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5.1.3 Rotation seed Dramatically Decreases
Wind turbine rotation speed dramatically decreases under heavy wind condition, which can be mainly divided into normal deceleration and
abnormal deceleration:
1) Turbine normal deceleration is due to wind turbine over-speed protection, for example, dump load, electromagnetic braking and blades
aerodynamic braking. These are regular protection ways to protect the wind turbine and the whole system in high wind.
2) Turbine abnormal deceleration is mainly due to friction between rotor and stator, bearing damaged, generator burned, blades deformation
or damaged, turbine or pole shake heavily, in case of these situations, please disconnect wind turbine from controller and put three-phase in
short circuit mode, then contact supplier to solve the problem.
5.1.4 Generator Abnormal AC Output
1) Generator abnormal which is due to long connecting wire or small wire size which results in high pressure drop, therefore, selection of wire
size should refer to 6.5 regulations and requirements.
2
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Check if the wind turbine three-phrase output performs well, check the voltage of each two of the output phases are balanced.
3) Generator three-phase output voltage is imbalanced. Voltage unbalanced rate shall not exceed 10% (same wind speed or rotational speed)
in accordance with related national standards, if exceeded, the generator fails, please contact supplier to solve the problem.
4) Generator has no output voltage under heavy wind condition, check whether generator is under short-circuit mode or not (reference: 5.2)
and three-phase resistance values is balanced or not (uncharged operation), if imbalanced, the generator fails, please contact supplier to solve
problems.
WARNING:
Never check the wind turbine while the blades are spinning or on a windy day.
5.1.5 Abnormal Noise
1) Friction between rotor and stator, or bearing damaged - please contact supplier to solve the problem.
2) Check if wind turbine is rotating abnormally, or noise generated by self-vibration.(reference:5.1.1)
