城市轨道交通走行轨回流系统钢轨电位抑制技术综述
唐兆军1王颖2朱松涛3俞南均4郭志奇5何行健6
Overview of Rail Potential Suppression Technology in Urban Rail Transit Running Rail Circuit Return System
TANG Zhaojun1WANG Ying2ZHU Songtao3YU Nanjun4GUO Zhiqi5HE Xingjian6
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作者信息:1.杭州市地铁集团有限责任公司,310003,杭州
2.绍兴市轨道交通集团有限公司,312099,绍兴
3.国网浙江省电力有限公司绍兴供电公司,312035,绍兴
4.杭州市建设工程质量安全监督总站,310005,杭州
5.北京城建设计发展集团股份有限公司，100037，北京
6.中铁七局集团电务工程有限公司,450008,郑州
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Affiliation:1.Hangzhou Metro Group Co., Ltd.,310003, Hangzhou, China
2.Shaoxing Rail Transit Group Co., Ltd., 312099, Shaoxing, China
3.State Grid Zhejiang Electric Power Co., Ltd., Shaoxing Power Supply, 312035, Shaoxing, China
4.Hangzhou Construction Engineering Quality and Safety Supervision Station, 310005, Hangzhou, China
5.Beijing Urban Construction Design & Development Group Co., Ltd., 100037, Beijing, China
6.China Railway Seventh Group Electric Engineering Co., Ltd., 450008, Zhengzhou, China
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关键词:
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Key words:
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DOI:10.16037/j.1007-869x.2024.07.043
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中图分类号/CLCN:U239.5;U226
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栏目/Col:研究报告
摘要:
［目的］在城市轨道交通直流牵引供电系统中，钢轨电位超标和杂散电流问题已然成为运营线路的顽疾和通病，因此有必要对城市轨道交通走行轨回流系统钢轨电位抑制技术进行总结归纳。［方法］基于我国已运营线路的钢轨电位及杂散电流现状及突出问题，从直流牵引供电系统回流机理出发，梳理了直流牵引供电系统中影响钢轨电位的主要因素。介绍了钢轨电位抑制技术，并对并联电阻、并联电容及纳入闭锁电流逻辑保护定值等抑制操作过电压产生的几种方法进行了对比分析。介绍了联动屏蔽门新型钢轨电位限制装置、IGBT(绝缘栅双极晶体管)智能化杂散电流抑制型钢轨电位限制装置和柔性拓扑钢轨电位限制装置的技术方案。［结果及结论］通过电力电子全功率变换器拓扑单元对走行轨接地电压和电流进行动态柔性控制是极具潜力的治理措施，在未来可用于对走行轨回流系统中钢轨电位和杂散电流的综合控制。在线路设计阶段，针对不同制式需求，可通过提高牵引电压、优化牵引间距、降低轨道纵向电阻、避免场段库内走行轨直接接地等措施来降低钢轨电位。此外，正线与场段、线路与线路之间电气系统的完全隔离也是抑制钢轨点位的重要措施。
Abstracts:
［Objective］ In the DC (direct current) traction power supply system of urban rail transit, excessive rail potential and stray current issues are persistent problems and common ailments for operational routes. Therefore, it is necessary to summarize and generalize the rail potential suppression technology in urban rail transit running rail circuit return system. ［Method］ Based on the situation and prominent issues of rail potential and stray current in operational lines in China, starting from the mechanism of DC traction power supply system return flow, the main factors affecting rail potential in the system are sorted. A rail potential suppression technology is introduced, some methods for suppressing overvoltage generation are compared and analyzed, such as parallel resistors, parallel capacitors, and incorporating locking current logic protection set values. Technical solutions for the novel rail potential limitation device with linked shielding doors, the intelligent stray current suppression type rail potential limitation device using IGBT (insulated gate bipolar transistor), and the flexible topology rail potential limitation device are presented. ［Result & Conclusion］ By implementing power electronic full-power converter topological units, the dynamic and flexible control of rail-to-ground voltage and current demonstrates a highly promising remedial measure for future comprehensive control of rail potential and stray current in running rail circuit return system. During the line design phase requirements of different systems, rail potential reduction can be met by increasing traction voltage, optimizing traction spacing, reducing longitudinal track resistance, and eliminating direct grounding of running rails in depot garages. Additionally, complete isolation of electrical systems between mainlines and depots and between different lines is also an important measure to suppress rail potential.
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