The traction power supply system(TPSS)is the power source to guarantee safe and reliable operation of urban mass transit. Evaluation of the reliability of the system is critical to reliability research of the whole Metro power supply system. In this paper, fault tree analysis (FTA) and failure mode and effects analysis (FMEA) were used to evaluate the reliability of one typical Metro TPSS. Firstly, the system was defined and the FMEA table was consummated. Then,through grading the system voltages,the fault tree model was built up and the minimum cut sets of the fault tree were got. Finally,by using the self-developed reliability analysis software,the reliability of three cases of power supply "was evaluated. Compared with the actual project,the validity and practical applicability of the reliability analysis method were verified.%地铁牵引供电系统是保证地铁安全可靠运行的动力来源,其可靠性分析对整个地铁供电系统的可靠性研究至关重要.本文针对某一地铁典型牵引供电系统结构,利用故障树和故障模式与后果分析法对其进行可靠性评估.通过对系统进行定义及对系统电压等级的划分,建立故障模式和后果分析表格及供电系统的故障树模型.在此基础上,求取故障树的最小割集,并利用自主开发的可靠性分析软件对3种供电情况进行可靠性评估.最后与实际工程相比较,验证了该可靠性分析方法的有效性和实用性.
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