Dzhankeldy Wind Power Project

H
UB
 
The hub is a cast construction with a combination of star type and ball type. The nacelle 
elevation angle, cone angle and blade preflex are used to ensure that the minimum distance 
between blade tips and the tower meets safety requirements.
Figure 2-16 Outline of Hub 

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Dzhankeldy 500MW Wind Farm 
ESIA Volume 2- Main Text, Tables & Figures 
54 
Source: Envision EN 171/6.5 Wind Turbine Specifications
N
ACELLE 
 
The nacelle houses the generator and gearbox. The nacelle is equipped with control cabinet, 
hoist, yawing system, drive chain system etc.. 
Figure 2-17 Outline of Nacelle 
Source: Envision EN 171/6.5 Wind Turbine Specifications

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Dzhankeldy 500MW Wind Farm 
ESIA Volume 2- Main Text, Tables & Figures 
55 
B
RAKE 
S
YSTEM 
 
The primary braking method for the WTG is aerodynamic braking which is realised by three-
blade pitch control. This braking system will work under various operating conditions such as 
normal shutdown, overspeed shutdown, emergency shutdown, etc. During aerodynamic 
braking, the pitch control keeps the wind roto in a safe operating speed range. 
Supercapacitors supply power to three pitch systems individually and independently thus 
enabling individual and independent pitch control. In addition, a high-speed caliper is 
installed at the gearbox high speed shaft (HSS) end as an auxiliary brake for the whole 
machine. 
After aerodynamic braking realised by pitch control reduces the speed of wind rotor to a 
certain range, the high-speed brake caliper at the gearbox HSS end acts to lock the drive 
chain. Based on EHS requirements, an all-round protective cover for HSS end is designed to 
ensure personal safety.