Ground potential rise of faulty substations having equal and unequal spacing grounding grids conductors

Gouda, Osama E.; Dein, Adel Z. El

doi:10.1049/iet-gtd.2016.0263

Cited by 22 publications

(22 citation statements)

References 15 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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“…When the grounding simulation test is conducted, in order to minimize the effect of the tank wall on the current field distribution of the grounding grid model as much as possible, the radius of the metallic tank should be greater than twice the diagonal of the grounding grid model. Based on [22][23][24][25], the grounding simulation test system was introduced, and parameters were selected. Agar gel and tap water were used to simulate the soil medium in the test.…”

Section: The Test Platform and Test Methodsmentioning

confidence: 99%

The Effect of a Large Backfill Area on Grounding Grid Performance

Tao¹,

Wei²,

Li³

et al. 2018

Energies

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The construction of a substation will undoubtedly change the properties of any surrounding native soil. In order to study the influence of backfill material on grounding grid performance and in turn optimize that performance, current distribution, electromagnetic fields, ground, and soil structure analysis (CDEGS) was undertaken to simulate the secondary peak of the step voltage generated by a large backfill soil area. As for the various parameters of the finite soil volume, the influence of the soil length L, the edge gradient tan θ, and the resistivity ρ on the secondary peak of step voltage was researched. Then, a grounding test system was established, the selection process of the protection resistors was clarified, and the usage method of agar gel was improved. The feasibility of simulating backfill material with agar gel was verified, and the influence of resistivity and soil scale on the secondary peak of the step voltage was tested. The results show that the larger the backfill material length is, the larger the resistivity is, and the lower the peak voltage is. The effect of soil resistivity on the secondary peak will be greater when the range of backfill material is larger, which means that reducing soil resistivity can effectively reduce the secondary peak. Therefore, a smaller slope can be formed at the edge of the earthwork in the actual substation to reduce the project amount and save investment, which has a certain degree of engineering significance.

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“…Conductors’ arrangement in the grid is giving an impact on the safety parameters. Grid with densely populated conductors at grid edges and sparse in the centre region has more safe and efficient design than ESG [10]. Many researchers proposed their work to conceive a safe and economic grounding grid by using different evolutionary techniques such as CSM in [11], GA in [12], particle swarm optimisation (PSO) techniques in [13], and hybridisation between GA and PSO in [1].…”

Section: Introductionmentioning

confidence: 99%

Designing of cost minimum substation grounding grid system using DE, SCA, and HDESCA techniques

Sengar

Chandrasekaran

2019

IET Science, Measurement & Technology

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Ground potential rise of faulty substations having equal and unequal spacing grounding grids conductors

Cited by 22 publications

References 15 publications

Effects of lightning impulse front time on substation grounding system performance

Effects of lightning impulse front time on substation grounding system performance

The Effect of a Large Backfill Area on Grounding Grid Performance

Designing of cost minimum substation grounding grid system using DE, SCA, and HDESCA techniques

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