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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Garbelim Pascoalato, Taina Fernanda [1] ; Justo de Araujo, Anderson Ricardo [2] ; Caballero, Pablo Torrez [1] ; Leon Colqui, Jaimis Sajid [1] ; Kurokawa, Sergio [1]
Total Authors: 5
[1] Sao Paulo State Univ UNESP, Dept Elect Engn, BR-15385000 Ilha Solteira - Brazil
[2] State Univ Campinas UNICAMP, Sch Elect & Comp Engn, BR-13083872 Campinas - Brazil
Total Affiliations: 2
Document type: Journal article
Source: ENERGIES; v. 14, n. 17 SEP 2021.
Web of Science Citations: 0

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 Alipio 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 omega center dot 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. (AU)

FAPESP's process: 19/01396-1 - Modelling conventional and tall transmission towers directly in time domain for electromagnetic transient analysis
Grantee:Anderson Ricardo Justo de Araújo
Support Opportunities: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 20/10141-4 - Influence of the soil electromagnetic characteristics in the transient responses in electric transmission lines
Grantee:Tainá Fernanda Garbelim Pascoalato
Support Opportunities: Scholarships in Brazil - Doctorate