| Title |
Analysis of Transient Ground Impedances Based on Soil Ionization under Impulse Voltage |
| Authors |
Hoe-Gu KimHoe-Gu Kim ; Bok-Hee LeeBok-Hee Lee |
| DOI |
http://dx.doi.org/10.5207/JIEIE.2016.30.8.051 |
| Keywords |
Soil Ionization ; V-I Curve ; Z-t Curve ; Lightning Impulse Voltage ; Transient Ground Impedance ; Finite Element Method |
| Abstract |
In this paper, the behavior of transient ground impedances in a coaxial cylindrical electrode system stressed by impulse voltages were experimentally investigated. The ground impedance-time characteristics and the voltage-current behavior for 4 types of soils were analyzed and discussed. Also, this paper modeled the electrode system into two-dimensional axial symmetry and analyzed the soil ionization growth and electric field distribution in the vicinity of the surface of the ground electrode. As a result, the ground impedance-time () curves are dependent on the types of soils. The voltage-current () curves for all sample soils show a ‘cross-closed loop’ of ∞-shape under ionization. When an impulse voltage is applied to the ground electrode buried in the ground, the electric field intensity around the ground electrode changes over time. It is known that transient ground impedance is dependent on the time-varying soil ionization in the vicinity of the surface of a ground electrode. |