Abstract: This paper surveys the situation of existing rail traction current return of Beijing-Tianjin Block Post on Beijing-Shanghai High-Speed Railway, and analyzes the requirements and constraints of signaling and traction power supply related standards, specifications and products on rail traction current return. On this basis, it studies the factors that need to be considered for rail traction current return, and proposes the measures of minimizing current return breakpoints, shortening current return channels, and adding grounding wires and boosting cables on the basis of two conditions, i.e., ensuring smooth current return channels and avoiding the formation of a "third rail" that affects track circuit safety. In view of the actual situation of Beijing-Tianjin Block Post, it presents two schemes, i.e., connection through double-slip turnouts for current return and connection through horizontal connections for current return. After in-depth analysis and comparison, it finally proposes that direct connection on both sides of insulation for rail traction current return should be prioritized for railway block posts.

Key words: Beijing-Tianjin block post, traction current return, choke transformer, horizontal connection, double-slip turnout

摘要： 调研京沪高铁京津线路所既有钢轨牵引回流的情况，分析信号专业与牵引供电专业相关标准、规范及产品对钢轨牵引回流的要求与制约条件。在此基础上研究钢轨牵引回流需要考虑的因素，提出应当在保障回流通道畅通、避免形成“第三轨”影响轨道电路安全两个基础前提下，尽量减少回流断点、缩短回流通道长度、增加接地与吸上线。结合京津线路所的实际情况，给出通过双动道岔沟通回流和通过横向连接沟通回流两种方案，进行深入的分析与比较，最终提出对于线路所应优先采用直接沟通绝缘两侧钢轨牵引回流的方式。

关键词: 京津线路所, 牵引回流, 扼流变压器, 横向连接, 双动道岔