The residual resistivity in soil ionization region around grounding system for different experimental results

Liu, Yaqing; Theethayi, Nelson; Gonzalez, Raul; Thottappillil, Rajeev

doi:10.1109/isemc.2003.1236709

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…Residual resistivity of soil affects the earthing conductance of soil; thus, affecting the performance of earthing system during the soil ionization [14]. A typical residual resistivity value in the ionization region that is 7% of steady soil resistivity can be considered to simulate the ionization phenomenon as reported in [33,40]. For different soil models with different resistivity (50 Ω.m to 827 Ω.m) and different magnitude of lightning currents, the residual resistivity in the ionization region belongs in the range from 1.7 % to 47 % of the original soil resistivity as given in [21], [41][42][43].…”

Section: Soil Ionization Phenomenonmentioning

confidence: 99%

“…In this section, a horizontal earthing electrode with different length (10,20,40 and 60 m) and 0.0065 m radius buried in homogenous soil with soil resistivity 800 Ω.m and = 6 at a depth of 0.5 m are considered in the analysis. A high magnitude lightning current (50 kA, 8/20 µs) is injected at one end of the earthing electrode.…”

Section: Influence Of Conductor Length On Transient Voltagementioning

confidence: 99%

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Transient analysis of earthing electrodes considering soil ionization phenomenon under lightning impulse condition

Sengar,

Chandrasekaran

2023

Electr Eng

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This paper presents the transient behavior of an earthing system under the influence of lightning current injected in to it. Vertical rod and horizontal electrode buried in homogeneous soil are considered in this analysis. Statespace representation based transmission line methodology is adopted with non-linear parameters for modelling the earthing electrodes in the time domain. Soil ionization phenomenon is taken up with the presence of residual resistivity. In this method, soil resistivity variation is adopted to evaluate the soil ionization phenomenon that occurs due to changes in the electric field. This study incorporates mutual coupling between the electrode segments for low and high soil resistivity. Earthing electrodes are subjected to a high-magnitude of lightning current impulse with different peaks. Transient voltage and impulse impedance are calculated to analyse the transient behaviour of earthing electrodes with soil ionization. Impulse impedance of vertical earthing rods and horizontal electrodes are calculated and compared with the power frequency impedance. Percentage ohmic reduction between them is also reported. The influences of critical electric field, soil resistivity and lightning magnitude on transient performance of earthing electrodes are calculated. Also, an effect of the front time of lightning current impulse for a fixed peak on the impedance of the earthing electrode is evaluated and a significant amount of changes are observed. Simulated results are validated with the experimental and theoretical results reported in the literature, and good agreements are found.

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Section: Soil Ionization Phenomenonmentioning

confidence: 99%

Section: Influence Of Conductor Length On Transient Voltagementioning

confidence: 99%

Transient analysis of earthing electrodes considering soil ionization phenomenon under lightning impulse condition

Sengar,

Chandrasekaran

2023

Electr Eng

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“…Sand was chosen since it is easily wetted and dried without loss of physical properties. The hemispherical test setup was chosen because this type of geometry may provide a comparable configuration to that in commonly used earthing systems (Nor et al, 2006;Liu et al, 2003). This setup has been widely adopted during laboratory testing to compute soil parameters.…”

Section: Test Descriptionmentioning

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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Dynamic modeling of grounding device impact characteristics considering coupling of river seepage, water velocity and current dispersion

Li,

Zhu,

Bao

et al. 2024

Electr Eng

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The residual resistivity in soil ionization region around grounding system for different experimental results

Cited by 12 publications

References 7 publications

Transient analysis of earthing electrodes considering soil ionization phenomenon under lightning impulse condition

Transient analysis of earthing electrodes considering soil ionization phenomenon under lightning impulse condition

Sand's electrical parameters vary with frequency

Dynamic modeling of grounding device impact characteristics considering coupling of river seepage, water velocity and current dispersion

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