This British Standard is the UK implementation of EN The text of the International Standard IEC was approved. Buy IEC Ed. Wind turbines Part 3: Design requirements for offshore wind turbines from SAI Global. The text of document 88//FDIS, future edition 1 of IEC , turbines, was submitted to the IEC-CENELEC parallel vote and was.
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The is a set of design requirements made to ensure that wind turbines are appropriately engineered against damage from hazards within the planned lifetime. The standard concerns most aspects of the turbine life from site conditions before construction, to turbine components being tested,  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 partyand as such are necessary in order to make business agreements so wind turbines can be financed and erected.
IEC started standardizing international certification on the subject inand the first standard appeared in The common set of standards sometimes replace the various national standards, forming a basis for global certification.
Small wind turbines are defined as being of up to m 2 swept area and a somewhat simplified IEC standard addresses these. It is also possible to use the IEC standard for turbines of less than m 2 swept area.
National Renewable Energy Laboratory participates in IEC standards development work,   and tests equipment according to these standards.
In Canada, the previous national standards were outdated and impeded the wind industry, and they were updated and harmonized with by the Canadian Standards Association with several modifications.
An update for IEC is scheduled for For small wind turbines the global industry has been working towards harmonisation of certification requirements with a “test once, certify everywhere” objective.
Wind turbines are designed for specific conditions.
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 ifc, extreme year gust, and turbulence. Turbulence intensity quantifies how much the wind varies typically within 10 minutes.
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. The extreme wind speeds are based on the 3 second average wind speed. This is the definition in IEC edition 2.
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Archived from the original on 7 October Retrieved 7 October Wind turbine classes” Vestas. Basic Aspects” Suzlon Energy. Retrieved 18 March Retrieved 14 Kec List of International Electrotechnical Commission standards.
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