Current Distribution and Magnetic Fields in Complex Structures Using Comsol Multiphysics

S. F. Madsen, and C. Falkenstrøm Mieritz ApS
Lejre, Denmark

The present paper presents numerical calculations of the magnetic fields and the current distribution within a wind turbine nacelle. The results are used by control system engineers designing panels and cables, who must ensure that the immunity of the equipment complies with the environment within the turbine.

Since the release of the International standard concerning lightning protection of wind turbines, IEC 61400-24, it has become mandatory to document the effectiveness of the installed lightning protection system. In this respect, numerical modelling of magnetic fields and current distribution is a natural part of establishing the zoning concept, also required in the GL2010. The computations have been conducted on an arbitrary turbine, to illustrate which kinds of results that can be obtained.