대지구조에 따른 매설지선의 과도접지임피던스 특성

초록

This paper presents the characteristics of grounding impedance of counterpoises buried at various soil structures. Grounding impedance measurements were made by the Fall-of-Potential method. The experiments were carried out in 50 m counterpoise of 25 mm2 buried at a depth of 0.5 m. The test current was injected by the impulse generator having the front time of 1∼60 ㎲. As a result, the soil structures greatly influences on the grounding impedance characteristics of counterpoise. The transient grounding impedances strongly depend on the injection point and the front time of impulse current.