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http://dx.doi.org/10.5762/KAIS.2019.20.4.25

A Study on Operation Method of Protection Device for LVDC Distribution Feeder in Light Rail System  

Kang, Min-Kwan (Department of Electrical Engineering, Korea University of Technology and Education)
Choi, Sung Sik (Department of Electrical Engineering, Korea University of Technology and Education)
Lee, Hu-Dong (Department of Electrical Engineering, Korea University of Technology and Education)
Kim, Gi-Yung (Department of Electrical Engineering, Korea University of Technology and Education)
Rho, Dae-Seok (Department of Electrical Engineering, Korea University of Technology and Education)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.4, 2019 , pp. 25-34 More about this Journal
Abstract
Recently, when a fault occurs at a long-distance point in a LVDC (low voltage direct current) distribution feeder in a light rail system, the magnitude of the current can decrease to less than that of the load current of a light rail system. Therefore, proper protection coordination method to distinguish a fault current from a load current is required. To overcome these problems, this paper proposes an optimal algorithm of protection devices for a LVDC distribution feeder in a light rail system. In other words, based on the characteristics of the fault current for ground resistance and fault location, this paper proposes an optimal operation algorithm of a selective relay to properly identify the fault current compared to the load current in a light rail system. In addition, this paper modelled the distribution system including AC/DC converter using a PSCAD/EMTDC S/W and from the simulation results for a real light rail system, the proposed algorithm was found to be a useful and practical tool to correctly identify the fault current and load current.
Keywords
Light Rail System; LVDC; PSCAD/EMTDC S/W; Selection Protection Relay; Fault Current;
Citations & Related Records
Times Cited By KSCI : 7  (Citation Analysis)
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