Electrical breakdown of soil under nonlinear pulsed current spreading

Vasilyak, L. M.; Pecherkin, V. Ya.; Vetchinin, S. P.; Panov, V. А.; Сон, Э. Е.; Efimov, B. V.; Данилин, А. Н.; Колобов, В. В.; Селиванов, В. Н.; Ivonin, V. V.

doi:10.1088/0022-3727/48/28/285201

Cited by 15 publications

(2 citation statements)

References 16 publications

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“…On the current-voltage characteristic, overheating instability develops on a segment with negative differential resistance under the condition −dU/dI > R b at point B (figure 3), where load characteristic U = U 0 − IR b tangents the currentvoltage characteristic, U 0 -voltage on high-voltage generator. This condition holds for both conductive water [13] and wet sand [18,19]. On the current-voltage characteristic, point A is the voltage onset on high-voltage electrode; linear ohmic segment A−B corresponds to current spreading and heating of near-electrode region, from 0 to 1.4 ms, the voltage slightly drops due to capacitor discharging; point B-overheating instability development; on segment B−C the plasma channel prop agates toward the cathode, from 1.4 to 3.4 ms.…”

Section: 'Thermal' Modementioning

confidence: 89%

Slow ‘thermal’ and fast ‘streamer-leader’ breakdown modes in conductive water

Panov¹,

Vasilyak²,

Vetchinin³

et al. 2018

J. Phys. D: Appl. Phys.

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Investigation of pulsed electrical breakdown in conductive water has shown that at conductivity of 90 S cm−1 four different modes of breakdown are possible in the range of applied voltage from 9 to 27 kV in 1 cm gap with pin anode. At breakdown voltage of 9 kV, slow ‘thermal’ breakdown with the average speed of plasma channel propagation of 5 m s−1 takes place, while at the maximum studied voltage of 27 kV, fast ‘streamer-leader’ breakdown with the channel speed increased by three orders of magnitude (up to 7 km s−1) develops.

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Section: 'Thermal' Modementioning

confidence: 89%

Slow ‘thermal’ and fast ‘streamer-leader’ breakdown modes in conductive water

Panov¹,

Vasilyak²,

Vetchinin³

et al. 2018

J. Phys. D: Appl. Phys.

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“…Arc discharge in liquids always starts with the formation of gas region where electron avalanches, slow (primary) and fast (secondary) streamers may occur [2][3][4]. The same situation is observed for wet sand [5], where sand grains play the role of dielectric inclusions. On the next stage if conductivity is quite high it takes some time for hot plasma channel to reach opposite electrode.…”

Section: Introductionmentioning

confidence: 73%

Evolution of electrical discharge channel in isopropyl alcohol solution

Panov

Vasilyak

Pecherkin

et al. 2015

J. Phys.: Conf. Ser.

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Abstract. Evolution of the spark channel created by the high voltage pulse generator in 15% isopropyl alcohol solution in tap water was investigated experimentally. Fast camera images show the start of spark discharge channel with the anode region glowing, which is due to ionization-overheating instability near the surface of anode electrode. Measured propagation velocity is about 4 m/s and points to thermal process of channel evolution. Partial discharges in gas bubbles near the spark channel were observed. When the channel bridges the gap the cathode flash of lightning occurs which is much brighter than anode glowing and channel one. After destruction of the spark channel the cathode glowing stays for a longer period than anode one.

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