分析High Voltage Direct Current (HVDC)输电系统大地回路运行时地表电位分布,是评估地下金属管道腐蚀、变压器直流偏磁、通信干扰等不良效应受接地极电流影响的前提。本文利用镜像法和电磁波的折射、反射规律,创新地推导出N层垂直和水平复合分层的地表电位的解析公式,然后利用这个解析公式解决华东地区地表电位分布的实际问题,通过不同模型计算结果的反馈得到华东地区理想的仿真模型,最后用多项式插值将电位曲线进行拟合,得到华东地区地表电位的一般函数表达式。
英文摘要:
analyzing the distribution of earth surface potential (ESP) of High Voltage Direct Current (HVDC) operation with ground return, which is the premise of evaluation of underground metal pipeline corrosion, transformer DC bias, communication interference and other adverse effects by electrode current. This paper uses images method, the law of transmission-reflection and transmission-refraction of electromagnetic wave to deduce innovatively the resulting formula of ESP in the N-layers soil construction partitioned by horizontal and vertical planes. After that, a practical problem of East China ESP is solved by the formula. In addition, a compare about the simulation result of different soil model of East China is made to get an ideal model. Finally, the general function expression of the East China ESP is presented by using polynomial interpolation to fit potential curve.