vman

Hi everyone, A short question on the IEC classes as defined in 61400-1 Ed3. The values for the turbulance that are defined as 12%, 14% and 16% are the top or bottom limits for a class? Say a class B would be from 14% to 16% or from 12% to 14%? Also, I have the same doubt about the wind speed defined as 0,2Vref in the Ed3 standard. In case of the Ed3 standard these values would only represent the mean values for a wind speed distribution and not the up and bottom class limits, correct? That is to say that if a mean wind speed is 8 m/s that does not necessarily mean the site Class 2(if 0,2Vref for this case is 6 m/s for example). Thanks.

Hello. What additional information does a Reference Site give to the Wind Farm hierarchy member, so that without it no Wind Farm power curve can be calculated? It´s not the point on the map at which the speeds should be taken for the wind turbine site calculations, is it? I assumed that since dRIX value at each turbine site within a Wind Farm is in any case relative to the met. mast than each turbine site should be using wind speeds at the point where is it located. Otherwise dRIX value should have been relative to the Reference Site. Thank you, expecting a prompt reply! P.S. I had written a long post with a few questions in it, but while I was writing it the system logged me out so when I clicked on submit I lost all the questions I had put out. That could be very frustrating) Could you extend the log out time a little please?