Computation of Surge Voltage in Transmission Tower Located above Frequency-Dependent Soil
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Data
2021-01-01
Autores
Justo De Araujo, Anderson Ricardo
Manzi De Azevedo, Walter Luiz
Filho, Jose Pissolato
Leon Colqui, Jaimis Saiid
Kurokawa, Sergio
Kordi, Behzad
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Resumo
The purpose of this paper is to investigate the influence of frequency-dependent soils with variable soil content on the transient voltages at transmission towers. First, a comparative analysis between the impedance of tower-footing grounding rods buried in frequency-independent and frequency-dependent soils is carried. Then, the performance of ground potential rise (GPR) subjected to two types of lightning currents (first and subsequent return strokes) is studied. In a second part, these grounding rods are connected into a single-circuit transmission tower where the admittance of the structure located on frequency-independent and frequency-dependent soil is computed. The surge voltages generated by the two lightning currents are studied for these two types of soil. The frequency-domain responses are computed using the numerical method of Moments based on Electric Field Integral Equations in a frequency range from 100 Hz up to 10 MHz. Numerical results demonstrate that the frequency dependency of soil electrical parameters results in a modification of the rod impedance, especially at high frequencies. As a consequence, when the frequency-dependent soil is considered, a reduction at the transient voltage peaks is obtained compared with those calculated for a frequency-independent soil. This reduction is more pronounced when the transmission tower is located on the soil of high resistivity and subjected to a subsequent return stroke due to its higher energy at the high frequencies.
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Electromagnetic transients, Ground potential rise, Grounding grid, Water content
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2021 35th International Conference on Lightning Protection, ICLP 2021 and 16th International Symposium on Lightning Protection, SIPDA 2021.