Grounding system modeling in EMTP/ATP based on its frequency response

Vargas, Mauricio; Rondón, Daniel; Herrera, J.; Montaña, Johny; Jimenez, D.; Camargo, Mariza; Torres, Horacio; Duarte, Oscar

doi:10.1109/ptc.2005.4524514

Cited by 4 publications

(4 citation statements)

References 6 publications

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“…This circuit was formed by RLC branches whose frequency response up to 2MHz is quite similar to the one calculated from the GS. The SC model exhibits a good agreement with field measurements as shown in [6], and a more detailed description of this technique is presented in such reference.…”

Section: Synthesized Circuit -Scsupporting

confidence: 55%

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Influence of grounding system modeling on Transient analysis of transmission lines due to direct lightning strike

Rondón

Vargas²,

Herrera³

et al. 2005

2005 IEEE Russia Power Tech

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The aim of this paper is to implement different grounding system (GS) models in order to compare its influence on the calculation of overvoltages in transmission lines, produced by direct lightning strikes. The models studied were a lumped DC resistance, a non linear resistance, and a synthesized circuit based on the frequency response of the GS. The latest model is proposed by the authors and takes into account the frequency dependent transient behavior of the GS.The overvoltages simulations were carried out by means of the EMTP-ATP program.

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Section: Synthesized Circuit -Scsupporting

confidence: 55%

“…The synthesized circuit for this function is then: Finally, a comparison between the frequency response obtained from the synthesized circuits and the simulation using electromagnetic models [6] is shown in figures 7 and 8. IV.…”

Section: ) Case 2 Tl2mentioning

confidence: 99%

Influence of grounding system modeling on Transient analysis of transmission lines due to direct lightning strike

Rondón

Vargas²,

Herrera³

et al. 2005

2005 IEEE Russia Power Tech

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“…3. The formulae to compute each electric parameter can be found in (Vargas et al, 2005). Once the equivalent circuit of the vertical electrode is obtained, this circuit is incorporated in the GG circuit and the transient voltages can be computed by any EMTP-type programs.…”

Section: Lumped Approach For Vertical Electrodes In a Stratified Soilmentioning

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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“…Future work can use the methodology proposed by Montaña et al, (Montaña et al, 2005), (Montaña, 2006) and Nor, Haddad and Griffiths (Nor et al, 2006) for studying others types of soil and other voltage levels.…”

Section: Resistivity and Permittivity Valuesmentioning

confidence: 99%

Sand's electrical parameters vary with frequency

Chaparro¹,

Candelo-Becerra²,

Velasco

2012

Ing. Inv.

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This paper presents the results of two types of test in one kind of sand to obtain resistivity and permittivity values for frequency ranging from Hz to MHz. One test involved wave generation at specific frequencies and the other an impulse generator (continuous frequency spectrum). Tests were made for three humidity values. The results of both test revealed non-linear performance on test electrode surface. Such non-linearity was modelled and eliminated to give the permittivity and resistivity values in frequency domain.

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Grounding system modeling in EMTP/ATP based on its frequency response

Cited by 4 publications

References 6 publications

Influence of grounding system modeling on Transient analysis of transmission lines due to direct lightning strike

Influence of grounding system modeling on Transient analysis of transmission lines due to direct lightning strike

Transient Voltages on Grounding Grids buried in Stratified Soils

Sand's electrical parameters vary with frequency

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