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Novel method for diagnosing corrosion of grounding electrodes in soil

机译：诊断接地电极在土壤中腐蚀的新方法

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摘要

Tower grounding electrodes buried in the soil are prone to corrosion. The current dissipation will be affected by corrosion. Accurate evaluation for the corrosion status of grounding electrodes is critical for the safe and stable operation of power system. At present, grounding resistance closely related to environmental soil resistivity is an important indicator for evaluating grounding performance. To eliminate the influence of soil resistivity, a method for diagnosing corrosion of tower grounding electrodes is proposed. The grounding resistance in soil of different resistivity can be equivalent to the grounding resistance in soil of reference resistivity to diagnose the corrosion degree under the unified diagnostic criteria. In this study, the corrosion deformation and corrosion products are analysed, and a model of horizontal linear tower grounding electrode with corrosion products layer is established. Calculation method of the grounding resistance for corroded electrode is studied. The relative grounding resistance is proposed as a corrosion diagnosis criterion and dividing the corrosion degrees based on the criterion. Finally, the error analysis of the diagnosis method are given, and the measurement and diagnosis system is studied through field experiments. Calculation and experiment results validated the accuracy of the proposed method.
机译：埋在土壤中的塔式接地电极易于腐蚀。电流耗散会受到腐蚀的影响。准确评估接地电极的腐蚀状态对于电力系统的安全稳定运行至关重要。目前，与环境土壤电阻率密切相关的接地电阻是评估接地性能的重要指标。为了消除土壤电阻率的影响，提出了一种诊断塔架接地电极腐蚀的方法。在统一的诊断标准下，不同电阻率的土壤中的接地电阻可以等于参考电阻率的土壤中的接地电阻，以诊断腐蚀程度。本研究分析了腐蚀变形和腐蚀产物，建立了带有腐蚀产物层的水平线性塔式接地电极模型。研究了腐蚀电极接地电阻的计算方法。提出将相对接地电阻作为腐蚀诊断标准，并根据该标准划分腐蚀程度。最后给出了诊断方法的误差分析，并通过现场试验研究了测量与诊断系统。计算和实验结果验证了该方法的准确性。

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