Numerical methods for induced voltage evaluation in electromagnetic interference problems

A numerical procedure employing the finite-difference method (FDM) is used in order to calculate the induced voltages across points on a underground pipeline, running parallel to a faulted line, and remote earth. A comparison is made between the results obtained with FDM and FEM. We develop a mathematical differential model and based on contour integral method was obtained the numerical form of the Helmholtz equation. We determine directly the numerical form of equation for non-homogeneous media, to clearly put in evidence the electromagnetic phenomena. A physical model for experimental calculus of induced voltage in an underground pipeline will be created based on the differential numerical model.