| Safety risk management is one of the most important research problems in engineering management.With the rapid development of China's economy and the increase of population,the city scale is getting larger and larger,and the pressure on urban traffic is gradually highlighted.Urban rail transit(URT),as a kind of transportation mode with less occupation of existing road resources,large traffic volume,fast speed and high punctuality,is playing an increasingly important role in urban development and People's Daily life.Among them,the power supply system of urban rail transit,as an important equipment system providing power for the operation of the entire rail transit system,will cause the entire rail transit system to be paralyzed once the power supply is interrupted,threatening the safety of passengers' lives and bringing serious property losses.Therefore,it is of great practical significance to study the power supply system security risk of subway projects.So far,the existing safety risk assessment of traction power supply system mainly focuses on a single traction substation or catenary,ignoring the relationship and influence among various parts of the subway traction power supply system,and cannot accurately evaluate the safety risk factors of the entire subway traction power supply system.At the same time,fault diagnosis method based on fault tree analysis is widely used in practical fault diagnosis.Especially in recent years with the gradual maturity of computer technology and the popularization of computer applications fault tree analysis has a broader market space.At present,fault analysis(FTA)has been widely used in aerospace,aviation,nuclear energy,electronics,chemical industry,machinery and other industries at home and abroad,with a broad development prospect.At present,there are few studies on the safety risk analysis of traction power supply system for urban rail transit projects,especially for the DC 1500V power supply system of Qingdao metro line 11 project.Currently,there is no relevant research on equipment operation safety risk management with equipment operation data.Firstly,this paper expounds the purpose and significance of this paper,and summarizes the research status of safety risk management theories and methods related to urban rail transit traction power supply system at home and abroad.From analysis constitute Qingdao metro line 11 project of each component of traction power supply system,determine the top event of the fault tree,and combined with 11 line project since the commissioning and trial operation as of the date of 1 year and a half of a total of 843 stop fault record,step by step down analysis it is concluded that the basic events of the fault tree,the traction power supply system of the safety risk factors.After that,the fault tree model structure diagram is drawn.After analyzing and sorting out the fault records,the probability of the occurrence of basic events is obtained,and relevant formulas are used to analyze and calculate the structural importance and probability importance of the fault tree model,and finally the critical importance of each basic event is obtained.The critical importance degree of each basic event is arranged from large to small,which is to rank the importance degree of each risk factor's influence on the operation safety risk of traction power supply system.Finally,according to the importance of various risk factors obtained through analysis,countermeasures are formulated for key risk factors to provide strategic reference for relevant construction,construction,design and operation and maintenance units in trial operation support,so as to improve the operation reliability of subway traction power supply system and ensure the safe and smooth operation of subway. |
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