Calculation of a grounding grid in multi-layer medium

The complex image method is recently used to calculate accurate grounding parameter of grounding systems with any form in non-homogeneous soil. This paper approaches the algorithm of the complex image method. By applying the concept of symmetry to data processing, computational effort and memory requirements are reduced greatly. Moreover, based on Matlab, the universal program for calculation of grounding parameter of a grounding system in two-layer soil is accomplished, which has high speed and satisfied accuracy.