Hybrid approach for modeling transient EM fields generated by large earthing systems

Abstract

A new hybrid approach is adopted in this paper for modeling the transient electromagnetic fields radiated by grounding systems under lightning strokes. This approach is based on electrical dipole theory for determining EM fields' radiation in infinite conductive medium, modified images theory, taking into account the interface in the half space and transmission line approach for determining the longitudinal and leakage currents. This model can be used to predict the transient characteristic of grounding systems because it can calculate electromagnetic field in any point of interest; it is sufficiently accurate, time efficient, and easy to apply.

Transient Magnetic Field of Energized Buried Grid

“…In this work, we propose a new hybrid approach [19][20], where three methods are summarized; analytical formula for determining electromagnetic fields radiated by electrical dipole in infinite conductive medium, modified images theory for taking in account the interface in the half space instead Sommerfeld's integrals, and transmission line theory for determining the longitudinal and leakage current.…”