A new soil ionization model for grounding electrodes

Mokhtari, Mehrdad; Abdul‐Malek, Zulkurnain; Gharehpetian, Gevork B.

doi:10.1002/etep.2266

Cited by 5 publications

(3 citation statements)

References 31 publications

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“…Other parameters may also influence the grid performance. It is well known that soil behaves differently when subjected to large transient currents such as having ionization phenomenon within the soil grains [22][23][24][25][26]. The effects of soil ionization were not however modelled when the design is based on AC 50 Hz frequency or even short circuit current.…”

Section: The Effects Of Grid Conductor Materialsmentioning

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: The Effects Of Grid Conductor Materialsmentioning

confidence: 99%

Effects of lightning impulse front time on substation grounding system performance

Adnan

Malek

Din³

et al. 2020

IJEECS

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“…Basically, the amplitude value in lightning current waveform has most significant effect on the transient performance rather than front time and tail time [4,5]. Besides, the higher amplitude of the lightning current gives the higher field gradient produced in soil around the grounding grid, which will make soil ionization more severe [13][14][15][16].…”

Section: Effect Of Lightning Current Amplitude With Different Soil Profilesmentioning

confidence: 99%

Effects of Soil Profile on the Transient Performance of Substation Grounding System

Malek

Yaman

Adnan

2020

IJEECS

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<table width="593" border="1" cellspacing="0" cellpadding="0"><tbody><tr><td valign="top" width="387"><p>Lightning transient characteristic of the grounding grid is fundamental for optimum performance of lightning protection of a substation. In order to design an appropriate grounding system for such substation, it is important to study its transient characteristics because the high impulse current is significantly different compared to power frequency current. In this paper, substation grounding grid model was developed using CDEGS software to analyze the grid transient performance in terms of ground potential rise (GPR), touch voltage and step voltage when the grounding system is struck by a lightning impulse current. Several parameters, such as lightning current amplitude, feed point and the number of sub-grids, were altered to study their relationship with the transient performance. The maximum transient GPR, touch voltage, and step voltage increase as the lightning current amplitude increase. The maximum transient GPR and step voltage are the highest at the corner of the grounding grid while the maximum touch voltage is the highest at the centre of the grounding grid. In addition, the maximum transient GPR and step voltage decrease when the number of sub-grid increases. In contrast, the touch voltage slightly increases as the number of sub-grid increases. The maximum transient GPR, and step voltage are the highest at the 2-layer and the lowest at the uniform soil or single-layer soil.</p></td></tr></tbody></table>

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“…At present, the research on the impulse characteristics of the grounding grid mainly focuses on two aspects: numerical simulation calculation and experimental research [1][2][3][8][9][10][11]. Numerical simulation calculations mainly use electromagnetic field theory, transmission line theory, etc., to simplify the physical process and calculate the impulse characteristics of the grounding grid.…”

Section: Introductionmentioning

confidence: 99%

Measurement and analysis of impulse grounding impedance of tower grounding device subjected to artificial lightning M‐component

Zhang¹,

Cai²,

Qi³

et al. 2022

IET Generation Trans & Dist

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The impulse grounding impedance of tower grounding device is one of the important factors in the lightning protection evaluation of transmission line. The impulse characteristic test of the actual tower grounding device under lightning was rarely carried out due to the limitation of the test conditions. With the help of Guangzhou Field Experiment Site for Lightning Research and Testing, the artificial lightning characteristic test of the true tower grounding device was carried out. This paper presented partial observation experimental results and related analysis of the impulse grounding impedance of tower grounding device subjected to artificial lightning M‐component. A calculation model of the tower grounding device subjected to lightning M‐component was established. The changes of the surface soil resistivity under the action of rainwater were taken into account in the calculation. The test data and calculation results of the tower grounding device under the impact of the artificial lightning M‐component had achieved good agreement. The non‐linear ionization of the soil around the tower grounding device can be ignored, and the real impulse grounding impedance was very close to the DC grounding resistance or power frequency grounding impedance, when the tower grounding device in the experiment was subjected to lightning current M‐component.

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A new soil ionization model for grounding electrodes

Cited by 5 publications

References 31 publications

Effects of lightning impulse front time on substation grounding system performance

Effects of lightning impulse front time on substation grounding system performance

Effects of Soil Profile on the Transient Performance of Substation Grounding System

Measurement and analysis of impulse grounding impedance of tower grounding device subjected to artificial lightning M‐component

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