수직매설 접지전극의 유효길이 산정에 대한 이론적 해석

초록

Lightning currents are one of major influences on the dynamic performance of ground electrodes. High lightning current intensity changes in the dynamic grounding performance due to ionization of the soil and very fast fronted pulses. The previous analysis has often been based on quasi-static approximation that is not applicable to very fast fronted pulses. To extend the analysis to fast fronted pulses in this paper, the full-wave analysis method based on the rigorous electromagnetic-field theory approach is used and the the effects of the ionization of the soil are disregarded. Based on the simulation resultsm, the empirical formulas applicable for slow and very fast fronted lightning current pulses are reviewed; therefore, the validity of the theoretical approach is verified through comparison between the calculated and measured results.