复杂艰险山区铁路牵引变电所接地网设计研究

我国即将建设以川藏铁路为代表的一大批复杂艰险山区的高标准铁路。受地质条件及电力系统影响,牵引变电所的接地设计将面临地形受限、高填方、土壤电阻率高、短路电流大等诸多困难和挑战。基于CDEGS软件建立的牵引变电所接地网仿真计算模型,分别对常规接地网、深井接地、外引接地以及提出的双层接地网模型进行仿真计算和指标考核,分析接地电阻、接触电势校核以及经济指标的对比。数据显示常规、深井及外引接地方式在地形受限的复杂环境中效果不明显,而双层接地网结构在经济、技术综合指标中最优。该方式在西成高铁的秦岭山区牵引变电所应用,效果非常明显,证明双层地网结构非常适合在复杂艰险山区铁路高填方地段的牵引变电所采用。

Research on Grounding Grid Design of Traction Substation on Complex and Dangerous Mountainous Railway

China will soon build a large number of high-standard railways in complex and dangerous mountainous areas, represented by Sichuan-Tibet Railway. Influenced by geological conditions and power system, the grounding design of traction substation will face many difficulties and challenges, such as limited terrain, high fill, high soil resistivity and large short-circuit current. Based on the simulation calculation model of traction substation grounding grid established by CDESS software, the simulation calculation and index evaluation of conventional grounding grid, deep well grounding, external grounding and the double-layer grounding grid model proposed by the author are carried out respectively, and the analysis of grounding resistance, checking of contact potential and comparison of economic indicators are conducted. The data show that the conventional, deep well and external grounding modes have no obvious effect in complex terrain-constrained environment, while the double-layer grounding grid structure is the best in terms of comprehensive economic and technical indicators. The application of this method in the traction substation of Qinling Mountains of Xi'an-Chengdu high-speed railway proves that the double-layer ground network structure is very suitable for the traction substation in high fill section of the complex and dangerous mountainous railway.