Modeling and design of magnetic shields for electrical Installations

Nowadays, the issue of human exposure to electric and magnetic fields is still of worldwide interest [1] [2]. Several institutions investigated this problem trying to define as precisely as possible the effect of the electromagnetic field on the human health. One of the most relevant institution is the International Commission on Non-Ionizing Radiation Protection (ICNIRP) [3]. It is the view of ICNIRP that there is no currently existing scientific evidence that prolonged exposure to electromagnetic field produces possible long-term effect [4], [5]. Therefore, it focused the attention only on the well-established relations between short term direct biophysical effects producing guidelines that suggest the proper limit depending on the field frequency or on the shape of pulsing magnetic field [6] . These limitations are also published in the European Directive 2004/40/EC, [7] that regulates the maximum admissible levels for professional exposures. On the other hand, the protection of population is not homogeneous [2], [8], [9] but, usually a higher degree of safety is introduced considering stricter limits. For the above reasons the emissions of the electrical infrastructures for electricity distributions need to be analyzed.