Research On The Operation And Maintenance Strategy Of Key Equipment Of Urban Rail Transportation Power Supply System Based On Importance Analysis

With the adjustment of the national development strategy for urban rail transit,the development of urban rail transit in China has also shifted from the rapid construction stage to the high quality operation and maintenance stage,which has put forward higher requirements and standards for the operation and maintenance of various sub-systems and equipment of urban rail transit,especially the reliability and stability of the urban rail transit power supply system,which is the total source of power.The current O&M programme for urban rail power supply systems is basically based on the regular maintenance approach commonly used in large railway systems,which is based on experience and sets a fixed maintenance cycle for all types of equipment.In order to solve this problem,this paper develops a research on the operation and maintenance strategy of key equipment of urban rail transportation power supply system based on importance analysis.Firstly,the importance of critical equipment of urban rail transit is analysed in detail by combining two important assessment methods,namely Failure mode and effects analysis(FMEA)and Fault Tree Analysis(FTA),and the whole critical equipment of urban rail transit is analysed based on FMEA.The logical relationship and fault behaviour between the critical equipment and its respective subsystems and components,etc.Based on the FMEA tables established,a fault tree model of the whole system was then built based on the FTA analysis method,and the importance of the critical equipment in the system was calculated by qualitative and quantitative analysis.Then,the principles and characteristics of the three maintenance schemes of fault maintenance,planned maintenance and condition maintenance for critical equipment in urban rail power supply system were analysed,and the necessity of formulating different maintenance schemes for different power supply equipment was put forward.The structural model of the hierarchical analysis method is constructed according to the importance of each critical equipment,and the operation and maintenance plan of each critical equipment is determined through the construction of a reasonable mathematical model.Finally,for the critical equipment requiring regular maintenance,the degradation characteristics and rules were studied and a degradation model was constructed.The threshold value and maintenance interval combination are used to obtain the lowest O&M cost.Figures: 39,Tables: 46,References: 93.