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. During the assessment of the electromagnetic emissions of wind turbines(WTs), the aspects of measurement uncertainty must be taken into account.Therefore, this work focuses on the measurement uncertainty which arisesthrough distance errors of the measuring positions around a WT. The measurement distance given by the corresponding standard is 30  m withrespect to the WT tower. However, this determined distance will alwaysdiffer e.g. due to unevenness of the surrounding ground, leading tomeasurement uncertainties. These uncertainties can be estimated with theknowledge of the electromagnetic field distribution. It is assumed instandard measurements, that the electromagnetic field present is a puretransversal electromagnetic field (far field). Simulations of a simplifiedWT model with a hub height of 100  m shows that this assumption is noteffective for the whole frequency range from 150  kHz to 1  GHz . Forfrequencies below 3  MHz the field distribution is monotonically decreasingwith the distance from the WT since it behaves like an electrical smallradiator. Whereas for frequencies above 3  MHz , where the investigated modelforms an electrical large radiator, the field distribution becomes morecomplex and the measurement uncertainty of the field strength at theobservation point increases. Therefore, this work focuses on investigationswhere the near field becomes a far field. Based on the simulation results, amethod for minimizing the uncertainty contribution caused by distance errorsis presented. Therefore, advanced measurement uncertainty during in situtest of WTs can be reduced.

Measurement uncertainty caused by distance errors during in situ tests of wind turbines