Transient Analysis of Multiphase Transmission Lines Located above Frequency-Dependent Soils

Tainá Fernanda Garbelim Pascoalato, Anderson Ricardo Justo de Araújo, Pablo Torrez Caballero, Jaimis Sajid Leon Colqui and Sérgio Kurokawa
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Tainá Fernanda Garbelim Pascoalato: Department of Electrical Engineering, São Paulo State University (UNESP), Ilha Solteira 15.385-000, Brazil
Anderson Ricardo Justo de Araújo: School of Electrical and Computer Engineering, State University of Campinas (UNICAMP), Campinas 13.083-872, Brazil
Pablo Torrez Caballero: Department of Electrical Engineering, São Paulo State University (UNESP), Ilha Solteira 15.385-000, Brazil
Jaimis Sajid Leon Colqui: Department of Electrical Engineering, São Paulo State University (UNESP), Ilha Solteira 15.385-000, Brazil
Sérgio Kurokawa: Department of Electrical Engineering, São Paulo State University (UNESP), Ilha Solteira 15.385-000, Brazil

Energies, 2021, vol. 14, issue 17, 1-26

Abstract: This paper evaluates the influence of frequency-dependent soil conductivity and permittivity in the transient responses of single- and double-circuit transmission lines including the ground wires subjected to lightning strikes. We use Nakagawa’s approach to compute the ground-return impedance and admittance matrices where the frequency-dependent soil is modeled using Alípio and Visacro’s model. We compare some elements of these matrices with those calculated by Carson’s approach which assumes the frequency constant. Results show that a significant difference can be obtained in high resistive soils for these elements in impedance and admittance matrices. Then, we compute the transient responses for single- and double-circuit lines with ground wires located above soils of 500, 1000, 5000, and 10,000 Ω·m considering the frequency constant and frequency-dependent parameters generated for two lightning strikes (subsequent stroke and Gaussian pulse). We demonstrate that the inclusion of frequency dependence of soil results in an expressive reduction of approximately 26.15% and 42.75% in the generated voltage peaks in single- and double-circuit lines located above a high-resistive soil. These results show the impact of the frequency-dependent soils that must be considered for a precise transient analysis in power systems.

Keywords: electromagnetic transient analysis; ground-return admittance; ground-return impedance; lightning; transmission lines (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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