本文在大电机定子空心导体分层的基础上，推导了导体交流电阻的数值计算公式。
On the basis of stator hollow conductor layer building in large electric machines, the paper deduces numerical formula for calculating conductor alternating current resistance.
实验测量了两层水平分层土壤结构下的接地电阻和土壤电阻率，证实了土壤分层模型的有效性和可靠性。
Finally grounding resistance and soil resistivity are measured under the condition of two-layer horizontal soil, and the model is proved to be reasonable.
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