Ground resistance of concrete foundations in substation yards

Thapar, B.; Ferrer, Olivares; Blank, David A.

doi:10.1109/61.107265

Cited by 19 publications

(4 citation statements)

References 2 publications

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“…1 and considered in [10]. The resistance of the concrete mat R cm may be estimated by different methods, but the one proposed in [11] is followed.…”

Section: B Inclusion Of the Stray Current Concrete Matmentioning

confidence: 99%

Evaluating stray current from DC electrified transit systems with lumped parameter and multi-layer soil models

2013

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DC electrified traction systems are a potential source of stray current, that may corrode both internal and external structures and installations. The stray current intensity depends on several factors (traction current, rail insulation, concrete mat and piers resistance), that are accounted for in the proposed model. Moreover, the effect of a uniform or multi-layer soil model is considered, showing the differences and the impact on the countermeasures with respect to a uniform soil model simplifying approach

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“…1 and considered in [10]. The resistance of the concrete mat R cm may be estimated by different methods, but the one proposed in [11] is followed.…”

Section: B Inclusion Of the Stray Current Concrete Matmentioning

confidence: 99%

Evaluating stray current from DC electrified transit systems with lumped parameter and multi-layer soil models

2013

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“…For example, flat conductor is equivalent to cylindrical conductor by the method of equal cross-sectional area [18], in which the equivalent radius r 1 is given by r 1 = L/ √ π , where L is the cross-sectional side length of the grounding electrode. The equal cross-sectional perimeter method that fully considers the contact resistance between the foundation and the soil was also introduced, with which the equivalent radius is given by r 2 = 2L/π [19]. Based on the same idea, Pan et al proposed a method to equate cylindrical reinforced concrete foundation into a cylindrical conductor so that the grounding resistance can be obtained by the method of moments, which simplified the calculation [20].…”

Section: Introductionmentioning

confidence: 99%

A Method for Calculating Grounding Resistance of Reinforced Concrete Foundation Grounding Systems

Dou

et al. 2022

Energies

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Tower foundations have been used as grounding electrodes to reduce the area of the grounding devices. However, it is difficult to calculate the grounding resistance due to the complex structure of the reinforced concrete foundation. A method for calculating grounding resistance of reinforced concrete foundations is proposed in this paper. The method equates the complex foundation structure into a cylindrical conductor and then calculates the grounding resistance with the help of the method of moments, which simplifies establishment of the simulation model and reduces the extensive computation. In addition, the applicability of the equal cross-sectional area method and the equal cross-sectional perimeter method is analyzed. It shows that both methods are applicable only when the concrete resistivity is close to the soil resistivity. The equal cross-sectional area method is applicable when the concrete resistivity is within twice the soil resistivity, while the equal cross-sectional perimeter method is applicable when the concrete resistivity is approximately same or less than the resistivity of the soil.

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“…Ref. [12] has evaluated the role played by the foundations in a substation yard as grounding element and estimated the magnitude of the fault and leakage currents carried by the foundations. An artificial intelligent network approach is used for developing the relationship between the ground resistance and the vertically inserted electrode in the soil in [13].…”

Section: Introductionmentioning

confidence: 99%

Soil resistivity and ground resistance for dry and wet soil

Salam

Rahman

Ang

et al. 2015

J. Mod. Power Syst. Clean Energy

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In this paper, soil resistivity and ground resistance at two different sites near an electrical substation are measured using a grounding system grid with and without rods. With the Wenner four-pole equal-method, the soil resistivity is measured at both selected sites, one of which contains wet soil while the other contains dry soil. Cymgrd simulation software is then used to determine the acceptability of these measured resistivity values by finding out the root mean square error between the measured and calculated values for both wet and dry soil sites. These values for wet and dry soil sties were found to be only 0 % and 4.92 %, respectively, and deemed acceptable. The measured soil resistivity values were then used to evaluate the ground resistance values of a grounding grid 'with rod' for the wet soil site and 'without rods' for the dry soil site, and then compared with the simulated ground resistance values. These comparisons were also found to be in good agreement. In addition, ground potential rise, maximum permissible step and touch potentials have also been estimated using the simulation software.

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Ground resistance of concrete foundations in substation yards

Cited by 19 publications

References 2 publications

Evaluating stray current from DC electrified transit systems with lumped parameter and multi-layer soil models

Evaluating stray current from DC electrified transit systems with lumped parameter and multi-layer soil models

A Method for Calculating Grounding Resistance of Reinforced Concrete Foundation Grounding Systems

Soil resistivity and ground resistance for dry and wet soil

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