接地电阻测量回路中辅助电极位置的变化规律

The variation of auxiliary electrodes position in measuring circuits for grounded resistances

针对测量接地电阻时通常采用的三电极法所存在的不足,提出增加辅助电流极的个数,用多电极法测量接地电阻.从三电极法出发,导出了四电极、五电极、六电极、八电极法及任意电极法测量接地电阻时电位过零点、误差补偿点的表达式,并通过计算得出了随着电流极数目的增加电位过零点和误差补偿点的位置的变化规律.以四电极、六电极法为例,用电解槽模拟试验证明了理论分析和计算的正确性.

Aiming at the shortcomings of the grounded resistances for measuring in three electrodes method, the authors convinced that the number of auxiliary current electrode could be increased and the grounded resistances measured by the multi electrodes. On the basis of three electrodes method, the expressions for spot of zero potential and spot of the error compensation were educed when the grounded resistance being measured by four electrodes method, five electrodes one, six electrodes one, eight electrodes , and random electrodes ones. The calculation result showed the variation rules for spot of zero potential and spot of error compensation would increase with the increase of current electrode. Taken were four electrodes and six electrodes methods for example, the theoretical analysis and the calculation were proved to be correct by the simulative experiment of electrolytic tank.