Upgrading semi-buried substations, LR71 substation and RMU

The upgrade of semi-buried substations, LR71 substation and RMU was carried out in 2017-2019 across 28 locations in Belgrade, under investor ODS EPS Distribucija, Belgrade Branch. It included procurement and installation of automation equipment, as well as remote stations for upgrading existing medium-voltage plants (10 kV) – ring main units, which created conditions for remote monitoring and control of medium-voltage plants and their integration within the SDU.

Existing medium-voltage plants – ring main units have two or more line bays equipped with switch disconnectors and one or two transformer bays with switches and corresponding protective devices or switch disconnectors. Within the low-voltage plants – ring main units, which are located within the semi-buried substations, multifunctional measuring devices manufactured by Schneider Electric are provided, which are installed on the low-voltage side of the substation in the transformer bay. The measuring devices have a serial port RS-485 with MODBUS protocol support, which is used for connection to the corresponding port at the remote station for their integration into the remote monitoring and control system.

The substation is located in a densely populated part of the city where it provides better electricity supply. It reduces power supply problems.