IEC 61400-2 PDF

The standard concerns most aspects of the turbine life from site conditions before construction, to turbine components being tested, [1] assembled and operated. Wind turbines are capital intensive, and are usually purchased before they are being erected and commissioned. Some of these standards provide technical conditions verifiable by an independent, third party , and as such are necessary in order to make business agreements so wind turbines can be financed and erected. It is also possible to use the IEC standard for turbines of less than m2 swept area. National Renewable Energy Laboratory participates in IEC standards development work, [3] [6] and tests equipment according to these standards.

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The standard concerns most aspects of the turbine life from site conditions before construction, to turbine components being tested, [1] assembled and operated. Wind turbines are capital intensive, and are usually purchased before they are being erected and commissioned.

Some of these standards provide technical conditions verifiable by an independent, third party , and as such are necessary in order to make business agreements so wind turbines can be financed and erected.

It is also possible to use the IEC standard for turbines of less than m2 swept area. National Renewable Energy Laboratory participates in IEC standards development work, [3] [6] and tests equipment according to these standards. During the construction and design phase assumptions are made about the wind climate that the wind turbines will be exposed to. Turbine wind class is just one of the factors needing consideration 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. Turbine classes are determined by three parameters - the average wind speed, extreme year gust, and turbulence. Because the fatigue loads of a number of major components in a wind turbine are mainly caused by turbulence, the knowledge of how turbulent a site is of crucial importance.

Normally the wind speed increases with increasing height. In flat terrain the wind speed increases logarithmically with height.

In complex terrain the wind profile is not a simple increase and additionally a separation of the flow might occur, leading to heavily increased turbulence. This is the definition in IEC edition 2. For U.

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