Turbine wind class

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Turbine wind class
Turbine wind class is just one of the factors which need to consider during the complex
process of planning a wind power plant. Wind classes determine which turbine is suitable for
the normal wind conditions of a particular site. They’re mainly defined by the average annual
wind speed (measured at the turbine’s hub height), the speed of extreme gusts that could
occur over 50 years, and how much turbulence there is at the wind site.
The three wind classes for wind turbines are defined by an International Electrotechnical
Commission standard (IEC), and correspond to high, medium and low wind as follows:
Turbine Class
Annual average wind
speed
Extreme 50-year gust
Turbulence classes
IEC I High
Wind
IEC II Medium
Wind
IEC III Low
Wind
10 m/s
8.5 m/s
7.5 m/s
70 m/s
A 18%
B 16%
59.5 m/s
A 18%
B 16%
52.5 m/s
A 18%
B 16%
Onshore
Turbine / IEC Wind Class IEC I High Wind IEC II Medium Wind IEC III Low Wind
V52-850 kW
X
X
V60-850 kW
X
X
V82- 1.65 MW
X
X
V80-2.0 MW
X
V90-1.8 MW
X
V90-2.0 MW
X
V100-1.8 MW
X
V90-3.0 MW
X
X
V112-3.0 MW
X
X
Offshore
Turbine / IEC Wind Class IEC I High Wind IEC II Medium Wind IEC III Low Wind
V90-3.0 MW Offshore
X
X
V112-3.0 MW Offshore
X
X
Source: www.vestas.com
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