Electrical Parameters Associated With Discharges in Resistive Soils

Espel, Patrick; Diaz, Ricardo Ruben; Bonamy, A.; Silva, J.N.

doi:10.1109/tpwrd.2004.829139

Cited by 23 publications

(10 citation statements)

References 12 publications

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“…where, Ec is in kVm -1 and ρ is in m Ω ⋅ [4]. In addition, it is shown that the residual soil resistivity in the ionization region is approximately 7% of the original soil resistivity based on the several experimental results [5], which is applied in the paper to model the performance of grounding system including the non-linear soil ionization phenomenon.…”

Section: Consideration Of Soil Ionizationmentioning

confidence: 99%

The FEM Analysis of Grounding System When Considering the Soil Ionization Phenomenon under Different Soil Structures

Wang

Jin

2011

2011 Asia-Pacific Power and Energy Engineering Conference

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A finite-element mode for the grounding system and soil is built in the software of ANSYS 10.0 to study the performance of grounding systems when considering the soil ionization phenomenon around the grounding system under different soil structures. The calculated results are validated by the simulation results found in the published papers. The performance of the grounding systems when considering the soil ionization effect at high-magnitude current are analyzed under different soil structures. Calculated results show that the distribution of earth surface potential is decreased when the soil ionization occurs. The soil structures are closely related to the performance of the grounding system and the soil ionization phenomenon are not easy to occur in the area of low soil resistivity, where the earth surface potential decreased more once the soil ionization occurs.

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Section: Consideration Of Soil Ionizationmentioning

confidence: 99%

The FEM Analysis of Grounding System When Considering the Soil Ionization Phenomenon under Different Soil Structures

Wang

Jin

2011

2011 Asia-Pacific Power and Energy Engineering Conference

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“…Also soil discharges are a critical factor to change in the transient performance of grounding systems, i.e., they may reduce the impulse impedance of grounding systems. Thus far, many researchers have realized extensive experiments in order to establish a model capable of describing the dynamic behavior of grounding electrode systems at high impulse voltages [2][3][4][5]. From many experimental and simulation results, it was concluded that the dynamic behavior of grounding systems at high impulse currents depends not only on the characteristics of soil ionization but also on the discharge mechanisms [6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Discharge Characteristics in Soils Subjected to Lightning Impulse Voltages

Kim¹,

Yoo²,

Lee³

2016

Journal of Electrical Engineering and Technology

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-In this paper, we present experimental results of the soil discharge characteristics as a function of moisture content when a 1.2/50-㎲ lightning impulse voltage is applied. For this study, laboratory experiments were carried out based on factors affecting the transient behavior in soils. The electrical breakdown voltages in soils were measured for a 0-6% range of moisture content for sand and a 0 -4% range of moisture content for gravel. A test cell with semi-spherical electrodes buried face-to-face in the middle of a cylindrical container was used. The distance separating the electrodes is 100 mm. As a result, the time-lag to breakdown in soils decreases as the amplitude of applied voltage increases. The time-lag to initiation of ionization streamer is decreased, with an increase in the moisture content. However, the formative time-lag is rarely changed. The behavior of soil discharges depend not only on the type of soil and its moisture content but also on the amplitude of the impulse voltage. When the test voltage is applied repeatedly, electrical breakdown occurs along different discrete paths, leading radially away from the injected electrode. i.e., the fact that the ionization streamers propagate in different paths from shot to shot was observed.

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“…To evaluate the performance of a grounding system subjected to current impulses, there is no consensus among authors about which quantities should be considered [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…From studies where the composition and soil moisture were controlled in the laboratory [7], it was concluded that the ionization of the soil is a very important phenomenon in discharge process because, under high current impulses, it reduces the soil resistance.…”

Section: Introductionmentioning

confidence: 99%

“…In paper [7] some definitions are presented: dielectric strength is considered as the value of the electric field intensity, which causes breakdown under homogeneous field configuration; inception current is the value of the injected current when the value of the transient impedance (because soil ionization), becomes lower than the low frequency resistance; discharge-guiding field is the minimal average field necessary for the discharge to cross the gap under inhomogeneous electric field configuration.…”

Section: Introductionmentioning

confidence: 99%

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Experimental impulse response of grounding systems

Castro

Costa

Freire

et al. 2012

2012 IEEE International Power Modulator and High Voltage Conference (IPMHVC)

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This work aims at proposing a methodology to perform an experimental evaluation of energized grounding grid systems, subjected to current impulses. By using an impulse generator (80 kJ/100 kV) impulses were generated 8/20 μs waveforms that were injected into the soil through a copper coated steel electrode. The applied voltage signal and the propagated signal in the soil were acquired by using a digital oscilloscope. The transient impedance and impulse coefficient were used as parameters to verify the grounding grid system performance.

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Electrical Parameters Associated With Discharges in Resistive Soils

Cited by 23 publications

References 12 publications

The FEM Analysis of Grounding System When Considering the Soil Ionization Phenomenon under Different Soil Structures

The FEM Analysis of Grounding System When Considering the Soil Ionization Phenomenon under Different Soil Structures

Discharge Characteristics in Soils Subjected to Lightning Impulse Voltages

Experimental impulse response of grounding systems

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