FennoSkan

Nexans’ largest HVDC cable

 

Project description:

• A subsea power transmission cable between southern Finland and Sweden following a 200 km long route over the Bay of Bothnia.
• It constitutes a bipole together with the existing 550 MW, 400 kV FennoSkan connection, in operation since in 1989.

 

Customer challenges:

• The customer wanted to improve capacity in the Nordic power market and to  reduce losses in the Nordic transmission grids  at the same time as improving power system reliability.
• The FennoSkan 2  should provide a 40 percent increase in the power transmission capacity between the two countries.

 

Nexans' solutions: The HVDC cable was approx. 200 km long with a capacity of 800 MW and 500 kV. With a copper cross-section of 2000 mm2, this was the largest HVDC cable produced by Nexans at the time of installation . The cable was supplied in two continuous lengths of around 100 km each, requiring just a single splice offshore. Laying of the cable was carried out in 2011 by use of C/S Nexans Skagerrak and the cable was protected by use of Nexans' Capjet system.