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中文摘要：
文中介绍了接地的基本概念,分析了入地电流、跨步电压、最大允许温升以及直流接地极寿命;指出在设计直流接地极时,应考虑土壤电阻率、接地极型式以及接地参数的计算等方面的问题;阐述了直流接地电流对变压器直流偏磁的影响,并提出了抑制措施,如采用深层接地技术,变压器交流出线串联电容器,在变压器中性点装设抑制直流电流的装置等;最后分析了高压直流输电系统的共用接地极模式。
英文摘要：
Basic concepts of grounding are introduced in this paper.The earth current,the step voltage,the maximum allowable temperature rise and the grounding electrode life of high voltage direct current（HVDC） are analyzed.Main issues involved in designing HVDC grounding electrode are stated,such as soil resistivity test,grounding electrode type selection,and calculation of grounding parameters.The impact of HVDC grounding electrode on DC bias in transformer is expounded,and the corresponding suppression measurements are presented,such as the use of deep grounding technology,series capacitors at the AC outlet of transformer and installation of devices for DC current suppression at the neutral point of transformer,etc.Finally,the common grounding mode of HVDC transmission system is discussed.
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