Arrangements of overhead power line conductors related to the electromagnetic field limits

摘要

This paper deals with a few solutions for reduction of electric and magnetic field emissions caused by the overhead power lines. Calculations carried out for existing high voltage 400 kV overhead lines in Slovenia show that the emissions of electric and magnetic field at the border of overhead line right of way could be too high. For that very reason, the proposed paper, was attempted to minimize the emissions of electric and magnetic fields caused by the overhead line based on rearrangement of its line conductors. The first proposed solution is to change the sequences of conductor placements between both systems of the double-circuit overhead line. The second solution is the usage of higher overhead lines tower, while the third solution is electromagnetic field reduction based on conductor arrangements obtained in an optimization process. In the given case, optimization goal is to find that arrangement of the conductors, where the height of the tower is minimal and while the values of the magnetic and electric fields on the border of the overhead line right of way are under prescribed limits. All calculated results in this work are made for double-circuit overhead power line in the Electric Power Network of Slovenia.