봉형접지전극 주변에서 토중방전현상에 대한 실험적 고찰

초록

Modern electronic equipments are becoming very important in important in information oriented society, but they are vulnerable to lightning surges. Soil resistivity in the vicinity of grounding electrodes may be affected by the current flowing from the grounding electrodes into the surrounding soil. Electrical conduction in soils depends on the grain size, compactness, and variability of the grain sizes. When a high current is injected into the soil, and the breakdown phenomenon occur. In the present work, electrical behaviors related to discharge in soils were investigated. The breakdown voltages in soil were lower than that sparkover voltage in air. The breakdown voltage in the gravel layer is relatively low, and the breakdown was caused by the flashover through the surface of gravels.