Transformer

In order to prevent power loss, the 690 Volt electrical current produced by the generator is sent through a transformer and raised to 30,000 volts. The transformer is in the engine room at the back of the nacelle and is seperated from the rest of the nacelle by a screen which can be locked. Each wind turbine has a SF6 switching gear system near the entrance inside of the tower.

Type
Ratio
Rated power

Cast resin
0.69 kV / 30 kV
1,850 kVA

Trauttmansdorff and Andreas Dangl in Spain

Tower

Type
Surface
Length
Weight
Sections
Bottom diameter
Top diameter
Mat. of casing
Mat. of flanges

Conical tubular steel tower
Painted
57.9 m
100 Tons
3
4.0 m
2.3 m
Steel grade S 235
Steel grade S 355

Ladder

Ladder inside the tower, equipped with safety measures

Foundation

Type

Dimensions
Concrete grade
Steel grade

Square reinforced concrete foundation
12.00 x 12.00 x 1.70 m
ConcreteB25
Reinforcement steel BST IV S

Tower-
anchorage

Foundation sections with welded ring flanges for diverting vertical tensile and compressive forces into the foundation.

Casing pipe
Flanges

Steelgrade S 235 JO
Steelgrade S 355

Overall view

Manufacturer

Vestas Deutschland GmbH, Husum

Number of WT's
Type
Rated Power
Rotor Diameter
Swept Area

11
V66 - 1.75 MW
1,750 kW
66.0 m
3421 m²

Hub Height
Cut-in Wind Speed
Rated Wind Speed
Cut-out Wind Speed

60.0 m
4 m/s
16 m/s
25 m/s

Yaw Control System

4 electrical geared motors

Mechanical Brake

Disk brake
(Parking brake)

Aerodynamic Brake

Feathering the blades

Generator

Generator

Asynchronous generator with wound rotor, sliprings, power converter with IGBT-switches, contactors and protection device (VCS - Vestas Converter System)

Frequency
Voltage
Speed

50 H
690 V
830 - 1,928 rpm

Gearbox

Gearbox ratio

1 planetary stage / 2 helical stages, 1:79

Rotor

Rotor

Upwind with 3 adjustable rotor blades

Rotor Speed
Weight

Variable, 10.5 - 24.4 rpm
23 Tons

Blade material

Glass fiber reinforced epoxy resin

Blade pitch control

3 independant, hydraulic activated pitch cylinders

Blade bearings

4 point ball bearing

Blade hub

Cast iron ball hub