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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Turbine classes are determined by three parameters – the average wind speed, extreme year gust, and turbulence.
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Retrieved 7 October Small wind turbines are defined as being of up to m 2 swept area and a somewhat simplified IEC standard addresses kec. Turbine wind class is just one of the factors needing iex during the complex process of planning a wind power plant.
The common set of standards sometimes replace the various national standards, forming a basis for global certification. Languages Deutsch Edit links. Retrieved from ” https: Wind turbines are designed for specific conditions. The is a set of design requirements made to ensure that wind turbines are appropriately engineered against damage from hazards within the planned lifetime. 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.
Normally the wind speed increases with increasing height. 6140-03
Wind classes determine which turbine is suitable for the normal wind conditions of a particular site. Please help to improve this article by introducing more precise citations. Retrieved 14 March Turbulence intensity quantifies how much the wind varies typically within 10 minutes. Views Read Edit View history. From Wikipedia, the free encyclopedia. Archived from the original on 7 October Webarchive template wayback links Articles lacking in-text citations from March All articles lacking in-text lec Use British English Oxford spelling from January The standard concerns most aspects of the turbine ief from site conditions before construction, to turbine components being tested,  assembled and operated.
Because the fatigue loads of a number of major components in a wind turbine are mainly caused by turbulence, the knowledge of how iiec a site is of crucial importance. List of International Electrotechnical Commission standards. An update for IEC is scheduled for This article includes a list of referencesrelated reading or external linksbut its sources remain unclear because it lacks inline citations. IEC started standardizing international certification on the subject inand the first standard appeared in Wind turbine classes” Vestas.
This page was last edited on 26 Septemberat National Renewable Energy Laboratory participates in IEC standards development work,   and tests equipment according to these standards.
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, 614000-3 partyand as such are necessary in order to make business agreements so wind turbines can be financed and erected.
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. In flat terrain the wind speed increases logarithmically with height.
This is the definition in IEC edition 2. March Learn how and when to remove this template message. The extreme wind speeds are based on the 3 second average wind speed. For small wind turbines the global industry has been working towards harmonisation of certification requirements with a “test once, certify everywhere” objective.