Electric field evaluation of 400kV overhead transmission lines on the earth surface

In recent years the living or working condition near high voltage transmission lines are the subjects of many researches due to the harmful effects of electromagnetic field on human´s health. This subject is very popular and it is now the research aim of national scientific organizations, so that the World Health Organization (WHO) has offer useful advises for the maximum time of being under electromagnetic field. That kind of organizations which are working in this subject believe that applying such as time limitations are not reliable enough and is just a discretionary act, but regarding to all this condition all of this organizations believe that living near electrical installations isn´t safe. According to this and to better evaluate electric field around of the transmission lines, the simulation and also measurement of the electric filed generated by the several 20-400kV lines have been done. The results show that both simulation and experimental results are closed and the amplitude of the electric field near to the ground is less than the safety margin as 5kV/m. In this paper, the results of two configurations of 400kV overhead transmission lines (single and double circuit) are presented.