基于故障树法的城市轨道交通牵引供电接触网可靠性分析

Analysis on the Reliability of Urban Rail Transit Catenary SystemBased on Fault Tree Method

分析了城市轨道交通牵引供电系统柔性及刚性接触网各自的特点、常见故障及差异,运用故障树分析法对两种接触网的可靠性进行研究。分别建立故障树失效模型,并作定性分析后找出导致接触网失效的最小割集,再通过定量分析得到顶事件的不可靠度和各底事件的结构重要度、概率重要度,然后进行排序后找到最易导致接触网整体失效的故障类型。分析结果表明,刚性接触网在可靠性上优于柔性接触网。这为接触网系统的可靠性评估提供了科学依据和手段。

After analyzing the characteristics of flexible catenary and rigid catenary respectively, the common faults and differences between them, fault tree analysis method is used to study the reliability of these two overhead catenary systems. By establishing a fault tree failure model, the minimum cut-set is found through qualitative analysis, while the unreliability of top event, structural importance and probability importance of bottom events can be obtained through quantitative analysis. By ranking all bottom events, the fault types that can easily cause failures in catenary system are also detected. The analytic result shows that the reliability of rigid catenary system is higher than that of flexible catenary system, providing the scientific basis and means for reliability assessment of overhead catenary system.