Aspects of Computations of 3D Electromagnetic Fields near Power Overhead Lines

Computations of three-dimensional (3D) electromagnetic fields can presently be performed by means of a whole range of professional programs, such as COMSOL Multiphysics, ANSYS and Opera. These programs employ the finite-element method (FEM) requiring division of the computed area into volume elements of various sizes. However, a 3D mesh generation and its computation in these programs can sometimes be a problem due to a possible disproportion between the dimensions of conductors in focus and the whole computed area. In such cases, professional programs are either unable to generate a 3D mesh for the input data, or they create a 3D mesh consisting of a great number of elements, resulting in numerous degrees of freedom. This can make the computations considerably time-consuming. The aim of…