Electricity generated by wind turbines from seven towers

Heiderscheid – six years ago three wind turbines were erected in close proximity to the current construction site. At that time the turbines were mounted on steel masts at a height of approximately 60 metres. The power generated by each tower can be used to supply electricity to approximately 400 domestic premises.

Currently seven new towers are being erected or have been completed. They are designed to generate 1.8 mW/h of electrical power per tower, sufficient to supply power to approximately 1,200 homes per tower. Electrical power generated by the windpark Kehmen-Bourscheid is supplied to the Cegedel-network.

The height of a wind tower is 98 metres (measured to the height of the hub). The hub is the point where the three rotors are attached that cause the system to rotate.

Under weak wind conditions and when the wind is too strong the generators are turned off automatically. According to the manufacturer, the swiveling head aligns itself automatically to the direction of the wind.

Every mast consists of 23 concrete elements. The largest weighs 60 tons and the smallest 20 tons. A rotor weighs four tons. The total weight of such a wind tower is 1,000 tons (including foundation and excluding the rotor and the generator).

A wind tower can be erected in about one week. Individual concrete elements are braced internally with steel ropes to guarantee mechanical stability as well as the required lvel of safety. The assembly of a rotor requires about two days. The concrete tower is erected with the help of a 500 ton crane, whereas the installation of the generator calls for a 600 ton latticed mast.

The company ATS (Arendt-Trippel-Steil) is responsible for the cranes. These cranes are not only employed in Luxembourg and, to some extent, these are the largest cranes that have ever been used in Luxembourg.

The company Enercon was responsibile for the erection of the wind towers. At present 18 people work hand in hand on this project, including concrete tower workers, specialists for generators as well as electrical engineers. Nearly 300 trucks have delivered the necessary elements in the form of a "transport exceptionnel". Faults may be discovered From the Enercon offices located in Aurich, northern Germany, and repaired immediately by teams located in the respective area.

The wind park Kehmen-Bourscheid should be ready for operation around September 15.

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