Electromagnetic transient modeling of grounding electrodes buried in frequency dependent soil with variable water content

Salarieh, Bamdad; Silva, H.M. Jeewantha De; Kordi, Behzad

doi:10.1016/j.epsr.2020.106595

Cited by 29 publications

(16 citation statements)

References 26 publications

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“…Impulse grounding simulation test can further simulate grounding resistance of grounding grid under lightning impulse current or short-circuit fault current, which is closer to the actual situation. The disadvantage is that it is difficult to achieve the scaled model of impulse test platform, especially the rising edge time variable of impulse current [9,10].…”

Section: Complete Similar Model Based On Dimensional Analysis Methodsmentioning

confidence: 99%

RETRACTED ARTICLE: Structure optimization and preparation of power system grounding grid based on similarity data analysis algorithm

Huang

Jeon

et al. 2022

Int J Adv Manuf Technol

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The grounding grid of power equipment is the most basic overvoltage protection device for the power system. Before the design and construction of the power grounding grid, the power system generally uses a scaled-down model to verify the characteristics of the grounding grid. As the types and structures of grounding materials become more and more complex, there are one or more similar items in the grounding simulation test that cannot be scaled down. This paper takes the similarity test of a new type of grounding material-flexible graphite composite grounding material as an example. Firstly, the complete similarity theory of grounding simulation test is deduced. Secondly, the source of similar distortion items is analyzed. Then, the distortion error of different similar items is analyzed. Finally, the distortion similarity test of the flexible graphite composite grounding material is taken as an example to verify the test error influence of the distortion similarity item of the grounding simulation. The research results of this paper can provide reference for grounding simulation test, and at the same time, it can be applied to similar tests in other fields.

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Section: Complete Similar Model Based On Dimensional Analysis Methodsmentioning

confidence: 99%

RETRACTED ARTICLE: Structure optimization and preparation of power system grounding grid based on similarity data analysis algorithm

Huang

Jeon

et al. 2022

Int J Adv Manuf Technol

View full text Add to dashboard Cite

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“…The magnetic permeability is practically frequency independent and assumed to be equal to vacuum µ g = µ 0 . However, the last two, ρ g and ε rg , are greatly affected by the frequency specially for high-resistive soils [37][38][39].…”

Section: Frequency-dependent Soil Electrical Parametersmentioning

confidence: 99%

“…Later, in the 1970s, several authors developed theoretical and experimental models based on field experiments as summarized in [5,16]. Recently, in the electromagnetic software tools that solve the frequency-domain Maxwell's equations include the frequency dependence of soil electrical parameters to carry out the lightning performance on grounding systems and on transmission lines such as in [22,[37][38][39]43].…”

Section: Frequency-dependent Soil Electrical Parametersmentioning

confidence: 99%

Transient Analysis of Multiphase Transmission Lines Located above Frequency-Dependent Soils

et al. 2021

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This paper evaluates the influence of frequency-dependent soil conductivity and permittivity in the transient responses of single- and double-circuit transmission lines including the ground wires subjected to lightning strikes. We use Nakagawa’s approach to compute the ground-return impedance and admittance matrices where the frequency-dependent soil is modeled using Alípio and Visacro’s model. We compare some elements of these matrices with those calculated by Carson’s approach which assumes the frequency constant. Results show that a significant difference can be obtained in high resistive soils for these elements in impedance and admittance matrices. Then, we compute the transient responses for single- and double-circuit lines with ground wires located above soils of 500, 1000, 5000, and 10,000 Ω·m considering the frequency constant and frequency-dependent parameters generated for two lightning strikes (subsequent stroke and Gaussian pulse). We demonstrate that the inclusion of frequency dependence of soil results in an expressive reduction of approximately 26.15% and 42.75% in the generated voltage peaks in single- and double-circuit lines located above a high-resistive soil. These results show the impact of the frequency-dependent soils that must be considered for a precise transient analysis in power systems.

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“…Numerous approaches have been used to determine these equivalent models. Perhaps all the approaches known in electromagnetics have been used to estimate the impact of voltage and current waves propagation along towers: the time-domain finite-difference method [31,32], the frequency-domain method of moments [33], the partial element equivalent circuit method [34], hybrid electromagnetic codes [35,36], black-box approaches [37], and the frequency-domain finite element method [38]. Additionally, there is a huge number of simple and practical models based on analytical approaches-usually based on magnetostatics [39] or transverse electromagnetic (TEM) transmission line assumptions [31]-that are not as computational heavy as full-wave approaches.…”

Section: Introductionmentioning

confidence: 99%

“…He assessed the propagation of voltage and current waves by means of the TL characteristic impedance (depending on the geometrical features of the tower), and assumed the propagation velocity to be equal to the speed of light. Despite some works claiming the accuracy of the results obtained with Jordan's expression of the characteristic impedance [35], an error was detected in its derivation, and a revised formula was proposed ( [39,41]). Successively, others have proposed equivalent lossless TL models, deriving different expressions for the characteristic impedance.…”

Section: Introductionmentioning

confidence: 99%

Tower Models for Power Systems Transients: A Review

et al. 2022

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Fast-front transients play an important role in the insulation design of any power system. When a stroke hits the shield wire or the tower of high-voltage overhead power lines, flashover may occur either along the span or across tower insulators, depending on the relevant voltages and insulation strength. As a result, backflashover may take place from the tower structure to the phase conductor whenever a huge impulse current flows along the tower towards considerably high footing impedances. For these reasons, tower modeling for transients studies is an important step in the insulation design, and also for lower voltage applications, where indirect lightning effects may play a predominant role. However, after decades of research on tower modeling, starting from the 1930s with the first model proposed by Jordan, no consensus has been reached neither on a widely accepted tower model nor on the quantitative effect of the tower models on insulation design. Moreover, the fundamental mechanisms at the base of the transient response of towers and the definition of some fundamental parameters have not been totally clarified yet. The aim of this review is to present the available tower models developed through the years in the power community, focussing mainly on lumped/distributed circuit models, and to help the reader to obtain a deeper understanding of them.

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Electromagnetic transient modeling of grounding electrodes buried in frequency dependent soil with variable water content

Cited by 29 publications

References 26 publications

RETRACTED ARTICLE: Structure optimization and preparation of power system grounding grid based on similarity data analysis algorithm

RETRACTED ARTICLE: Structure optimization and preparation of power system grounding grid based on similarity data analysis algorithm

Transient Analysis of Multiphase Transmission Lines Located above Frequency-Dependent Soils

Tower Models for Power Systems Transients: A Review

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