Internal park substation for DanTysk is ready

Tuesday, 23 July, 2013 - 11:00

After one and a half years of construction, the offshore substation for the wind farm DanTysk has been completed. The two transformers, all of the cables, the switchgear and utility rooms are installed. On 29 June, the substation rolled from the factory floor of the Hollandia shipyard in Rotterdam onto a transport crane, which will bring it to the construction site.

The substation will combine the power of all 80 turbines in the North Sea wind farm and bring it up to the required transport voltage of 155 kV. From this substation, the electricity makes its way to the cluster connection SylWin Alpha 10 km away.

During the loading process, the substation moved forward one centimetre at a time on a multi-wheeler, which is a kind of "centipede on wheels". It was approximately 100 m to the quay, where the barge that would transport it to the construction site waited for its freight, secured with thick mooring lines. Before loading began, the helicopter landing platform was also installed.

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But how does one load a 3,000-tonne monster like that onto a transport barge, without it losing its balance in the water? The professionals at the Hollandia shipyard have the necessary experience. The transport barge has several air chambers which are partially filled with water. Normally, the weight of the substation would push the barge down during loading. However, the experts pump water out of the air chambers at exactly the right moment, so that the buoyancy force increases. The incoming tide helps to ensure that the loading area is at exactly the same height as the quay and the substation can be safely rolled up the ramp onto the boat.

Precision work - and the water level must be checked continuously. The loading process takes an entire day; finally, the substation is safely anchored in its brackets on the barge.

During the following days, the jacket-construction foundation was also loaded onto the barge, along with the piles for anchoring to the seabed.

Katharina Garus

Related article:

SylWin1 has been delayed

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