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Analysis of the Influence of Soil Stratification Models on Different Grounding System Configurations

  • George R. S. LiraEmail author
  • Matheus R. Alves
  • André Igor Nóbrega
  • Arthur Francisco Andrade
  • Edson G. Costa
  • Rômulo O. Teixeira
Conference paper
Part of the Lecture Notes in Electrical Engineering book series (LNEE, volume 598)

Abstract

Grounding has great importance in power electrical systems. The main parameter to evaluate its performance is the impedance, which can be estimated in the design stage using the conductors geometry and a soil stratification model based on measures of soil resistivity. In this context, this work performed a comparative analysis of one-layer and two-layer stratification models. The frequency response associated to each of the soil models considered was calculated for two different grounding systems and used to obtain the grounding response to a 8/20-\(\upmu \)s current impulse. Differences of up to 44% were obtained for impedance at low frequency, and it was verified that the homogeneous soil model underestimates grounding impedance. That may lead to a worse-to-expected performance during short-circuit or lightning. It can be concluded that the modeling of the soil with the homogeneous model is discouraged when designing a grounding system for substations.

Keywords

Grounding systems Soil stratification Finite element method 

Notes

Acknowledgments

To light SA (Brazilian power utility) by support this research in the scope of ANEEL (Brazilian regulation agency) R&D program. To the High Voltage Laboratory of Federal University of Campina Grande by provide the necessary infrastructure.

References

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  • George R. S. Lira
    • 1
    Email author
  • Matheus R. Alves
    • 1
  • André Igor Nóbrega
    • 1
  • Arthur Francisco Andrade
    • 1
  • Edson G. Costa
    • 1
  • Rômulo O. Teixeira
    • 2
  1. 1.Federal University of Campina GrandeCampina GrandeBrazil
  2. 2.Light SA (Brazilian Power Utility)Rio de JaneiroBrazil

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