The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
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Characteristics of Impulse Discharges in Wet Soil

습한 토양의 임펄스방전특성

  • Kim, Hoe-Gu (Dept. of Electrical Engineering, Inha University) ;
  • Lee, Bok-Hee (Dept. of Electrical Engineering, Inha University)
  • Received : 2016.10.26
  • Accepted : 2017.01.11
  • Published : 2017.02.01
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Abstract

This paper presents the experimental results related to soil ionization and electrical breakdown in a concentric hemispherical electrode system under lightning impulse voltages. Dynamic voltage-current and impedance-time characteristics of soil ionization were measured and analyzed. Also the electrical breakdowns of the soil gap were investigated. The time-lag to the peak current corresponds to the soil ionization propagation. The time of ionization propagation in wet sand is found to decrease with increasing the impulse currents. A drastic decrease in ground resistance was observed during the impulse current spreading in sand. The electrical breakdown appears at the wave tail of impulse voltage and results in a wide scatter in V-t curves. The voltage-current curves have a fan-like shape attributed to ionization processes which result in increasing current and decreasing voltage.

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References

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