城市轨道交通直流牵引供电系统普遍存在接触网残压问题，直接威胁运营检修人员人身安全，停电作业时验电显示接触网带电，导致运营检修作业无法正常开展，送电时线路测试不通过，影响变电所正常送电合闸。本文以福州市轨道交通2号线竹岐停车场出入场线接触网残压问题为例，通过对接触网残压进行理论分析与计算，结合残压测试数据，分析接触网残压产生的原因，提出了一套降低接触网残压的措施。经现场实际测试，有效地抑制了接触网残压。

The catenary residual voltage issue of DC traction power supply system is common in urban rail transit. This issue is a direct threat to the safety of the operators and maintenance personnel. It shows that the catenary is energized during the electrical inspection for power outages. This will lead to the failure of normal operation and maintenance, and the failure of the line test. This also affects the normal operation of substations. This paper takes Fuzhou Metro Line 2 as an example, which has the catenary residual voltage issue at the entrance and exit lines of Zhuqi parking lot. The causes of the catenary residual voltage issue were analyzed based upon the theoretical analysis and calculation, combined with the residual voltage test data collected from experiments. Furthermore, the measures to reduce the catenary residual voltage were proposed. The on-site test results demonstrated that the proposed measures can effectively suppressed the catenary residual voltage.

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