The output from HelWin2 links with the Amrumbank West offshore wind farm via a 690 MW cable connection operating at 320 kV DC. The cable travels 85 kilometers underwater (and 45 kilometers on land) to a mainland converter station northwest of Hamburg, Germany, notes the Prysmian Group, which supplied the cables.
HelWin2 uses extruded high-voltage direct-current (HVDC) cable from Prysmian with Siemens HVDC Plus converter technology used for 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.
HelWin2 is the fourth grid connection to be handed over this year following the BorWin2, HelWin1 and SylWin1 projects commissioned in late January, early February and late April, respectively. Prysmian is currently also implementing the HVDC cable systems for the DolWin3 and BorWin3 projects.