高电压技术2018，Vol.44Issue(5)：1572-1579,8.DOI:10.13336/j.1003-6520.hve.20180430024
基于薄壳理论的大型接地装置有限元模型
Finite Element Model of Large Grounding Device Based on Shell Theory
摘要
Abstract
The performance of large grounding grid in complex soil structure is foundation of optimization design of the grounding device and the safe and stable operation of power system. We proposed a finite element model of large grounding grid based on the shell theory. To deal with the problem of difficult subdivision and large computation induced by traditional finite element method in dealing with large grounding grid, we prepared a long sheet metal instead of the grounding conductor and using the three prism shell element to scatter it, and proposed a method of the couple of twodimensional finite element and three-dimensional finite element. Then we established a finite element model of a substation grounding grid in different soil structure, and analyzed the impact of complex soil structure on performance of large grounding grid briefly. The results show that the introduction of the thin shell method can induce the amount of calculation, while the accuracy has been improved. The high resistance area in complex soil structure can reject the fault current, which can increase the ground potential and grounding resistance. In high resistance area, the current density is less, the surface potential distribution fluctuates in a wide range, and the contact potential and step voltage in high resistance area may be several times higher than that in the homogeneous soil. So when we calculate the performance and design the large grounding grid, the impact of complex soil structure should be taken into consideration.关键词
接地网/有限元方法/薄壳单元/复杂土壤结构/地表电位Key words
grounding grids/finite element method/shell elements/complex soil structure/surface potential引用本文复制引用
李景丽,李渊博,徐康,郭丽莹,贺鹏威..基于薄壳理论的大型接地装置有限元模型[J].高电压技术,2018,44(5):1572-1579,8.基金项目
国家自然科学基金(51307152).Project supported by National Natural Science Foundation of China (51307152). （51307152）
