Prysmian Group has commissioned the high voltage direct current offshore grid connection project HelWin2, located in the German North Sea.

HelWin2 now links Amrumbank West offshore wind farm to an on-land converter station in Büttel, north-wHelWin2 est of Hamburg.

Prysmian says that the 690 MW cable making the connection is operating at the highest commercially available voltage of ± 320 kV DC, along a total route of 130 km – 85 km underwater and 45 km on land.

HelWin2 uses extruded HVDC cable technology from Prysmian together with Siemens HVDC Plus converter technology at the offshore platform and onshore stations. Prysmian Group has also installed the 155 kV HVAC submarine cables, which connect the converter platform HelWin Beta to the respective individual offshore wind farm transformer platforms.

In addition, HelWin Beta has been connected to the neighbouring platform HelWin Alpha via Prysmian’s Feltoflex HV 155 kV, a new generation of high voltage, rubber insulated cable systems that Prysmian says is “easy to lay even in the harshest climate conditions”.