CALCULATION OF MAGNETIC FIELD FROM TRANSMISSION LINES WITH APPLICATION FOR FUTURE 400 KV ALGERIAN NETWORK

When designing of electric line, it is necessary to dimension these installations according to the high magnetic fields. This present paper gives a method to calculate and represent the magnetic field around a three-phase line; it proposes to bring to the originator and to the owner of these works the answers elements to problems raised by this constraint i.e. the determination of the intensities of magnetic fields to knowing their calculation and their measurement.  Certain spirits also worried about a possible physiological action of the magnetic fields; to appreciate such a possibility, it should be retained that the amplitude of the fields produced by the works of transport of energy is, on the surface of ground about (1 to 10 μTesla), i.e. of the same order of magnitude as the earth’s magnetic field, in other words it is the periodic character, at industrial frequency, which differentiates it from the natural earth’s field.  We present a calculation programme based on the MATLAB which makes it possible to better analyze and to represent the transverse profile of the magnetic field under the lines. We also give examples of application of the method and program particularly applied for future 400kv Algerian network.