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Transient analysis of power transmission towers above lossy ground with frequency dependent electrical parameters considering the water content of soil

de Azevedo, Walter Luiz Manzi, Justo de Araújo, Anderson Ricardo, Colqui, Jaimis Sajid Leon, Filho, José Pissolato and Kordi, Behzad 2023. Transient analysis of power transmission towers above lossy ground with frequency dependent electrical parameters considering the water content of soil. e-Prime - Advances in Electrical Engineering, Electronics and Energy 4 , 100161. 10.1016/j.prime.2023.100161

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Abstract

Adequate soil modeling is fundamental to assessing the grounding impedance of the grounding system and the transient responses in power systems. This paper aims to investigate three soil models with electrical parameters varying with frequency and water content, namely Smith-Longmire, Scott, and Messier models, and their impact on the ground potential rise (GPR) waveforms of vertical grounding rods. Besides that, the transient induced voltages across the string of insulators induced are also investigated for lightning currents representative first, and subsequent return strokes are employed. The harmonic grounding impedance (HGI) is calculated for rods of 3, 15, and 30 m buried in frequency-dependent (FD) soil model using commercial electromagnetic software (FEKO) with the Method of Moments (MoM) for a range of 100 Hz to 10 MHz. Simulation results show a significant modification of the calculated HGI beyond a particular frequency. The induced transient GPR waveforms show a notable reduction in their voltage peaks when the FD soil model is compared with those computed using the frequency-independent (FI) soil model. Finally, a backflashover analysis is carried out that demonstrates its dependence on the rod length, water content, and the specific soil model employed.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 2772-6711
Date of Acceptance: 25 April 2023
Last Modified: 14 Mar 2024 14:45
URI: https://orca.cardiff.ac.uk/id/eprint/166474

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