Examination of the effectiveness of the grounding systems of distribution substations

Poulimenos, Georgios; Damianaki, Katerina D.; Androvitsaneas, Vasilios P.; Gonos, Ioannis F.

doi:10.1109/ichve.2018.8642163

Cited by 5 publications

(2 citation statements)

References 7 publications

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“…The effects of grid sizes on the grid performance in terms of grid potential rises were well studied [9][10][11][12][13][14][15][16][17][18][19][20][21]. In this work, a constant grid size was chosen (5 m spacing).…”

Section: Methodsmentioning

confidence: 99%

Effects of lightning impulse front time on substation grounding system performance

Adnan

Malek

Din³

et al. 2020

IJEECS

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<table width="593" border="1" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" width="387"><p>The role of the grounding system in the safety of the power system and protection of personnel is obvious during an unexpected short circuit or lightning discharge at the substation. The aim of this work is to analyze the effects of several parameters: lightning impulse front time, soil resistivity and types of grid materials on the grounding system of the Substation. The ground potential rise (GPR), touch voltage and step voltage of a 50 m x 60 m grounding grid buried at a depth of 0.5 m were computed using CDEGS when injected by impulse with different front times. Results show that the shorter the front time of lightning impulse waveform, the higher the value of GPR, touch voltage and step voltage. Meanwhile, when the value of soil resistivity is increased, the value of GPR, touch voltage and step voltage is also increased. Lastly, different types of grid conductor materials give different values of GPR, touch voltage and step voltage. However, it can be said that the differences are too small to be of any significance.</p><p> </p></td></tr></tbody></table>

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Section: Methodsmentioning

confidence: 99%

Effects of lightning impulse front time on substation grounding system performance

Adnan

Malek

Din³

et al. 2020

IJEECS

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“…Soil resistivity measurements with large uncertainty rates, furthermore, involve a large dispersion of values which, in turn, leads to a large computational burden, which is a particular difficulty in data mining and classification, as well as the probable local optimum entrapment of the algorithm and unacceptable errors. The present paper, based on the feedback from previous research works concerning the step and touch voltages developed around HV distribution substations [16] and the earth structure, along with the presence of ground enhancing materials surrounding ground electrodes affecting step voltage and ground resistance values [17], aims to highlight the sources of possible errors in measuring soil resistivity and the degree that they affect the soil model parameter estimation, as well the determination of the maximum permissible limits for step and touch voltages; this suggests that insufficient safety measures are possibly undertaken against faults.…”

Section: Introductionmentioning

confidence: 99%

Effect of Soil Resistivity Measurement on the Safe Design of Grounding Systems

2020

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A prerequisite for the proper and safe designing of a grounding system is the full knowledge of the ground structure in the terrain of installation. Through soil resistivity measurements, engineers are able to illustrate the ground profile, which constitutes the most significant parameter for the design of a grounding system and for determining the maximum permissible limits of step and touch voltages. This paper highlights the high importance and necessity for engineers to choose the proper measurement axes of soil resistivity in the terrain of interest and to choose suitable measurement depths, as well the combination of axes for the final determination of the ground profile. The variance of soil resistivity values, as a function of axis distance and the impact of axis placement on determining the uncertainty of measurements, is also analyzed in detail in this study. Furthermore, this work studies the value variance of step and touch voltages as a function of measurement axes, considering two- and three-layer soil models, based on soil resistivity field measurements performed at the university campus. Therefore, the proper and premeditated measurement of soil resistivity, particularly in anisotropic ground, is proved to be of major importance for the full designing of a safe grounding system.

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Evaluation of the solid-state breakers on the performance of power distribution grids with high-RES penetration

Poulimenos

Ellinas

Voumvoulakis

et al. 2023

Electric Power Systems Research

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Examination of the effectiveness of the grounding systems of distribution substations

Cited by 5 publications

References 7 publications

Effects of lightning impulse front time on substation grounding system performance

Effects of lightning impulse front time on substation grounding system performance

Effect of Soil Resistivity Measurement on the Safe Design of Grounding Systems

Evaluation of the solid-state breakers on the performance of power distribution grids with high-RES penetration

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