Analysis of Grounding Systems in Soils with Finite Volumes of Different Resistivities

Ma, Jianjun; Dawalibi, F.P.

doi:10.1109/mper.2002.4312094

Cited by 52 publications

(30 citation statements)

References 13 publications

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“…This volume is a horizontal infinite layer whose upper boundary is the flat surface of the new soil model, and its lower boundary is the uneven surface of the real soil, as shown in Figure 1. The contribution to the potential is done by the equivalent surface charge distributions (ESCD) approach [10][11][12], which assumes the existence of a charge density on the volume interfaces, whose value is determined during the calculation. The potential associated with ESCD should be included as a contribution to the total potential on the electrodes, which also must satisfy the boundary conditions included in the last two equations Energies 2017, 10, 176 5 of 10 in Equation (2).…”

Section: Theoretical Backgroundmentioning

confidence: 99%

An Estimate of the Uncertainty in the Grounding Resistance of Electrodes Buried in Two-Layered Soils with Non-Flat Surface

2017

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Abstract:The influence of the irregular surface of a multi-layered soil on the estimation of the ground resistance of a complex electrode is studied. The electrode is placed in the first layer while the irregular surface is treated as the interface of an inhomogeneous volume filled with air and embedded in the first layer. A wide sample of irregular soils is generated and the variation of the electrode grounding resistance, as a function of a parameter that measures the surface unevenness, is evaluated. A stochastic model of the grounding resistance is proposed for which the variation of the electrode grounding resistance with its horizontal position relative to the surface is studied. The model features allow us to explain the variability found, as we are able to estimate the part of the uncertainty about the electrode grounding resistance measurements due to the non-planar soil surface.

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Section: Theoretical Backgroundmentioning

confidence: 99%

An Estimate of the Uncertainty in the Grounding Resistance of Electrodes Buried in Two-Layered Soils with Non-Flat Surface

2017

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“…Ma and Dawalibi [14] presented a theoretical model of a grounding system in soils with finite volumes of different resistivity with both analytical and numerical validations. Celli and Pilo [15] developed a distributed parameter model of grounding system using PSCAD/EMTDC to calculate voltage distribution and currents in buried horizontal electrodes during a lightning discharge.…”

Section: Introductionmentioning

confidence: 99%

Grounding System Analysis with Satellite Electrode for High-resistivity Limited-area Substations and Impact of Vertical Fault

Kumar

Seedhar

2011

Electric Power Components and Systems

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This article proposes a new method of grounding system analysis in the presence of a satellite electrode determining grounding resistance, step and touch voltages, and earth surface potential distribution considering the impact of depth of tie-wires. The impact of lateral variation of vertical fault has also been studied for safe and touch potentials along the length of tie-wire. A computer program called "grounding system analysis in the presence of vertical fault" has been developed. The validation of the program has been carried out for the problem available in the literature. An experimental analysis has been carried out for a grounding system with ring and rod electrodes placed in soils of different resistivity separated by a vertical fault. A parametric study has been carried out on two square grids laid in the earth on both sides of the vertical fault connected together by an underground tie-wire and with the tie-wire only for comparison. The impact of the depth of the tie-wire and lateral variation of the vertical fault has been studied for determining ground resistance, step and touch voltages, and earth surface potentials near the square grids, as well as along the length of the tie-wire.

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“…To the best of the authors' knowledge, no method for the analysis of grounding systems in such a soil model is available yet. The closest approach to solving this problem is the one described in [1] in which grounding systems in a soil model consisting of multiple soil volumes can be analyzed. The approach described in [1] together with the approach for the analysis of grounding systems in multilayered soils presented in [2] will be used for the study in this paper.…”

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confidence: 99%

“…The closest approach to solving this problem is the one described in [1] in which grounding systems in a soil model consisting of multiple soil volumes can be analyzed. The approach described in [1] together with the approach for the analysis of grounding systems in multilayered soils presented in [2] will be used for the study in this paper. The grounding software used to produce the computation results is described in [3].…”

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confidence: 99%

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Effect of Backfill on the Performance of Substation Grounding Systems

Dawalibi

2012

2012 Asia-Pacific Power and Energy Engineering Conference

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The effect of backfill on the performance of the grounding system of a substation is studied in this paper. The backfill is simply the replacement of the existing soil surrounding the grounding grid with a different soil. When the backfill soil resistivity is higher than the original soil resistivity, the touch voltage is higher compared with the case where no backfill is used; the step voltage can also be slightly higher. When the backfill soil resistivity is lower than the original soil resistivity, the touch voltage is lower compared with the case where no backfill is used but the step voltage is significantly higher. An approximate method for modeling the backfill in a multilayer soil is also presented.

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Analysis of Grounding Systems in Soils with Finite Volumes of Different Resistivities

Cited by 52 publications

References 13 publications

An Estimate of the Uncertainty in the Grounding Resistance of Electrodes Buried in Two-Layered Soils with Non-Flat Surface

An Estimate of the Uncertainty in the Grounding Resistance of Electrodes Buried in Two-Layered Soils with Non-Flat Surface

Grounding System Analysis with Satellite Electrode for High-resistivity Limited-area Substations and Impact of Vertical Fault

Effect of Backfill on the Performance of Substation Grounding Systems

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