The induced magnetic field calculation of three phase overhead transmission lines above a lossy ground as a frequency-dependent complex function

This paper presents a calculation of the induced magnetic field which is generated by high voltage, super-high voltage and extra high voltage transmission lines. The frequency-dependent model considers self and mutual impedances of transmission lines, taking into account the influence of bundled conductors using a sag in one span, ground-return path with earth resistivity which is as a frequency-dependent complex function. Analysis results obtained with 110 kV; 230 kV; 500 kV and 765 kV lines are presented by means of graphs.