DIN EN IEC 61400-12-6:2024-08

This part of IEC 61400-12 specifies a procedure for measuring the nacelle transfer function of a single electricity-producing, horizontal axis wind turbine, which is not considered to be a small wind turbine in accordance with IEC 61400-2. This document specifies how to characterise a wind turbine's nacelle transfer function. The nacelle transfer function is determined by collecting simultaneous measurements of nacelle‑measured wind speed and free stream wind speed (as measured on a meteorological mast) for a period that is long enough to establish a statistically significant database over a range of wind speeds and under varying wind and atmospheric conditions. The standard differs from DIN EN 61400-12-1 (VDE 0127-12-1):2017-12, DIN EN 61400-12-1 Corrigendum 1 (VDE 0127-12-1 Corrigendum 1):2021-09, DIN EN 61400-12-2 (VDE 0127-12-2):2014-02 and DIN EN 61400-12-2 Corrigendum 1 (VDE 0127-12-2 Corrigendum 1):2019-07 as follows: a) the structural revision contains no technical changes with respect to IEC 61400-12-1:2017 and IEC 61400‑12‑2:2013, but the parts that relate to wind measurements, measurement of site calibration and assessment of obstacle and terrain have been extracted into separate standards.