中国部分城市轨道交通采用工频单相交流制式，以提升列车的运行速度和运输能力。牵引供电系统发生故障时，有可能采用单侧停电抢修方案，如果此时接触网的感应电压过高，将对检修人员造成安全威胁。依据广州地铁 22 号线设计资料，搭建地铁隧道的仿真模型，计算得到一侧线路停电检修，另一侧线路正常运行时接触网上的感应电压，获得牵引电流、隧道之间的距离等因素对感应电压的影响规律。发现采用单端接地方式时，接触网上的感应电压将超过安全标准，可通过双端接地方式将感应电压降到安全限值以下。根据上述研究结果，交流供电制式下城轨进行单边停电作业时，检修区间的接触网必须采用双端接地方式。该结论可为地铁管理部门制定安全措施时提供参考。

Some rail transit systems in China adopt a power frequency single-phase AC system to improve the running speed and transportation capacity of trains. When the traction power supply system fails, a one-sided power outage emergency repair scheme may be adopted. If the induction voltage on the catenary is too high, it harms the maintenance personnel. In this study, a simulation model of a subway tunnel was built based on the design data. The induced voltage on the overhead catenary line is obtained when it is cut off for maintenance, and the other side of the line is in regular operation. The influences of the traction current, distance between the tunnels, and other factors on the induced voltage were also determined. It was found that the inductive voltage on the overhead catenary line exceeded the safety level when the single-ended grounding mode was adopted. If the double-ended grounding mode is adopted, it will be reduced to below the safety limit. Based on the above research results, this study proposes that when the subway unilateral power outage maintenance operation is adopted in the AC power supply system, both ends of the maintenance interval must be grounded. The conclusion of this study can be used as a reference for subway management departments to formulate safety measures.

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