Measurement of Soil-Ionization Characteristics of Grounding and its Analysis using Dynamic Grounding Model

Yasuda, Yoh; Kondo, S.; Hara, Takehisa; Ikeda, Keiichi; Sonoi, Yasuo; Furuoka, Yoshihiro

doi:10.1541/ieejpes.123.718

Cited by 9 publications

(1 citation statement)

References 2 publications

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“…By means of current imitating, to some extent, the lightning current, the full scale tests of the grounding electrodes in the different soils performed, as a rule, on special proving grounds [4][5][6][7][8][9]. The impulse grounding resistances, from actual lightning currents, are still not reliably determined.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear impulse current spreading and electrical breakdown in soil

et al. 2014

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The results of laboratory experiments on the impulse current spreading from the spherical elec trodes and the breakdown occurring in quartz sand of various humidity at the impulse voltages of 20-40 kV are presented. It is shown that, at the current densities on the electrode above some critical value, a sharp non linear decrease of the impulse grounding resistance occurs, an ionization superheating instability develops, and thus the current contraction takes place and a plasma channel in the soil occurs. A method is proposed to determine the critical strength of the ionization electric field. It was discovered that, at long discharge gaps in humid sand, the breakdown develops with a long time delay, similarly to thermal breakdown.

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Section: Introductionmentioning

confidence: 99%

Nonlinear impulse current spreading and electrical breakdown in soil

et al. 2014

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Electrical breakdown of soil under nonlinear pulsed current spreading

Vasilyak¹,

Pecherkin²,

Vetchinin³

et al. 2015

J. Phys. D: Appl. Phys.

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Influence of Nonlinear Processes in Soils on the Impulse Resistance of Grounding Electrodes

Ivonin

2021

J. Phys.: Conf. Ser.

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The article presents the results of laboratory studies of nonlinear processes during the flow of pulsed currents into moistened soil from electrodes modelling grounding devices of electric power facilities. A methodology for studying the pulse parameters of grounding devices has been developed and a laboratory stand and a generator measuring system have been developed on which these investigation were performed. The experiments were carried out on three types of electrodes at voltages of 20 - 50 kV and pulse durations from units to hundreds of microseconds. The article presents the combined results of optical and oscillographic studies. It is shown that the cause of the formation of spark channels during the nonlinear spreading of the pulsed current in the soil, when there is a sharp decrease in the grounding resistance, is the ionization-overheating instability that occurs when the current density on the electrode is greater than the critical one. The development of instability leads to an inhomogeneous current distribution and the appearance of spark channels. On the basis of experimental data, the current-voltage characteristics of the electrodes are obtained.

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Measurement of Soil-Ionization Characteristics of Grounding and its Analysis using Dynamic Grounding Model

Cited by 9 publications

References 2 publications

Nonlinear impulse current spreading and electrical breakdown in soil

Nonlinear impulse current spreading and electrical breakdown in soil

Electrical breakdown of soil under nonlinear pulsed current spreading

Influence of Nonlinear Processes in Soils on the Impulse Resistance of Grounding Electrodes

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