Offshore transformer platform for DanTysk is complete

Monday, 12 August, 2013 - 10:45
Photo: Vattenfall

The most difficult crane lift in the German offshore wind project DanTysk is complete: On 1 August, the 3,200 tonne substation was positioned on its jacket substructure. The job was done by the crane vessel Oleg Strashnov, which also constructed both the foundation and the platform of the offshore transformer station in less than a week.

Seventy kilometres west of Sylt, around 200 people were involved in the effort of positioning the substation within a centimetre, which is 30 m high and has an area of 36 x 42 m."Assembling a 3,200-tonne colossus the size of a medium-sized office building in the middle of the North Sea in water 25 m deep isn't something you do every day. My compliments to the entire team, which did a fantastic job, despite weather conditions that were not quite optimal," said Holger Grubel, Project Manager at Vattenfall.


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The transformer platform is scheduled to be technically operational by the end of September. Meanwhile, other tasks are also proceeding. About half of the steel foundations for the 80 wind turbines are already installed. In addition, a special ship is laying the cables that will connect the wind turbines to the substation. Currently, more than 450 people are employed and working on various tasks on more than ten ships at the sea construction site of DanTysk. Starting in mid-November, the wind turbines will be set up.

Later, when the wind farm is operational, the offshore transformer station will collect the wind power from all 80 turbines and ramp it up from an AC voltage of 30 kV to 155 kV and pass it to a converter station, from where the electricity will then be transmitted a distance of 165 km to shore as DC current.

DanTysk is scheduled to be operational in the fall of 2014. The offshore project is a joint venture by Vattenfall (51%) and Stadtwerke München (49 %). The investment costs amount to € 1 billion.

Katharina Garus

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