REpower 6M Offshore Wind Power

The Next Step: The REpower 6M Offshore Wind Power Plant

Is it possible to increase the yields of an offshore wind power plant by 15 percent without having to change its dimensions? It is. The solution to this challenge is to constantly refine the plants existent technology for maximum optimization. Following this principle, our engineers have used the proven 5M wind turbine as a basis for designing the 6M offshore model – and have thus developed a wind turbine with a nominal power of 6.15 megawatts and a rotor diameter of 126 meters that ranks among the most powerful offshore wind power plants in the world.

Significantly higher yield due to more constant and higher wind speed No constructional restrictions regarding height and rotor diameter Only minor operational restrictions (shadow cast, sound emission, etc.) Availability of extremely large areas

The 6M Offshore Wind Power Plant in Operation:

Ellhöft, Schleswig-Holstein, Germany (2009) Thornton Bank II & III, Belgium (2012) Eastern North Sea, Germany (2012)

TECHNICAL DATA

Rated power 6,15 MW

Rotor Diameter

126 m

100 - 117 m Onshore, 85 - 95 m

Hub Heights

Offshore

Power Control Pitch (electrical)

Rotor Speed 7,7 - 12,1 rpm (+15%)

On-board crane:

Hydraulic marine on-board crane Practically all required maintenance work can thus be carried out Large swivel range and high load capacity Can be flexibly used via remote control

Ease of maintenance:

Generous space available in the nacelle for ergonomically optimized and reliable maintenance Convenient access to the hub, regardless of the weather, without having to leave the nacelle Optimal accessibility to all components Safe maintenance work is guaranteed due to the covering of all rotating components Where required, comprehensive dismantling options on the

installation

Environment:

No leakage of lubricants from the hub and nacelle due to:

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labyrinth in the spinner, grease and oil collecting pans integrated in the main frame coaming edges in the nacelle paneling and grease pan under the azimuth gearing Closed system for the central lubrication of the blade bearings

Protection of man and machine through the shielding of all relevant

cables

Fire protection:

Fully automatic system with active detectors (for smoke and

aerosols) and flue-gas extraction in the nacelle, switchgear

cabinets and transformer room

Automatic nitrogen multi-zone extinguishing system for the electrical components CO2 and ABC fire extinguishers for manual firefighting in the

tower and nacelle

Generator / converter:

Yield-optimized variable speed range Fully enclosed generator with water/air heat exchanger Low converter losses and high overall efficiency due to the restriction of the converter output to max. 20% of the overall output Redundant converter system (reduced operation of up to 66% of the rated output is possible if a converter fails) Frame construction minimizes the oscillations and vibrations

Transformer:

Cast resin dry-type transformer with very high environmental compatibility Reduced mass and low fire risk Fully enclosed installation with air/air heat exchanger Selectable output voltages with 20, 30 and 33 kV

Gear system:

Rotor blade: 3-stage planetary helical gear system (2 x planetary gears, 1 x helical gear) Designed acc. to the REpower gear system guideline meeting the most stringent requirements in terms of service life and quiet running Optimized efficiency Improved structure-borne sound insulation Low temperature level due to an efficient oil cooling system by means of an oil/air heat exchanger Three-stage oil filtering system for maximum oil quality Integrated oil particle counter

Load-optimized, light GRP construction Outstanding lightning protection due to multi-receptor system

Tube tower:

Optimal integration of the complete electrical system, consisting of the generator, converter and transformer, into the nacelle Reliable protection against moisture and sea air due to the air/air or water/air heat exchanger Low transmission losses due to the fact that the components are located close together Components mounted using elastomer bearings for structure-borne sound insulation and vibration damping Characteristic frequency of the tower is higher than the rotor’s rotating frequency; this ensures that the tower and nacelle are minimally loaded Entire speed range of the installation can be used as there is no frequency interference

Maximum component safety via T- and L-flanges as well as via load-optimized door openings

Pitch system:

Electrical system, which is virtually maintenance-free High-quality, generously dimensioned blade bearings with a closed system for permanent lubrication High reliability due to redundant blade angle detection with two independent measurement systems High safety due to independent control and regulation systems for each rotor blade Permanent charge and status monitoring of the battery boxes

Azimuth / yaw system:

Externally geared four-point bearing, driven via generously dimensioned, high-quality gear motors Hydraulic holding brakes with hydraulic pressure reservoir (they relieve the drives when idle and stabilize the nacelle) Minimum loading of the drives due to the low friction of the four-point

bearing

Rotor hub:

Power-flow-optimized design Optimal integration of the pitch drives Generously dimensioned spinner for reliable access to the hub regardless of the weather

Rotor bearing and rotor shaft:

Double-mounted distributed drive train CARB bearing and high-quality fixed spherical roller bearing with optimally adjusted bearing housing Automatic permanent lubrication of the bearings for maximum service life

Lightning protection:

Rotor shaft cast in a power-flow-optimized manner

Lightning protection concept complies with the most stringent requirements of lightning protection class I in accordance with the IEC and GL regulations with interior and exterior lightning protection Reliable protection due to defined lightning conduits which bypass the rolling bearings GRP coupling for the galvanic separation of the generator system from the gear system Overvoltage arrester for the protection of the electrical system

Reliable protection of the generator due to insulated bearing bushings and grounding brushes

On-board crane:

Hydraulic marine on-board crane Practically all required maintenance work can thus be carried out Large swivel range and high load capacity Can be flexibly used via remote control

Servicefreundlichkeit： 易维护性

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