在特高压直流输电(UHVDC)工程规划设计阶段需要进行地表电位的分布计算,参考了陕北换流站工程中府谷大柳树墕村接地极大地电磁测深(MT)法实测的大地分层电阻率数据,建立了6层大地土壤分层模型,并应用ANSYS计算了在额定运行工况下接地极方圆100 km范围内的大地电位分布.结果表明,接地极方圆2km范围内地电位下降迅速,不应规划建设电力、通信、铁道及管道等设施.所得陕北换流站地区已建及远景规划的各变电站及电厂的地电位分布结果,可对陕湖特高压直流输电工程单极运行调试提供参考.%The distribution of earth surface potential needs to be calculated in UHVDC engineering planning and design.Based on the stratified earth resistivity data measured by magnetotelluric sounding method (MT method) from one China converter station project located in Daliushu Yan Village,Fugu County of Northern Shaanxi,a 6-layer earth soil stratification model is established.The potential distribution in the range of 100 km around the grounding electrode is analyzed by ANSYS under rated operating condition.The results show that the electric potential decreases rapidly in the range of 2 km around the DC grounding electrode,where the facilities of electric power,communications,railways and pipelines shall not be planned and built.The earth surface potential distribution of the built and planned substations and power plants in the area around the Northern Shaanxi converter station has been calculated,and the results can be used as a reference for the single pole operation debugging of Northern Shaanxi-Hubei UHVDC transmission project.
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