In contrast to the present ground resistance measurement methods recommended by national standard, this paper proposes a generalized three-electrode measurement method, in which the voltage measurement electrode can be arbitrarily located on a circle. Based on the impedance formulas of the three-electrode measured electrode system, the center location and the radius of this circle are given. To verify the validity of the proposed method, the grounding resistances of single vertical and combined grounding electrodes are measured by the straight line method, the triangle method and the proposed method. The results from all these methods shows that the proposed method is practical in engineering measurement of grounding resistances. Furthermore, the location of the electrode in the proposed method is flexible and convenient for wire layout.%推荐一般化三电极接地电阻测量方法.运用此方法可以将电压测量电极在一圆形轨迹上任意位置移动.根据三电极测量布极系统的阻抗计算公式推导出此圆形轨迹的圆心位置和半径,为了校验该一般化方法,与国际推荐的直线法、三角形法进行比较,测M了单根垂直接地体和组合接地体的接地电阻,结果表明3种方法测得的数据都能够较好地吻合,证明该一般化测量方法具有可行性,且测量电极设置位置灵活,不受测量现场地形和地貌的限制,便于布线实施测量.
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