Distribution calculation of wind turbine low frequency electromagnetic fields

Abstract

There are numerous practical problems for which we need to know the spatial distribution of artificialy created electromagnetic fields, generated by the human due to advances in technology and widespread use of electrical devices. Low frequency electromagnetic fields around power transmission and distribution networks are time-varying quasistatic electromagnetic fields that have a conservative (non swirling) component of low frequency electric field caused by charges and low frequency swirling component of the magnetic field caused by currents. Compactization of power facilities or devices, reducing the mass of the conductors, the calculation of swirling currents or induced electromotive forces in low frequency circuits, designing of structures for a human protection from electromagnetic fields as well as designing of the facility itself, are only some of the practical issues where the knowledge about time changing of spatial distribution of electromagnetic field is essential. This paper elaborates the results of three-dimensional calculation of stationary, sinus variable low frequency electromagnetic fields of the wind turbine, with complex configuration of elements, consisting of 7 wind aggregates, rated power 1.5MW, type LTW77-1.5, the manufacturer Leitwind, in the software package EFC-400. Analyzing of these calculation results is necessary to point at possible weak spots and give a proposal for measures for elimination of the electromagnetic influences or reducing them to acceptable level.