GB/T 46247-2025 Active

IEC 61400-50 specifies the methods and requirements for using instruments to measure wind speed (and related parameters, such as wind direction and turbulence intensity). For wind energy and wind turbine technologies described in other documents in the IEC 61400 series (such as resource assessment and wind turbine testing), these measurement values are required as inputs for some evaluation and testing procedures. This document is specifically applicable to ground-based remote sensing wind measurement instruments, i.e., devices that measure wind at a location above or far from the instrument installation site (such as ultrasonic radars and vertical profiling radars). This document explicitly excludes other remote sensing device types, such as forward-looking or scanning radars. This document specifies the following content:
a) Procedures and requirements for grading ground-based remote sensing devices, used to evaluate the uncertainty of the remote sensing device's sensitivity to meteorological conditions that change between the location and time of the remote sensing device's calibration and the use case (specific measurement activities);
b) Procedures and requirements for calibrating remote sensing devices;
c) Evaluation of the uncertainty of wind speed measurements;
d) Additional checks of the remote sensing device's performance and measurement uncertainty during specific measurement activities;
e) Application of the wind speed uncertainty derived from remote sensing device calibration and grading to the measurement results during specific measurement activities (e.g., interpolating the uncertainty or calibration results to different heights);
f) Reporting requirements.