토양의 지중방전에 따른 소형 침봉전극의 과도접지임피던스

초록

This paper deals with the transient ground impednace 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 eect on the reduction of transient ground impedance significantly.