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Mathematical Problems in Engineering
Volume 2013 (2013), Article ID 478637, 8 pages
Research Article

Impacts of Light Rail Transit Tram on the Voltage and Unbalance of the Distribution System

Department of Electrical Engineering, Southern Taiwan University of Science and Technology, Tainan 710, Taiwan

Received 10 September 2013; Accepted 4 October 2013

Academic Editor: Teen-Hang Meen

Copyright © 2013 Cheng-Ting Hsu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents the three-phase voltage and unbalance analysis for the distribution system with the loading of a light rail transit (LRT) tram. To investigate the dynamic responses of the system voltage and current, this paper adopts the Alternative Transients Program (ATP) software to model and simulate a multigrounded four-wire distribution system with an LRT loading. Two different definitions about unbalance are used to evaluate the problem. In this paper, the traction supply substation (TSS) with a single-phase transformer configuration is designed first for providing the electric power to the trams of LRT. However, it may result in the significant neutral line current and unbalance phenomenon to deteriorate the power quality of the distribution system. A Le-Blanc connection transformer in the TSS is therefore proposed to solve the problems.