Transient Ground Impedance of Small-sized Needle-rod Electrodes due to Underground Soil Discharge

토양의 지중방전에 따른 소형 침봉전극의 과도접지임피던스

This paper deals with the transient ground impedance of small-sized needle-rod installed in a test field, Impulse voltage generator was used to inject lightning impulse on a ground electrode and modified fall-of potential method was proposed to measure the high ground potential rise. Transient ground impedance was analysed with impedance curve and I-V curve as respects the resistivity of soil. Soil ionization near the ground electrode is activated in high resistivity soil and have an effect on the reduction of transient ground impedance significantly.