High frequency current distribution in horizontal grounding systems in two-layer soil

This paper presents the ongoing research results of the high frequency grounding system analysis in two-layer soil structure. On the basis of rigorous electromagnetic field theory, which involves Sommerfeld´s integrals, the mathematical model is formulated by the mixed potential integral equation (MPIE). Detailed analysis of a high frequency performance of a typical short and long horizontal grounding conductor placed in the upper layer is given. It is shown that because of the presence of two distinct layers the current distribution is not only function of frequency, but also a function of the reflection factor and the upper layer height