Electromagnetic interference (EMI) can both affect and be transmitted by mega-watt wind turbines. This paper provides a general overview on EMI with respect to mega-watt wind turbines. Possibilities of measuring all types of electromagnetic interference are shown. Electromagnetic fields resulting from a GSM transmitter mounted on a mega-watt wind turbine will be analyzed in detail. This cellular system operates as a real-time communication link. The method-of-moments is used to analytically describe the electro-magnetic fields. The electromagnetic interference will be analyzed under the given boundary condition with a commercial simulation tool. Different transmitter positions are judged on the basis of their radiation patterns. The principal EMI mechanisms are described and taken into consideration.

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Electro-magnetic fields resulting from a GSM transmitter mounted on a large wind turbine will be analyzed. This cellular system operates as novel communication backup in case the standard communication between operator and hub control systems is interrupted. The method-of-moments is used to analytically describe the electro-magnetic fields caused by a GSM 900 MHz transmitter mounted on the hub of a wind turbine. Using a commercial simulation tool the electromagnetic field distribution will be analyzed to determine an optimized wireless communication link to a base station. Different transmitter positions are evaluated based on their radiation patterns. Scattering and diffraction by the turbine's rotation is taken into account.

According to the Lightning Protection Institute in the USA, lightning damage is the single largest cause of unplanned downtime in wind turbines. The damages can either be caused by direct effects on the structure, or by indirect effects on the system's electronics. Hence, enhanced efforts on the improvement of the lightning protection system of wind turbines have been undertaken to reduce both effects. Therefore, electromagnetic analysis of different elements of the turbine is performed. In order to verify these simulations and to specify the need for shielding inside the turbine elements, the lightning induced field inside the different elements has to be measured and reviewed. In this paper we present a novel approach for potentialfree magnetic field measurements, using fiber optic magnetic field sensors based on magnetic garnets. These sensors feature a broad frequency range, an inherent galvantic isolation as well as a low weight.