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Flexible cable link in middle of North Sea

Staff writer ▼ | May 18, 2016
For the first time, two sister platforms in an offshore wind farm are being directly connected by means of a flexible high-voltage cable. This significantly increases the guaranteed energy feed-in.
North Sea cable
Technology   German-Swiss owned Pfisterer won project in the North Sea
German-Swiss owned Pfisterer is the only cable accessory manufacturer in the world with the necessary qualifications for this.

In the southwestern area of the North Sea, 80 kilometers offshore, the DolWin gamma converter platform is currently being constructed as the third link within the DolWin wind farm cluster.

For the first time, the new platform is being connected to its sister platform DolWin alpha by means of a high-performance 155 kV Feltoflex cable with a cross-section of 800 mm².

With an overall length of 250 meters, this will be the world's longest connection between two offshore platforms. The extremely flexible cable is designed to withstand strong winds and rough seas and is routed in sections across a steel suspension bridge.

On this pilot project, Pfisterer was awarded the contract for laying all high-voltage and medium-voltage cables, both within the platform and over the bridge connection. Direct connections of this type are very rare.

Until now, converter platforms have normally been connected directly to the mainland by submarine cables. The direct connection is profitable for the wind farm operators, however, due to the increased feed-in guarantee, as it is possible to switch between the two platforms as necessary.

Pfisterer has already started the onshore work for equipping the converter station, and by mid-2017 the HV offshore link should also have been completed.