There has been apprehension about the possible adverse health effects
resulting from exposure to power frequency magnetic field, especially in the
overhead power lines vicinity. Research work on the biological effects of
magnetic field has been substantial in recent decades. Various international
regulations and safety guidelines, aimed at the protection of human beings,
have been issued. Numerous measurements are performed and different
numerical algorithms for computation of the magnetic field, based on the
Biot- Savart law, are developed. In this paper, a previously developed 3D
quasistatic numerical algorithm for computation of the magnetic field (i.e.
magnetic flux density) produced by overhead power lines has been improved in
such a way that cylindrical segments of passive conductors are also taken
into account. These segments of passive conductors form the conductive
passive contours, which can be natural or equivalent, and they substitute
conductive passive parts of the overhead power lines and towers. Although,
their influence on the magnetic flux density distribution and on the total
effective values of magnetic flux density is small, it is quantified in a
numerical example, based on a theoretical background that was developed and
presented in this paper.
The influence of conductive passive parts on the magnetic flux density produced by overhead power lines