대지저항률 측정의 정확도 평가

초록

Ground resistance is determined by the shape of grounding electrode and soil resistivity near the buried ground rod. The soil resistivity is practically measured by Wenner four-point method or three-point method measuring the ground resistance of the driven test rod. In this paper, the measurement accuracy of soil resistivity and the relation between the test electrode spacing in four-point method and the length of the driven test rod in three-point method are evaluated. The results obtained from both measuring methods are dependent with the soil structure and measuring conditions. The soil resistivity measured with a specified length of the driven rod in three-point method was in agreement with the result measured with a specified electrode spacing in Wenner four-point method.