Transient Analysis of Single-Conductor Overhead Lines Terminated to Grounded Arrester Considering Frequency Dependence of Electrical Parameters of Soil using Genetic Algorithm

Document Type : Original Article

Abstract

In  this  paper,  a  genetic  algorithm-based  approach  for  transient  analysis  of  single-conductor  overhead  line
connected  to  grounded  arrester  is  proposed.  In  analysis,  the  grounding  systems  are  buried  in  lossy  dispersive
soil,  i.e.,  the  electrical  parameters  of  soil  are  frequency-dependent. In  dealing  with  the  problem,  the  lightning
current pulse is first approximated by a finite set of sinusoidal harmonies in a time domain. Norton equivalent
circuit  viewed  across  the  arrester  is  then  computed  via  transmission line  model  (TLM).  Finally  analyzing  this
nonlinear circuit by genetic algorithm, transient voltage across the arrester is easily computed. Comparison of
the  achieved  transient  voltages  with  and  without  considering  dispersion  of  soil  shows  that  this  effect plays  an
important  role  in  selecting  lightning  arresters  and  the  insulation  coordination  study  of  power  systems.
Moreover, in comparison with arithmetic operator method (AOM), the run-time is reduced.

Keywords

References

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History

  • Receive Date: 19 October 2016
  • Revise Date: 06 March 2019
  • Accept Date: 19 September 2018
  • Publish Date: 23 July 2015

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