Download Wind turbines – Part 1: Design requirements by IEC TC/SC 88 PDF

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Specifies crucial layout specifications to make sure the engineering integrity of wind generators. offers a suitable point of safety opposed to harm from all dangers throughout the deliberate lifetime. is worried with all subsystems of wind generators equivalent to keep an eye on and security mechanisms, inner electric platforms, mechanical structures and aid constructions. Applies to wind generators of all sizes. See IEC 61400-2 for small wind generators.

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Extra resources for Wind turbines – Part 1: Design requirements

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Partial safety factor for loads The values of γ f shall be chosen from Table 3. • Partial safety factor for the elastic properties of materials The value of γ m shall be 1,1 except when the elastic properties of the component in question have been determined by full-scale testing and monitoring in which case it may be reduced to 1,0. Particular attention shall be paid to geometrical uncertainties and the accuracy of the deflection calculation method. • Partial safety factor for consequences of failure Component class 1: γ n = 1,0 Component class 2: γ n = 1,0 Component class 3: γ n = 1,3.

The wind models shall be based on the reference wind speed, V ref , and a fixed turbulence standard deviation, σ 1 . For the steady extreme wind model, the extreme wind speed, V e50 , with a recurrence period of 50 years, and the extreme wind speed, V e1 , with a recurrence period of 1 year, shall be computed as a function of height, z, using the following equations:  Ve50 ( z ) = 1, 4 Vref  z   zhub  and Ve1 ( z ) = 0, 8 Ve50 ( z ) 0 ,11 (12) (13) In the steady extreme wind model, allowance for short-term deviations from the mean wind direction shall be made by assuming constant yaw misalignment in the range of ±15º.

2 Control functions The control functions of a wind turbine shall control the operation by active or passive means and keep the operating parameters within their normal limits. Where selection of control mode can be exercised, for example for maintenance, each mode shall override all other control, with the exception of the emergency stop button. Mode selection shall be governed by a selector, which can be locked in each position corresponding with a single mode. When certain functions are controlled numerically, access codes shall be provided to appropriately select the function.

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