On the Cumulative Effect of Magnetic Fields in the Deviation Zones of Overhead High Voltage Power Lines

Abstract

The magnetic fields emitted by Overhead Power Lines could be a reason for concern from the perspective of circular currents induced in the large surface parts of the human body, primarily of the trunk, an area where most vital organs are located. Our paper is dedicated to the study of the cumulative effects that are registered inside the obtuse angle having as tip a derivation tower and as sides the two consecutive alignments where the change of direction of the power line is made. The first part of the paper briefly reviews the already acquired background for measuring the magnetic field strength at the standard height of 1 m above the ground. The main elements of the simulation program made with the help of programming in CST Studio are presented. For the simulation, we used the concrete data provided by the project of the new 400 kV power line Gadalin-Suceava, Romania. To evaluate the cumulative effect, we compared the densities of circular currents induced in the trunk of a human rotational model, previously proposed and tested by the same group of authors. Conclusions have been drawn regarding the weight of the cumulative effects, which were reported both to the environment of a suspension tower of the same network and to a location at the middle of the distance between two consecutive towers. The conclusion is that at the level of 1 m above the ground the value considered as non-hazardous by the standards in force has not been exceeded. The cumulative effect introduced by the angular configuration of the power line does not exceed the increase due to lower clearance at the middle of the distance between 2 consecutive pylons.