ABSTRACT
EHV and UHV AC transmission lines that transmit power through overhead mode require piece of land identified as right-of-ways. These are approximated in relation to the operating effects of the energized line, major focus being given to electric field effects, magnetic field strength and physical clearances. A need exists to determine the distribution of these fields in transmission pathways. Accurate computation of the maximum value of the electric field stress at ground surface is of utmost importance from the view point of human safety. In the present research work, estimation of electric field distribution and computation of magnetic field strength in vicinity of the high voltage transmission lines is carried out for EHV AC transmission lines by a newly developed computer program. It uses concept of charge simulation method (CSM) along with most fundamental Maxwell’s potential coefficient theory. Simulation results for different configurations of double circuit 765 kV EHV AC lines viz., simple vertical, delta and inverted delta configurations are presented. Profiles of Electric and Magnetic fields are plotted in lateral as well as in longitudinal directions considering catenary effect. Also 3D modelling of lines is carried out and resultant electric and magnetic field profiles along one span of lines are shown. Design optimization is also attempted for minimizing right of way along the length of transmission line.
