Electromagnetic field measurement on high voltage overhead lines

Whether in as much as the electric field is concerned it has been settled by the international scientific community since the 90's that there are no direct biological effects, only physiological effects caused by densities of the currents higher than 10 mA/sqm induced into the human body. When considering the impact of the magnetic component of the electromagnetic field of industrial frequency, the situation is somehow different. The maximal values recommended for the magnetic flux density in professional and residential exposure situations have been established by international and national organizations. ICNIRP, IEEE and the European Community propose the limit of 100μT and 500 μT for the residential exposure and the quasi-permanent professional exposure, respectively. Higher values of the limit are accepted in case of a short time professional exposure. Some measurements where done on the usual towers in Romanian transmission grid. On the other hand, on the same type of towers, a mathematical model was developed and some simulations where done, using computers. The results where compared and the theoretical method is validated. For final conclusions some protective measures against the field action should be proposed.