Analysis of Overvoltages Resulting from Atmospheric Discharges for Frequency-Dependent Soils

In collaboration with the IV Peruvian-International Engineering Research Conference

Authors

Keywords:

Electromagnetic transients, Grounding systems, Grounding impedance, Lightning stroke, Soil parameters

Abstract

This paper presents a comparative analysis of the electrode impedance for a vertical rod buried in a homogeneous ground where the soil electrical parameters (resistivity and permittivity) are frequency-dependent in relation to the impedances obtained with frequency-constant parameters. In this study, it is taken into account that vertical rod can be seen as a short transmission line whose electrical parameters (resistance, inductance, capacitance and conductance) are distributed along its length. Thus, the rod impedance is computed as being the harmonic impedance of the transmission line as a function of frequency. Once the rod impedances are obtained, and using the Vector Fitting technique, equivalent electrical circuits are obtained directly in time domain. The advantage of this type of representation is that equivalent circuit can be easily incorporated into EMTP-type programs for the electromagnetic transient analysis. In this model, the grounding potential rise (GPR) generated due to a lightning stroke at the rod can be calculated. Additionally, an impulsive current source, representing a lightning stroke, is injected at the top of a transmission tower whose the grounding system is composed by a vertical rod, and the transient voltages at the cross-arms and tower base are calculated. The results show that the voltages are significantly modified by the presence of the soil with frequency-dependent parameters, especially their voltage peaks, and that an accurate analysis of the transient in power systems must take this phenomenon into account.

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Author Biography

Jaimis Sajid Leon Colqui, Facultad de Ingeniería Eléctrica, Universidad Estadual Paulista "Júlio de Mesquita Filho", UNESP, Ilha Solteira-Brasil.

Egresado de la carrera de Ingeniería Eléctrica de la Universidad Nacional de Ingeniería (UNI), Perú. Estudios culminados de Maestría en Sistemas Eléctricos de Potencia en la Universidad Estatal Paulista Júlio de Mesquita Filho (UNESP), Brasil. Actualmente es investigador de Doctorado en Brasil.
Con experiencia en el desarrollo de Estudios de Planeamiento de Sistemas Eléctricos de Potencia. Estudios de modelos de Líneas de Transmisión para Análisis de Transitorios Electromagnéticos en Sistemas de Potencia y Estudios de Generación Distribuida Fotovoltaica en Redes de Distribución Eléctrica.

References

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Published

2020-11-28

How to Cite

[1]
J. S. Leon Colqui, S. Kurokawa, A. R. Justo de Araújo, and J. Pissolato Filho, “Analysis of Overvoltages Resulting from Atmospheric Discharges for Frequency-Dependent Soils: In collaboration with the IV Peruvian-International Engineering Research Conference”, TEC, vol. 30, no. 2, pp. 57–63, Nov. 2020.

Issue

Vol. 30 No. 2 (2020)

Section

Renewable energy, electrical engineering and / or power systems

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