| 摘要: |
| 电气化铁路外电源短路容量日益增大，牵引供电系统的回流具有特殊性。在高土壤电阻率地区，牵引变电所主接地网的设计成为难题。提出衡量接地水平的指标主要为接触电势、跨步电势、接地电阻、地电位升。针对典型土壤结构，分析对比中心扩网、延伸扩网、射线扩网、深井等主流降阻措施。通过大量的CDEGS平台仿真数据分析，总结出每一种降阻措施对接地指标的具体影响因素。通过对比措施的优劣，找出接地网降阻的规律，推荐最佳的方案。所用仿真参数为牵引变电所主接地网工程设计提供基础，验证了方案的正确性与可行性。 |
| 关键词: 牵引变电所 主接地网 工程设计 降阻措施 接触电势 |
| DOI：10.19783/j.cnki.pspc.200222 |
| 投稿时间：2020-01-06修订日期：2020-02-02 |
| 基金项目:中国铁路总公司科技研究开发计划课题资助(2017J005-C);中国铁建股份有限公司科技研究开发计划课题资助(2018-B12);川藏铁路科研课题资助(院科(川藏)19-26);中铁一院青年创新科研课题资助(院科19-84) |
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| Study on the design of a main grounding grid in a traction substation |
| WEI Guang |
| (State Key Laboratory of Rail Transit Engineering Informatization FSDI, Xi’an 710043, China) |
| Abstract: |
| The power supply source short-circuit capacity of electrified railway is increasing day by day, and the return current of the traction power supply system is important. In an area of high soil resistivity, the design of the main grounding grid of a traction substation becomes difficult. This paper proposes that the main indices for measuring the grounding level are contact potential, step potential, ground resistance and ground potential rise. Given a typical soil structure, the main resistance reduction measures such as central grounding grid expansion, extended grounding grid expansion, radial grounding grid expansion and deep well are analyzed and compared. Through a large amount of simulation data analysis of a CDEGS platform, the specific influencing factors of each resistance reduction measure to the ground index are summarized. By comparing the advantages and disadvantages of the measures, the law of resistance reduction of grounding grid is determined. The best scheme is recommended. The simulation parameters in this paper provide the basis for the design of the main grounding grid of the traction substation, and verify the correctness and feasibility of the scheme. This work is supported by Science and Technology R & D Program of China Railway International Co., Ltd. (No. 2017J005-C). |
| Key words: traction substation main grounding grid project design reduction measures contact potential |
