接地极接地电阻计算公式应用分析与推荐公式

Application Analysis and Recommended Formula of Grounding Resistance Calculation of Grounding Electrode

常用接地极接地电阻计算式一般基于接地极理想模型及中点电位法和平均电位法推演而来,但由于所取电位位置的差异,两种电位法之间的计算结果是存在差异的。通过算例分析不同算法之间的差值情况,结合分析接地极埋深对其接地电阻的影响,对比分析规范中所采用的简化计算公式存在的偏差,根据计算公式的简化条件,为不满足常规简化条件的接地极接地电阻计算提供了偏差较小的计算公式,可为对接地极敷设方式提供参考。

The formula for calculation of common grounding electrode grounding resistance is generally derived based on the ideal grounding electrode model and the mid-point potential method and the average potential method.However,due to the difference in the potential positions,the calculation results between the two potential methods are different.The difference between different algorithms is analyzed with an example,combined with the analysis of the influence of the buried depth of the ground electrode on its grounding resistance,and the deviation of the simplified calculation formula used in the specification is compared and analyzed.According to the simplified conditions of the calculation formula,the paper provides a calculation formula with a small deviation for the calculation of the grounding resistance of the grounding electrode that does not satisfy the conventional simplified conditions,which can provide a reference for the laying mode of the grounding electrode.