Distribution of magnetic field of power lines with different configurations

Traditionally, magnetic field computation techniques assume that the current carrying power line conductors are straight horizontal wires of equal height. In fact, the catenary effect, difference of tower heights and the time variation of current are neglected; therefore, the computation results are normally far from reality. In this paper, magnetic field distribution under overhead power lines is computed, considering towers with unequal heights, the catenary effect, different number of conductors and various configurations. Meanwhile, the influence of time-varying current upon the magnetic field is studied