27. Windenergietage 2018 in Linstow. 
Treffen Sie uns am 7.11.2018 im Forum 21 "Weiterbetrieb und Instandhaltung" 
- Bitte Link anklicken und dort nach BerlinWind suchen.
Visit us at booth A1.251.01 in Hall A1 at WindEnergy Hamburg, 25 - 28 September 2018, 
Hamburg, Germany - Please click here to follow the link.

Blade Angle Measurements

A high potential for optimal operation of wind turbines is linked to the correct rotor adjustment and balance. The set blade angles have a strong impact on the performance, but also on the operational loads.

The individual blade angles of the three blades are examined in order to identify and quantify relative deviations among the three blades. The absolute angles of all blades are checked to find their absolute deviation with respect to the set value required. This has impact on the energy production.

Relative blade angle deviations are the most common cause for aerodynamic rotor imbalance. At about 30% (or 60%) of the turbines the limit value for relative (or absolute) blade angles is exceeded. The suboptimal differences in the air flow around the three blades cause a harmful increase of the vibration levels and may as well reduce the power output. Noise emission is increased. According to our measurements, already relative blade angle differences of more than 0.3° lead to significant aerodynamic imbalance.

BerlinWind applies precise camera or laser based optical methods, which allow our experts to determine blade angles, accurate to within a tenth of a degree. Based on the measurement results, it is possible to adjust the blade angles and thereby reduce the vibration level significantly.