ABB has commissioned the subsea transmission link connecting the 325 MW Thornton Bank offshore wind farm to the Belgian grid. The project, executed for wind developer C-Power NV, was completed on schedule.
The transmission link was constructed as part of an expansion of the Thornton Bank wind farm. In the first phase of its development, six wind turbines with a total capacity of 30 MW were built and temporarily connected to the mainland by ABB. The second and third phases of the project involved adding 48 wind turbines to the wind farm and connecting the complete wind farm, taking its overall capacity to 325 MW. The final turbines were installed in July. The transformer station platform collecting and transmitting the power to the coast of Belgium is placed 30 km offshore in the North Sea.
As part of the turnkey project, ABB was responsible for the system engineering, design, supply and commissioning of the alternating current (AC) subsea cables, the land-based cable systems, as well as the offshore substation and platform that houses it. The wind turbines are connected via underwater medium-voltage cables to the offshore transformer station where the voltage is boosted to 150 kV and connected to the mainland grid. The electricity is then fed into the grid at the Slijkens high-voltage substation located at Bredene, about 3 km inland.