NG Twelve-Five

The hub contains the device for varying the pitch of the blades. Contrary to most other small wind energy converters the NG TWELVE-FIVE features the pitch control system of the blades giving the advantages of:

• Automatic restarting after grid failure
• No shutdown in strong winds
• Constant frequency in stand-alone operation

The fiberglass rotor blades are aerodynamically formed according to the profile NACA 4424-4415. The rotor drives a generator through a three-stage spur gearing. A spring-loaded disc brake is located between the rotor and the rotor bearing. The hydraulic control devices are contained in a single block mounted on the generator housing. The rotor bearing and the generator are flange-mounted to the gearbox, which in turn is connected to the wind tracker via a pedestal. The wind tracking system is vane-driven via worm gearing.

The tower is of octagonal tubular steel construction. The electronic safety and control devices, together with relevant instrumentation are housed in a switch cabinet on the tower pedestal. This switch cabinet also contains the power terminals for connecting the NG TWELVE-FIVE to the grid or to the consumer loads.

Advantages of the NG TWELVE-FIVE:

• Fully Automatic operation in grid connected operation
• Automatic restart after grid failure
• Thoroughly field tested, fail safe design
• Easy to assemble
• Easy to maintain
• High level of reliability
• Design lifetime over 20 year

Safety Devices:

• Manual cut-off
• Over speed protection
• Vibration detector
• Grid-failure contact breaker
• Electronic start-up control

Safety devices

• Manual cut-out by opening of the hydraulic circuit
• Electronic and mechanical over speed shutdown
• Emergency cut-off and maintenance blocking by means of an integrated disk brake
• Whole system in accordance with the German Standards VDE and DIN
• Vibration detector