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中文摘要：
高压直流输电可引起变压器直流偏磁问题。为定量描述直流偏磁对变压器的影响,介绍了所采用的土壤模型及接地极电位分布,详细阐述了＂二层地＂结构下的电位计算方法,并针对单环、双环接地计算出大地电位。分析了500 kV天广直流在单极接地运行方式下对220 kV某变电站的影响,得出该运行方式对该站的严重影响。
英文摘要：
Power transmission with high voltage direct current（HVDC）can cause transformers DC bias.This article introduces the model used in the soil and the ground electrode potential distribution,it also calculates the ground voltage in the case of a single and double ring grounding.Besides this paper describes the potential level of the two layers of soil structure calculation method and uses this method to analyze the influence of 220 kV substation under the 500 kV Tian-Guang HVDC monopole operation mode.The conclusion is that the operation mode has seriously affected the substation.
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