樹木の接地抵抗測定における幹内電位分布

概要

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This paper describes the analysis of the potential distribution in the trunk for accurate measurement of earth resistance of a tree. The number of electrodes to be put into the trunk should be reduced to minimum because of damage to the tree. Potential distributions inside the trunk are calculated when a single or multi electrodes is/are used for the current injection into the trunk. According to the results of calculation, it is found out that the averaged value over the potential distribution at the base of the tree leads to the accurate measurement. Though the deviation of potential distribution around the base is not negligibly small using a single current injection electrode, the accurate value of earth resistance of the tree can be obtained when a potential pick-up electrode is set on the position showing the averaged value at the circumference of the butt. In the proposed method, two electrodes on the trunk satisfy the accurate measurement condition and minimize the damage to the tree.
2002-12-25