A Dynamic Risk Analysis and Assessment Method for Traction System of Metro Train Based on Characteristic Quantity

Aiming at the characteristics of various fault risks, difficulty in quantifying risk factors and complex fault propagation mechanism of subway train traction system, in this paper, the typical faults frequently occurring in subway traction system is studied and the dynamic risk analysis and evaluation method of metro traction system is proposed. The fault event that the traction motor is difficult to operate normally due to the breakdown of the front end support capacitor of the traction inverter system is selected. By extracting the relevant characteristic quantity in the risk chain, the probability of the traction motor failure due to the breakdown of the support capacitor of the inverter system is obtained. The risk imp act combined with the relevant factors of metro op eration and maintenance is assessed using cluster analysis method. The proposed method takes the quantitative characteristic of fault risk propagation into account, and can overcome the problems that risks are difficult to quantify in traditional risk analysis methods.