Supervisory Control and Data Acquisition (SCADA) systems to regulate power generation and distribution to consumers.
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