Fântânele - Cogealac Wind Farm

A large-scale project and an outstanding reference for our company is the largest onshore wind farm in Europe, Fântânele-Cogealac, with a total installed capacity of 600 MW.

The project was carried out in two phases, each of them involving technically and organisationally complex works, from design to execution and commissioning of the wind farm's electrical networks.

The Fântânele Wind Farm was designed for a final output of 347.5 MW, with a total of 139 turbines grouped in 4 zones: Fântânele E, Fântânele V1, Fântânele V2 and Fântânele V3. Each zone has a 110/33 kV transformer substation equipped with an 80 MVA transformer. All these substations are connected through a 110 kV underground cable network to the main 110/400 kV transformer substation built in the Tariverde area. The 110/400 kV substation is equipped with three 250 MVA transformers.

The Cogealac Wind Farm, with an output of 226.5 MW, is connected through a 110 kV underground cable network to the main 110/400 kV transformer substation in Tariverde. This wind farm has 101 turbines installed, connected through a 33 kV underground network to 3 transformer substations of 110/33 kV. Within this large-scale project, ELM Electromontaj was responsible for building the substations and the underground power lines.

The works carried out were of a high complexity and consisted of the following:

- installation of 33 kV cable, with cross-sections from 95 mm2 up to 630 mm2, including optical fibre, representing the links between the wind turbines and the 33/100 kV, 80 MVA step-up transformer substations, over a length of 350 km;

- installation of 110 kV cable, with cross-sections of 500 mm2 and 1000 mm2, including optical fibre, representing the links between the four 33/10100 km, 80 MVA step-up substations and the 110 kV substation, over a length of 100 km;

- execution of 33 kV and 110 kV joints and termination boxes;

- installation of primary and secondary equipment in 4 transformer substations of 33/110 kV