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이복희(Bok-Hee Lee),장근철(Kuen-Chul Chang),엄주홍(Ju-Hong Eom),김병근(Byung-Keun Kim),오성균(Sung-Kyun Oh),길형준(Hyung-Jun Kil) 한국조명·전기설비학회 2003 한국조명·전기설비학회 학술대회논문집 Vol.2003 No.-
To obtain a low ground resistance in high resistivity soil or in insufficient place such as downtown, long vertical ground rods are often used. However, if the lightning current or fault current with high frequency flows into the grounding system, the ground impedance is remarkedly increased. This paper presents how the impulse and fault current works on the long vertical ground rods associated with incoming points. When the test current was injected at the bottom of ground rod, the potential waveform of ground rod includes the oscillation with high frequency.