GA-Based Transient Analysis of Single Overhead Line Terminated to Vertical-Grounded ArresterAbove Dispersive Soil under Direct lightning

In this paper, genetic algorithm-based approach for transient analysis of single overhead line connected to arrester above dispersive soil is proposed. In this approach the lightning channel striking the overhead line is first represented by a current source and this source is truncated by a finite set of frequency harmonies in time domain. Norton equivalent circuit viewed across arrester is then computed by method of Fuzzy (MoF), then applying Kirchhoff’s current low to this nonlinear circuit and analyzing it by genetic algorithm, transient voltage across the arrester is easily computed. Comparison of the achieved voltage with and without considering frequency dependence of electrical parameters of soil shows that including dispersion of soil in selecting lightning arresters is vital.Moreover, in despite of existing approaches is more efficient.

Keywords:

Arrester , overhead line , genetic algorithm