| Summary: | 碩士 === 國立臺北科技大學 === 土木工程系土木與防災碩士班 === 106 === In recent years, the number of passengers of Taiwan Railway has a steady growth while the quality of service has been compromised due to an old overhead catenary system that has been operated over for more than thirty-eight years; accidents because of this dated System also has increased noticeably. Thus, to improve the reliability of the overhead catenary system becomes a matter of priority.
This study collects the statistics and analysis of the overhead catenary system accidents based on the data of power failure between years 2000 to 2017. Study finds that there are average 24.06 accidents occurred per year with 4.68 repairing hours per incident. The main causes are the intrusions of outside objects and random failure while the second cause that takes up to 44.57% of the whole pie is due to the malfunction of the mechanical parts-messenger wire-apparently becomes the most needed improvement item on the list.
Learnt from the risk analysis of the overhead catenary system in this study, the mechanical parts of messenger wires, contact wires and the poles yield to a higher level of risk, which requires to mitigate the risk to a lower level to an acceptable and reasonable range.
To elevate the operation safety of the railway, Taiwan Railway Administration has conducted the replacement project of messenger wires on the Western Line since 2015. Based on the economic appraisal of this replacement project in this study, the benefit-cost ration is 1.09 with a hypothetically 30-year construction time period, which makes this project feasible; while omitting the construction cost that would bring down the benefit–cost ration to 0.31 which does not reflect the economical feasibility, however, with the completion of this replacement project, it will reduce the equipment maintenance and repair work in the long run, meanwhile improves the punctuality of the train and the quality of the service.
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