Transient equivalent circuit of a horizontal grounding electrode

Yutthagowith, Peerawut; Kunakorn, A.; Potivejkul, S.; Chaisiri, Punyavee

doi:10.1109/ichve.2012.6357071

Cited by 6 publications

(3 citation statements)

References 9 publications

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“…In the engineering design of lightning protection, the worst-case scenario needs to be considered for assessing the lightning stroke effects. As far as the grounding for lightning protection is concerned, the direct stroke to substations is considered and the electrical equipment connected with the grounding grids is neglected to carry out the worst-case transient analysis of the grounding grids [2,[17][18][19][20]. For this reason, a lightning current i of the direct stroke is injected into a node in the grounding grid (view Fig.…”

Section: Circuit Modeling Of Grounding Gridsmentioning

confidence: 99%

“…Knowledge of the transient performance of the grounding grids is necessary for establishing the efficacy of lightning protection of personnel and equipment. There has been increasing attention to the transient analysis of the ground grids [1][2][3][4]. However, the main drawback in the previous work is that only a deterministic analysis was made for the lightning transient in the grounding grids.…”

Section: Introductionmentioning

confidence: 99%

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A Practical Method for Transient Analysis of Grounding Grids

Zhang

2023

IEEJ Transactions Elec Engng

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A practical method is proposed in this paper for analysis of the lightning transient in the grounding grids. The circuit parameters of the grounding electrodes are evaluated by a set of analytic formulas, in which the soil ionization effect is taken into account. By means of the circuit parameters, the grounding electrode segments are represented by the π‐type circuits and a circuit model is built for the grounding grids. The lightning transient responses in the grounding grids can be calculated from the circuit model. The calculated results are compared with the measured ones to check the validity of the circuit model. In view of the actual distribution randomness, the lightning current amplitude is taken as a random variable and a statistical algorithm is further presented for statistical analysis of the lightning transient in the grounding grids. In the algorithm, the accumulative probability function is introduced to describe the random distribution of the lightning current amplitude. The lightning transient responses calculated in a large interval of the lightning current amplitude are weighted by the corresponding probability density. Then, the statistical values of the lightning transient responses can be obtained from the weighted sum. A numerical example is also given to discuss the difference between the statistical values and the nonstatistical ones calculated by the conventional method. © 2023 Institute of Electrical Engineer of Japan and Wiley Periodicals LLC.

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Section: Circuit Modeling Of Grounding Gridsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A Practical Method for Transient Analysis of Grounding Grids

Zhang

2023

IEEJ Transactions Elec Engng

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“…Several models have been proposed to represent horizontal electrodes based on the distributed or lumped circuit approaches and to compute the grounding impedance of these conductors (Sunde, 1949;Grcev e Popov, 2005;Yutthagowith et al, 2012;Yang et al, 2013). Considering that the lumped approach can be applied for a thin uniform cylinder of radius a h , length of l h and burial depth of d, as shown in Fig.…”

Section: Lumped Approach For Horizontal Electrodesmentioning

confidence: 99%

Transient Voltages on Grounding Grids buried in Stratified Soils

Araújo

Azevedo

Filho

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

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Grounding grids (GG) play a fundamental role in the protection of personnel and prevention of damages in equipment during surge transients on substations caused by lightning discharges on power systems. In this context, a precise GG modeling must consider several factors such as the arrangement and the soil compacted in stratified layers. This paper proposes a lumped approach for GG buried in several stratified soils to compute the transient node voltages when subjected to lightning strikes. The vertical and horizontal electrodes are modelled separately by lumped circuit approach. The vertical electrode impedances buried in a stratified soil are computed by the numerical Method of Moments (MoM) in the full-wave electromagnetic software FEKOR , directly in frequency domain, and then, an electric circuit is obtained by the Vector Fitting technique. The horizontal electrodes are modelled based on the electromagnetic radiation theory, where each segment of the electrode can be regarded as a lamental currentcarrying conductor. Lightning currents of fast and slow-front waveforms, are employed in the simulations. Results show that when stratified soils are considered, the differences of the transient voltage peaks, in comparison with the ones calculated for the homogeneous soil is more pronounced as the thickness of soil decreases.

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