| Title |
Analysis of Transient Electrical Characteristics of Ground Rod Associated with Soil Discharges |
| Authors |
Hoe-Gu Kim ; Young-Jun Cha ; Bok-Hee Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2017.31.5.067 |
| Keywords |
Soil Discharge ; Soil Resistivity ; Overheating Instability Development ; V-I Curve ; R-t Curve |
| Abstract |
This paper presents experimental results of the effect of impulse current spreading from a ground rod installed in sand. Transient characteristics of ground rod associated with electrical discharges in soil were studied and dynamic voltage-current, resistance-time and conventional ground resistance characteristic curves were analyzed. As a consequence, a significant decrease in ground resistance was observed during the impulse current spreading in soil. The phenomenon is caused by the electrical discharges around the tip of ground rod. Time-lags to soil ionization are lengthened with increasing the current magnitude and the electrical breakdown appears at the wave tail of impulse voltage. The conventional ground resistance is exponentially decreased with impulse current. When electrical breakdown occurs in soil, on the voltage-current curves the overheating instability development appears the negative differential resistance (). |