Pfisterer has secured a contract to connect two converter stations within the 900MW DolWin3 offshore wind high voltage direct current (HVDC) link in the German North Sea.

Dolwin

The company claims that the 250m high-voltage cable link will be the world’s longest connection between two offshore platforms.

It will feature a highly flexible 155kV Feltoflex cable with a conductor cross section of 800mm².

The connection between the DolWin gamma and DolWin alpha platforms, situated 80km offshore, will enable operators to switch over between the converter stations when required.

The onshore work has already started for equipping the converter station, and the HV offshore link is expected to be completed by mid-2017.

Pfisterer director of sales for cable accessories and systems Eduardo Santana said: "The DolWin3 order is consolidating our position as the leading manufacturer of cable assemblies in the offshore wind energy sector, as well as our expertise and ability to offer complete integrated systems."

The DolWin3 project, which is expected to cost over €1bn, will link the North Sea wind farms to the mainland supergrid.

It is the eighth grid link project to be undertaken by the German-Dutch transmission system operator TenneT using direct current technology.

In July 2015, Alstom delivered and installed two 700 MVA power transformers on a platform developed for the project.

As the general contractor for TenneT, Alstom delivers and builds both the onshore and offshore converter stations as well as the connecting cable systems for DolWin3 project.


Image: Pfisterer will connect two offshore wind power converter stations. Photo: Courtesy of PFISTERER Holding AG.