HVDC单极大地运行时土壤结构对地电位和地中电流分布的影响

Influence of Soil Structure on Surface Potential and Ground Currents Distribution while HVDC Mono-polar Operation with Ground Return

推导了复合分层土壤结构模型的格林函数,计算了HVDC以大地为回路单极运行所致的入地直流电流引起的土壤地电位分布和地中电流分布,分析了不同土壤结构配置下流入变压器中性点直流电流的变化。研究结果表明,土壤结构对流入地电位分布和地中电流分布影响较大。此外,当直流极靠近海岸时,海水是一个要加以考虑的重要因素。

This paper derives the Green functions for a soil structure model with horizontal and vertical combined-layers, calculates the distribution of surface potential and ground current resulted from HVDC mono-polar operation situation with ground return, and analyzes the change of direct current flowing through transformer’s neutral point with different soil structure configuration. The results show that soil structures have a notable effect on the surface potential and the ground current distribution. In addition, seawater is a important fact that should be taken into account as DC earth electrodes near to sea side.