Research On Reliability And Safety Evaluation Method Of Metro Power Supply System

With the development and advancement of social economy, Urban Rail Transit Systems plays more and more important in urban development and people daily life, power supply system offers the current source to it, if current supply breaks, not only transport of urban rail transit interrupts, but also damages people's life and property. So analysis and improve the reliability and safety of the metro power supply system has come to more attention.First, the thesis emphasis on the reliability analysis of the traction power supply system. Against the self characteristic of traction power supply system and definition of reliability, the concept of metro traction power supply system reliability is discussed, and also its evaluation index system are generalized, for the failure data of the traction power supply system of Guangzhou metro line 1 in the year 2003 and 2004 as an example, the reliability index of this line are calculated. Viewed from structure reliability in this dissertation, metro traction power supply system is divided into three parts, traction power substation, catenary system and power supply partition, the reliability analysis of the three parts are gained in this thesis, create Failure Modes and Effects Analysis (FMEA) table, through the table found potential fault model, generalized check method of the fault and remedial measures, then the qualitative analysis and the quantitative analysis on the reliability is conducted with Fault Tree Analysis (FTA) method, minimal cut set and structure reliability of the fault tree are gained through qualitative analysis, the failure rate of the top event are calculated through quantitative analysis.Secondly, a safety analysis method for metro power supply system is researched. Preliminary given its safety grade concept, and divided it into five classes, extraordinary safety, very safety, safety, basic safety and un-safety, obtained safety evaluation index system, according to four experts evaluating situation, obtained number of the factors in evaluation sets. Adopted Fuzzy Comprehensive Evaluation (FCE) to analysis the safety of metro power supply system and used the example to illustrate, generalized methods and means to improve the safety of power supply system.Through research on reliability and safety method, suitable evaluation methods are given for metro power supply system, examples are demonstrated the superiority and practicability of the two methods of which FMEA and FTA, also demonstrated the availability of FCE.