Transelectrica Completes Strengthening Energy Security in Dobrogea

The National Power Grid Company Transelectrica has successfully completed an investment of approximately RON 92 million to strengthen energy security in the Dobrogea region, develop the power transmission grid and the national energy system, by building two new 400 kV double circuit connections, with a total length of 55 kilometres, in the 400 kV Medgidia South Electrical Substation, which thus becomes the third important energy node for power evacuation in Dobrogea.

This work made it possible to commission four 400 kV overhead power lines, respectively: 400 kV Medgidia South – Varna (Bulgaria), 400 kV Medgidia South – Dobrudja (Bulgaria), 400 kV Medgidia South – Stupina and 400 kV Medgidia South – Rahman, thus transforming Medgidia South into an interconnection with the Bulgarian power system. These four lines resulted from the severing of the former interconnection lines with Bulgaria: 400 kV OHL Stupina – Varna and 400 kV OHL Rahman – Dobrudja respectively.

The execution works were carried out by the Association consisting of Electromontaj (association leader), ELM Electromontaj Cluj and Emfor Montaj as subcontractor, and the implementation of the project in the IT systems was carried out with the support of specialists from Teletrans, a subsidiary of Transelectrica, which ensured the modelling and integration of the new lines in the EMS – SCADA system, as well as the communications and data exchanges with the Transmission and System Operator in Bulgaria.

The realisation of this investment project has a significant impact for the Dobrogea area and a particular importance for the Cernavoda Nuclear Power Plant, making the 400 kV Medgidia South substation a particularly important energy hub in this region. As a result of the implementation of this investment, the distribution of power flows on the lines in the Dobrogea area and on the connections with the rest of the system, including Bulgaria, the Republic of Moldova and Serbia, will become more efficient.

Thus, a significant benefit of this work is the reduction of active power losses on 400 kV overhead power lines by about 10 MW, under conditions of high electricity generation in wind power plants.

At the same time, cross-border capacity on the Bulgarian border will be increased by 200 MW to 300 MW for export and about 100 MW for import.

All these developments will contribute to strengthening the transitional stability of the area and the Cernavoda Nuclear Power Plant, as well as to reducing the restrictions on energy production in the Dobrogea area.