Sensitivity analysis of earthing system impedance for single and multilayered soil

Vyčítal, Václav; Topolánek, David; Toman, Petr; Ptacek, Michal

doi:10.1049/oap-cired.2017.1108

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…The substation grounding grid configuration is vital in ensuring the grounding system's safety, which is highly dependent on the soil characteristics in which the grounding system will be installed (IEEE 80, 2013;Gursu & Cevdet, 2019;Moradi, 2020;Nikolovski et al, 2016;Pavel et al, 2020;Sing et al, 2013;Vyas & Jamnani, 2012). Soil resistivity varies greatly depending on the earth's geological structure (Coelho et al, 2018;Nassereddine et al, 2010;Ma & Dawalibi, 2009;Tung & Lim, 2017;Vycital et al, 2017;Yang & Zou, 2020). Due to the variations in soil conditions at each substation, the grounding system design is made with caution to provide the maximum level of protection.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Grid Safety Values for Substation Grounding Grid Design Parameters in Vertical Two-Layer Soil Structure

Permal¹,

Osman²,

Ariffin³

et al. 2022

JST

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Typically, the impact of the structure of vertically layered soil on the grounding behavior is not considered while designing a substation grounding system. Therefore, it will result in poor grounding designs due to computed inaccurate grid safety values. Besides, no comparative analysis of the grounding design parameters’ impact on the grounding grid systems’ behavior and protection level between vertical and horizontal two-layer soil structures is presently available. Computing and analyzing the grounding behavior of apparent soil resistivity installed in a vertical two-layer soil structure is more challenging than in a horizontal two-layer soil. There are many other parameters to consider, such as the distance ‘a’ between the test electrodes and the angle ‘β’ between the perpendicular line to the soil boundary and the location of the test electrodes. One of the important findings of the assessment shows that the influence of vertically layered soil on grid impedance, step, and touch voltages of a grounding system is insignificant compared to a homogeneous and horizontally layered soil structure. The current flow is affected by an entire grounding grid placed in a specified layer of soil with a specific resistivity for horizontally layered soil. In contrast, soil boundaries separate a grounding grid with various resistivities for vertically layered soil. The outcome of this work is crucial in helping the engineers to understand the behavior of grounding systems in diverse soil conditions and tropical climates.

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Section: Introductionmentioning

confidence: 99%

Assessment of the Grid Safety Values for Substation Grounding Grid Design Parameters in Vertical Two-Layer Soil Structure

Permal¹,

Osman²,

Ariffin³

et al. 2022

JST

View full text Add to dashboard Cite

show abstract

The Impact of Substation Grounding Grid Design Parameters in Non-Homogenous Soil to the Grid Safety Threshold Parameters

et al. 2021

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It is important to ensure that a grounding system is designed with a low magnitude of earth resistance, so the protection system can divert the large fault current to earth effectively. The performances and protection level of a grounding system need to be acknowledged as the condition of soil structure changes with different soil characteristics. At present, there is a lack of systematic guide or standards for grounding grid designs that consider non-uniform soil and its impact on the grounding systems. By computing the grid safety threshold parameters consisting of the grid impedance, step, and touch voltages, a comparison has been made between uniform soil and two-layer soil models. Where the competence and level of safety of the grounding systems depend on the soil attributes, the significant impact of various soil conditions is seen. The evaluations on performance and safety assessment in two-layer soil conditions hold the novelty and originality as there is no such comparison and discussion have been made to date. These comparisons would help in forecasting the behavior and safety of the grounding system in various soil environments, which would provide engineers with additional expertise to design an effective and secure grounding system. This research would contribute to the existing body of knowledge by differentiating and predicting the performance of a grounding system when the characteristics of the soil differ significantly from uniform soil as most of the standards and guidelines only consider uniform soil while designing a grounding system, owing to its complexity at the site. INDEX TERMS grounding grid impedance, step voltage, touch voltage, multilayer soil, uniform soil, non-homogeneous soil.

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Segmented Sampling Least Squares Algorithm for Green's Function of Arbitrary Layered Soil

Dan

Zhang

Duanmu

et al. 2021

IEEE Trans. Power Delivery

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Sensitivity analysis of earthing system impedance for single and multilayered soil

Cited by 4 publications

References 15 publications

Assessment of the Grid Safety Values for Substation Grounding Grid Design Parameters in Vertical Two-Layer Soil Structure

Assessment of the Grid Safety Values for Substation Grounding Grid Design Parameters in Vertical Two-Layer Soil Structure

The Impact of Substation Grounding Grid Design Parameters in Non-Homogenous Soil to the Grid Safety Threshold Parameters

Segmented Sampling Least Squares Algorithm for Green's Function of Arbitrary Layered Soil

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