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http://dx.doi.org/10.5762/KAIS.2017.18.3.493

Reliability Analysis of EMU Static Inverters considering Influence of Temperature Stress Factor  

Park, Nam-Chul (Department of Railway Safety, Seoul National University of Science and Technology)
Song, Joong-Ho (Department of Electrical and Information Engineering, Seoul National University of Science and Technology)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.3, 2017 , pp. 493-500 More about this Journal
Abstract
Based on the data accumulated through EMU fault management, this paper examines the reliability of old railway car parts and proposes measurements to improve safety. Subway Line 7 of the Seoul Metropolitan Rapid Transit Corporation, auxiliary power unit (Static Inverter) of the EMU second version is a core equipment to supply power to various room-service units in cars and make an effect directly on passenger satisfaction. To analyze the pattern of failure throughout the field data over a long period of time, this analysis of statistics and reliability considers the operating environment and stress factors. This statistical analysis presents the correlation between failure and the temperature stress factors related to frequent failure occurring intensively in summer. In addition, throughout the analysis of the life of the IGBT inverter, the effect of the temperature stress factor was observed before and after the repair. As a result of an analysis of the optimal operating conditions considering two variations of EMU, such as variable load and outside temperature, a difference in the cooling capacity between the optimal operating conditions and frequent failure conditions was observed. Based on this analysis, this paper suggests a way to minimize cooling capacity difference for the optimal operational conditions.
Keywords
analysis of optimal operating condition; analysis of statistics and reliability; cooling capacity difference; correlation; stress factors;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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