【摘要】 为青藏铁路供电的110kV沱沱河和五道梁变电站地处高寒永冻地区,如何分析得到变电站的土壤模型是设计接地系统的前提。根据土壤电阻率的现场实测结果采用土壤分层的反演理论分析得到了沱沱河和五道梁两变电站的土壤模型;通过统计分析两变电站地温的季节变化来确定冬季地表土壤的电阻率,以反映季节因素对土壤模型的影响;最后通过现场接地装置接地电阻的实测结果验证了土壤分层模型的合理性。不同季节土壤模型的建立为沱沱河和五道梁两变电站接地系统的设计奠定了基础。更多还原

【Abstract】 The 110 kV Tuotuohe and Wudaoliang substations supplying power for Qinghai-Tibet railway locate in high-cold permafrost area, how to obtain the soil models of the substations is the prerequisite of grounding system design. According to the on-site test results of soil resistivities in two substations, the multi-layered soil models for two substations are obtained by use of the inversion theory of soil lamination. By means of statistical analysis on the seasonal variation of the ground temperature of two substations, the resistivity of surficial soil in winter is determined to reflect the impact of seasonal factors on soil models. The rationality of multi-layer soil model is verified by actual measuring results of on-site grounding devices’ grounding resistances. Building up soil models in different seasons establishes the foundation for the grounding system design of two substations.更多还原