Electromagnetic Fields of Energized Conductors in Multilayer Soils

This paper discusses the computation of electromagnetic fields due to energized thin-wire conductors in a horizontal multilayer soil. The computation uses a full wave solution for the Hertz vector potential caused by an electric dipole located in the soil or in the air. The soil layers can have arbitrary resistivity, permeability, permittivity, and thickness. The field generated by a linear conductor is obtained by integrating the contribution of dipoles along the conductor. The field of an arbitrary conductor network is obtained by superposition of the contribution of all the network conductors. Both energized conductors and the calculation points can be in the air or in the soil. Numerical results are shown for several examples using a four layer soil. The results obtained with the new method are in good agreement with the analytical result for a uniform soil results in the limiting case where the resistivity of all soil layers is the same