Method of moments in analysis of grounding systems

An accurate computation of grounding resistance and surface potential distribution of grounding systems is a prerequisite for the qualitative and reliable design. Numerical calculation of static current field of grounding system based upon the method of moments and the application of the one-dimensional line elements is described here. We approximate unknown source function by high order polynomial shape functions, and we apply Euler–Maclaurin summation formula for calculation of the infinite series in a case of double-layer earth structure. An analysis of computation accuracy in point matching and Galerkin's method is presented as well.