I-maintenance - ALSTOM's approach to condition based maintenance of rolling stock

Author(s):  
A. Chater

Author(s):  
Lamont B. Ward

Commuter and passenger railroads invest large amounts of capital to purchase and maintain their rolling stock. Funding for maintenance is largely derived from operating budgets with some funds coming from other sources. Realizing maintenance is vital to the safety and operations of their rolling stock, railroads use maintenance methodologies found in other industries along with government regulations and in-house practices to determine the best maintenance practice for their fleet. By using Condition Based Maintenance, Life Cycle Maintenance, and Reliability Centered Maintenance, railroads have increased reliability by isolating unreliable parts and performing corrective actions when needed. This increases scheduled maintenance and reduces unscheduled maintenance. However, unscheduled maintenance still impacts operations and reliability for railroads. Rolling stock repair costs due to unscheduled maintenance are not captured or analyzed so further improvement can be made in this area.



1893 ◽  
Vol 35 (896supp) ◽  
pp. 14312-14313
Keyword(s):  


1911 ◽  
Vol 72 (1858supp) ◽  
pp. 107-107
Keyword(s):  


Author(s):  
Dmitri Vinnikov ◽  
Tanel Jalakas ◽  
Indrek Roasto

Analysis and Design of 3.3 kV IGBT Based Three-Level DC/DC Converter with High-Frequency Isolation and Current Doubler RectifierThe paper presents the findings of a R&D project connected to the development of auxiliary power supply (APS) for the high-voltage DC-fed rolling stock applications. The aim was to design a new-generation power converter utilizing high-voltage IGBT modules, which can outpace the predecessors in terms of power density, i.e. to provide more power for smaller volumetric space. The topology proposed is 3.3 kV IGBT-based three-level neutral point clamped (NPC) half-bridge with high-frequency isolation transformer and current doubler rectifier that fulfils all the targets imposed by the designers. Despite an increased component count the proposed converter is very simple in design and operation. The paper provides an overview of the design with several recommendations and guidelines. Moreover, the simulation and experimental results are discussed and the performance evaluation of the proposed converter is presented.





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