Transient grounding behavior considering frequency-dependent soil parameters: Field versus transmission line theories

This paper presents a study on the transient behavior of grounding conductors. Two important physical quantities are analyzed: the harmonic impedance and the ground potential rise (GPR). For the determination of such quantities, two theories widely used in the literature are used: one based on field...

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Bibliographic Details
Published in:	2017 IEEE 3rd Global Electromagnetic Compatibility Conference (GEMCCON) pp. 1 - 5
Main Authors:	Schroeder, Marco A. O., Amaral, Amanda B., Moura, Rodolfo A. R., Barros, Maria T. C., Lima, Antonio C. S.
Format:	Conference Proceeding
Language:	English
Published:	IEEE 01-11-2017
Subjects:	Conductivity Conductors Field and Transmission Line Theories First Stroke Currents Frequency-Dependent Soil Parameters Grounding Grounding Harmonic Impedance Grounding Potential Rise Lightning Power system transients Soil Transient Grounding Behavior Transmission line theory
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Summary:	This paper presents a study on the transient behavior of grounding conductors. Two important physical quantities are analyzed: the harmonic impedance and the ground potential rise (GPR). For the determination of such quantities, two theories widely used in the literature are used: one based on field computation and the other based on transmission line theory. The first requires high computational time, while for the second this time is greatly reduced. Two geometric configurations (one horizontal electrode and four counterpoises) are considered. Soil parameters are modelled as constant and frequency-dependent. The results show that transmission line theory should be used with care, since for soils with high resistivities and frequency-dependent parameters the results may differ from those generated by the field theory.
DOI:	10.1109/GEMCCON.2017.8400664