The system is designed for supervision and control of technological devices inside subway stations and there power substations.

The system consists of:

  • a subsystem for supervising and control of the power station and
  • a subsystem for supervising and control of all other technological devices in station, like tunnel ventilator, pumps, lighting installation etc.

The power substation is connected with 10 kV city electrical grid and supplies the feeders with DC 825 V and the rest of the devices with 0.4 kV.

The subsystem for control of power substation consists of:

  • controller for supervision and control of DC terminals
  • RTU for supervision and control of 10 kV feeder
  • RTU for supervision and control of 0.4 kV feeder
  • central RTU, which functions as a Data Concentrator and collects the process data from the other RTUs and sends the information to the Control Center
  • local Control Station, for local control of the substation

The process information from the high voltage devices comes, direct from the devices on digital I/O’s, or thought Intelligent Electronic Devices – IED like digital relay protection, Programmable Logic Controller – PLC, measuring devices etc.

In this case, the data exchange is performed through LAN or serial channels and different protocols like Modbus, IEC 60870-5-103 etc.

The local control stations use IEC 60870-5-101 and/or IEC 60870-5-104 for communication and contain:

  • communication software
  • SCADA software
  • visualization software
  • software to archive the events and actions of the operator etc

The system for supervision and control of the technological installations of the metro station, consists of:

  • controllers, installed along the whole station
  • communication server – Front_End server – FE
  • SCADA server
  • Historical Information Server – HIS
  • local Operator Working Stations – OWS

Controllers receive the process information from and execute commands on the devices.

The data exchange between the controllers and the FE server is performed on IEC 60870-5-101 protocol. The SCADA- and HIS Servers receive their data from the FE Server.

The process is visualized on the local OWS, where different graphical and textual figures are represented.