Fast Calculation of the Green Function of a Point Current Source in a Horizontal Layered Soil With a New Complex Path and Its Application in Grounding System

It is very important to efficiently evaluate the Green function of a point current for analyzing a large grounding system. In this paper, a very efficient approach to calculate the Green function of a point current source in a horizontal layered soil with a new complex integration path is presented. As can be found, the highly oscillatory integrand has been changed to be a quickly damped one that can be evaluated using the built-in quadrature routine in MATLAB. The numerical examples show that it is practical to evaluate the parameters of a large ground system within a reasonable computational time with the proposed approach.