Experimental Study of Transient Ground Impedances

Kosztaluk,; Loboda,; Mukhedkar,

doi:10.1109/mper.1981.5511930

Cited by 22 publications

(25 citation statements)

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“…In their analysis [22][23][24], they found that the earth resistance/impedance values under impulse are higher at the front time, and higher than that of steady-state values. However, at tail time, as the voltage and current are discharged to the ground, the earth resistance was found to decrease significantly.…”

Section: Voltage and Current Tracesmentioning

confidence: 99%

“…In some publications [22][23][24] the earth resistance/impedance under high impulse currents is defined as the ratio between instantaneous voltage and current, against the current, voltage or time. In their analysis [22][23][24], they found that the earth resistance/impedance values under impulse are higher at the front time, and higher than that of steady-state values.…”

Section: Voltage and Current Tracesmentioning

confidence: 99%

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Comparison between utility sub-station and imitative earthing systems when subjected under lightning response

Nor

Abdullah

Rajab

et al. 2012

International Journal of Electrical Power & Energy Systems

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Section: Voltage and Current Tracesmentioning

confidence: 99%

Section: Voltage and Current Tracesmentioning

confidence: 99%

Comparison between utility sub-station and imitative earthing systems when subjected under lightning response

Nor

Abdullah

Rajab

et al. 2012

International Journal of Electrical Power & Energy Systems

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“…The resistance was found to decrease with the increasing in currents. This resistance trend is similar to many publications in wet soils [1][2][3][4][5] and it was thought is due to both thermal and ionisation processes. However, in this investigation, since there is no water presence in the soil, the reduction of resistance is thought to be due to the ionisation process only.…”

Section: Voltage and Current Waveformssupporting

confidence: 90%

Impulse Impedance Tests on Laboratory Model Earth Electrode

Idris

Ahmad²,

Isa³

2005 Asia-Pacific Conference on Applied Electromagnetics

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The investigation was carried out with the purpose of obtaining more information about electric discharges in sandy media. A cylindrical setup was chosen for impulse testing of earth rods to simulate the voltage gradients in the field when lightning propagates to earth rod. The temperature images at the surface of the sand and rod were captured during the experiment. The surface temperature increased slightly higher with the increased of voltages. The CDEGS validates the increase of electric field higher at the edge of the cylindrical test cell. And also for the first time, the conduction current in dry sand was observed. It would be expected that the current produced in dry sand is due to soil ionization and also thermal effect due to charge movement in the soil, since there are air voids in the dry sand.

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“…To attain the soil ionization condition around the scale model electrodes, the experiments were conducted with surface current densities between 2 and 8 A/cm 2 as suggested in [7].…”

Section: Methodsmentioning

confidence: 99%

“…In 1981, Kosztaluk and others developed a model to simulate ionization-grounding zones by studying the transient behavior of ground impedances with surge arrester varistor blocks [7]. Later in 1984, Velazquez and Mukhedkar investigated the same behavior under high impulse currents by means of an equivalent circuit model for long ground electrode, considering the non-linear and linear behavior of soil.…”

Section: Introductionmentioning

confidence: 99%

One-port nonlinear electric circuit for simulating grounding systems under impulse current

Altafim

Gonçalves

Altafim

et al. 2016

Electric Power Systems Research

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a b s t r a c tA one-port nonlinear electric circuit to simulate grounding systems behaviors under high impulse currents is presented. The circuit is based on Loboda's and Pochanke's equations, which describe nonlinear behaviors of soil ionization phenomena. One of the major features of this nonlinear circuit is the possibility to simulate both ionization regions (linear and nonlinear) as a complete grounding system, in commercial simulation software such as Pspice, WorkBench ® , ATP or EMTP. In order to determine the linear and nonlinear circuit parameters, two known impulse current curves i(t) were applied on scale models and the corresponding impulse voltages U(t) were measured. From these circuit parameters, the U(t) × i(t) experimental curves were compared with one-port simulated results and the similarities, evaluated using the Area Under Curve (AUC) method, varied in the range 92-99%. In order to compare simulations with experimental data, a field circuit was elaborated to test three experimental scale models using single rods of different lengths.

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Experimental Study of Transient Ground Impedances

Cited by 22 publications

References 0 publications

Comparison between utility sub-station and imitative earthing systems when subjected under lightning response

Comparison between utility sub-station and imitative earthing systems when subjected under lightning response

Impulse Impedance Tests on Laboratory Model Earth Electrode

One-port nonlinear electric circuit for simulating grounding systems under impulse current

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