Improving Adaptive Algorithm to Reduce Grounding System Impedance Computing Time

The pulse of lightning strike is modeled with its frequency components from zero to several megahertz, where ground impedance in the band is a function of frequency. Different methods for implementing the exact model of the earth system in the electromagnetic transients of electrical equipment are presented. To do this, the admittance matrix from the different ports of the grounding system must be accurately calculated at this frequency band. To achieve this goal, Maxwell equations are solved using numerical methods such as the method of moments (MOM). However, numerical methods for analyzing the grounding system, especially for large earth networks, are very difficult and time consuming. In addition, if programs, such as Electromagnetic Transient Program (EMTP), that model the grounding system accurately to calculate the earth's admittance matrix is not fast enough, it won't be applicable. The purpose of this paper is to reduce the time of calculating earth impedance. To do this, we intend to improve the comparative algorithm to reduce the computational time. The results prove significant superiority of the proposed method compared to existing ones.