ASSESSMENT OF EMF EXPOSURE CONDITIONS NEAR TRANSMISSION LINES

Increasing public concern about human exposure to EMFs is posing Power Utilities in Brasil several complex problems. Existing limits, expressed in International Standards, are based on maximum admissible fields or induced Currents inside human bodies. Since those physical quantities cannnot be readily measured, they must be estimated using techniques of computational dosimetry, based on computational modeling of human bodies. Nowadays the models available for Human body simulation (FEM, FDM,...) are quite accurate, however the determination of tissues characteristics (permittivity and conductivity) and the simulation of induced currents on real transmission line conditions require some developments. In this paper a research designed to characterize, using indirect methods, the permittivity of the human body, and the modeling of live line workers on real field conditions (simultaneous electric and magnetic non-uniform fields) is presented.