Abstract: Such systems should be structured according to the high magnetic fields when designing high voltage power transmission lines. This paper proposes a method for computing and illustrating the magnetic field profile along a three-phase high voltage overhead power line; It proposes to take the aspects of the issues caused by that restriction to the owner of those appears to be working: Calculate the magnetic field intensities in order to know their calculation and measurement. Many spirits asked about this possible physiological action of the magnetic fields. In order to understand this probability, the intensity of the fields produced by transport energy works must be retained; In this work, a method for the evaluation of 50Hz magnetic fields produced by overhead power lines is presented. In the magnetic field calculation, the non -uniform trajectory character described by the conductors between towers, Catenary drawing is known. Using this method, a program for calculation the magnetic field intensity was produced. It can handle any power line geometry. This paper presents a simulation methodology for analyze the distribution of the magnetic field generated by high voltage under three phase overhead transmission line. The effect of sag due to the weight of the line on the values of the magnetic field on ground level has also been discussed. We also give examples of application of the method and program. The analytical results of the calculation of 275kV three-phase transmission line based on image method and obtained by MATLAB numerical software which makes it possible to better analyze and to represent the transverse profile of the magnetic field intensity under and in the vicinity of high voltage overhead electric power transmission lines.

Key words: Magnetic field, energy, extremely low frequency, high voltage, overhead transmission line, 2D computation.