Multilayer Earth Structure Approximation by a Homogeneous Conductivity Soil for Ground Return Impedance Calculations

Martins-Britto, Amauri G.; Lopes, Felipe V.; Rondineau, S.

doi:10.1109/tpwrd.2019.2930406

Cited by 21 publications

(4 citation statements)

References 21 publications

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“…During the measurement process, the measured apparent soil resistivity can be obtained by Equation (2). During the calculation of apparent soil resistivity, φðD; h 0 Þ and φð2D; h 0 Þ are the potential functions.…”

Section: The Measurement and Calculation Of Apparent Soil Resistivitymentioning

confidence: 99%

“…Horizontally layered soil parameters are usually calculated based on a series of discrete measured data of apparent soil resistivity (referred to as calculated soil parameters). The accuracy of calculated soil parameters has a great influence on the grounding parameter calculations [1–3]. Therefore, it is significant to study the influence of calculated soil parameters on grounding parameters [4].…”

Section: Introductionmentioning

confidence: 99%

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Influence analysis of calculated horizontally layered soil parameters on grounding parameters

et al. 2022

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Calculated parameters (soil layer resistivity, soil layer thickness, and the number of soil layers) of horizontally layered soil are usually obtained based on the measured apparent resistivity under different measurement distances, which are significant for the design, operation, and maintenance of grounding grids. Most existing calculation methods of soil parameters are just trying to make the calculation results approach the measurement data, ignoring the relationship among measurement data, the calculated soil parameters, and grounding parameters, which would increase the workload of the measurement. To better balance the distance range of the measurement data and the influence of the calculated horizontally layered soil on grounding parameters, this paper systematically studies the relationship among measured apparent soil resistivity, calculated horizontally layered soil parameters, and grounding parameters. The basic theories of apparent resistivity measurement, soil parameter calculation, and grounding parameter calculation are given, the influence of soil layer thickness on the measured apparent resistivity is studied, and the influence of the calculated soil parameters on the grounding resistance of different grounding models is analysed. Based on different scales of grounding grids, the results give a corresponding reference distance range of measured apparent soil resistivity. Therefore, this paper can help decrease the workload of soil resistivity measurement during grounding parameters analysis, which has far-reaching engineering significance. | INTRODUCTIONHorizontally layered soil parameters are usually calculated based on a series of discrete measured data of apparent soil resistivity (referred to as calculated soil parameters). The accuracy of calculated soil parameters has a great influence on the grounding parameter calculations [1-3]. Therefore, it is significant to study the influence of calculated soil parameters on grounding parameters [4].Numerous scholars have studied the calculation of the parameters of horizontally layered soil. T. Takahashi gave the expressions for parameters estimation of arbitrary horizontally n-layer soil [5]. F. P. Dawalibi analysed the grounding parameters in different horizontally layered soils [6]. However, Ref. [5] and Ref. [6] did not focus on the influence of the measured apparent soil resistivity on the estimation results. J. L. del Alamo used 8 different mathematical methods to calculate the parameters of horizontally layered soil, and gave the advantages and disadvantages of those methods [7]. P. J. Lagace studied the combination method of the static image during the calculation, improved calculation efficiency, and effectively solved the interpolation problem in different methods [8]. In recent years, heuristic optimization algorithms are widely used in the calculation of soil parameters. I. F. Gonos and W. P. Calixto improved the genetic algorithm (GA) to calculate soil parameters, and the results of the This is an open access article under the terms of...

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Section: The Measurement and Calculation Of Apparent Soil Resistivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence analysis of calculated horizontally layered soil parameters on grounding parameters

et al. 2022

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“…Martins-Britto et al [31] based on the work of Tsiamitros et al [32] proposed a technique to approximate a multilayer soil by a homogeneous soil to calculate the ground-return impedance using the Nakagawa's approach in a frequency range of 1 Hz to 2 MHz. Then, the transient voltages are calculated and studied in the ATP software for 150-kV single circuit three-phase OHTL with neutral wires.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The γ 2 g and γ 2 0 are the squared propagation constants of the air and soil (γ 2 g = jωµ g (jωε r ε 0 + σ g ) and γ 2 0 = −ω 2 µ 0 ε 0 ), respectively. The integration variable λ represents the spatial frequency of the Fourier spectrum which is related to the energy attenuation throughout the soil layer (or layers in a stratified soil) [31].…”

Section: Modeling Of Ohtlsmentioning

confidence: 99%

A Comparison of Frequency-Dependent Soil Models: Electromagnetic Transient Analysis of Overhead Transmission Lines Using Modal Decomposition

et al. 2022

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This article investigates the influence of four causal frequency-dependent (FD) soil models and their impact on the responses of a multiphase overhead transmission line (OHTL) with ground wires, generated by a lightning strike. The FD models proposed by Longmire-Smith (LS), Messier (M), Portela (P) and Alípio-Visacro (AV) are considered. The ground-return impedance and admittance matrices are computed with the Nagakawa approach for both frequency-constant and FD soil models. The frequency-domain modal voltages and time-domain transient voltages are assessed in this work. Modal decomposition technique is used to study the attenuation constant, propagation velocity and voltages for each propagation mode. Simulations are carried out in a frequency range of 100 Hz to 10 MHz, for OHTLs with lengths of 1 and 10 km, on soils of 700 and 4000 Ω·m. Simulation results demonstrated that the Portela (P) model has resulted in more significant variation in the ground-return impedance and admittance, constant attenuation and propagation velocity in which a pronounced variation, especially at the high frequencies, is seen. On the other hand, Longmire-Smith (LS) and Messier (M) have produced similar results in both frequency and time domains. Additionally, the Alípio-Visacro (AV) model has produced intermediate responses, being the model recommended by CIGRÈ WG C4.33. Time-domain induced voltage waveforms obtained with the Portela (P) model has shown pronounced differences, especially at the peak values, for the high-resistive soil. This study demonstrates the importance of considering the FD soil models to assess the transient responses adequately, especially when OHTLs are on high-resistive soils.

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Construction of a two-layer soil model from earth conductivity maps

Lucca

2021

Electr Eng

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Multilayer Earth Structure Approximation by a Homogeneous Conductivity Soil for Ground Return Impedance Calculations

Cited by 21 publications

References 21 publications

Influence analysis of calculated horizontally layered soil parameters on grounding parameters

Influence analysis of calculated horizontally layered soil parameters on grounding parameters

A Comparison of Frequency-Dependent Soil Models: Electromagnetic Transient Analysis of Overhead Transmission Lines Using Modal Decomposition

Construction of a two-layer soil model from earth conductivity maps

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