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TenneT manages the high-voltage grid in the Netherlands and in large parts of Germany. TenneT transmits electricity at 110,000 volts (110 kV) and higher. With over 22,000 kilometres of high-voltage lines, the company crosses borders and connects countries. For TenneT, Gemini was a new experience. Senior manager Gineke van Dijk explains.
In the development of the Gemini Wind Park, a great deal of attention was paid to the offshore construction of the wind park. But Dennis Froeling knows better than most that a great deal of work also had to be done ‘on land’. He is the Package Manager for the Onshore Substation. In other words, he makes sure that the electricity arrives on land safely and can then flow into the Dutch power grid. An introduction.
Take a closer look at the LHVS blueprint. Obviously, the land station provides a sturdy foundation for the transformers which transfer energy from the wind park to the electricity grid. A great deal of attention is paid to continuous reliability.
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Every building requires maintenance. On land it is usually not a problem; just erect scaffolding and get to work. At sea, it’s not that easy. And above all, it’s very expensive. That’s why the paintwork at Gemini Wind Park has been given special attention. QA/QC coordinator Folkert Tazelaar explains why.
Onshore in Antwerp
The two OHVS for the Gemini Wind Park are the centre of the offshore operation. They were assembled in the Hoboken wharf area of Antwerp and are several storeys high, the size of an average apartment building. Van Oord outsourced the construction of the offshore stations to the FICG consortium, a partnership between Cofely Fabricom, Iemants and CG. Fabricom was the lead manager of this consortium.
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Depending on the location of a wind turbine in the wind park, the infield cables vary. The more energy the cables must transport, the larger their dimensions. After the infield cable had been laid onto the seabed, a remotely operated vehicle (ROV) was deployed to initiate the burying of the cable.
When you insert a plug in a socket, you probably know that 230 volts will come out. But how do those volts get there? From the North Sea, the renewable energy generated by Gemini Wind Park travels a long way. It becomes increasingly stronger, until it ultimately decreases so that it can be used to power the appliances in our homes.
Every structure has a ‘crucial detail’. At the Gemini Wind Park, that might be the offshore cables which connect the park to the land. A total of 208(!) km of cable, each with a diameter of approximately 30 cm.
The export cables were carefully laid deep within the ‘Wad’, or Wadden Sea. The cables were installed at a depth that keeps them completely out of harm’s way.
THE MAKING OF GEMINI WIND PARK