3점 전위 강하법을 이용하여 접지 저항을 측정하는 방법은 접지 전극과 전류 전극 그리고 전위 전극의 이격 거리 영향 관계에 따라 그 정확성이 결정된다. 하지만 실체 접지 시설을 요하는 현장에서 접지 저항을 측정하기 위한 공간 확보가 어려워 각 전극들의 정확한 위치 선정이 여의치 않는 경우가 발생할 수 있다. 이에 본 논문에서는 전위 전극의 이탈 범위와 접지 전극으로부터의 이격 거리에 따른 접지 저항 값의 오차를 측정하여 각각의 경우에 대해 통상적인 접지 저항 측정 방법에 의한 측정값과의 오차 범위를 분석해본다.
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