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Abstract - In general, AT(Auto-transformer) is used to improve voltage sag and inductive interference in power lines and communication lines in AC electrical railway feeding system. Especially, Korean AT feeding system has different composition compared to other countries like Japan or France, so that it has some special characteristics. However, relays imported from other countries have been used in Korea, and settings of these relays should be modified and reflect distinct characteristics of Korean AT feeding system. Therefore, study about fault analysis based on modeled AT feeding system is important. In this paper, we modeled a single track AT feeding system by using PSCAD and analyzed fault current flow in case of trolley-rail short circuit fault. Finally, we presented current magnitude of each branch expressed by boosting current of AT.Key Words : AT Feeding System, Fault Current Analysis, Inductive Method, PSCAD†Corresponding Author : College of Information and Communication Engineering, Sungkyunkwan University, KoreaE-mail : hmwkim@hanmail.net* College of Information and Communication Engineering, Sungkyunkwan University, Korea** KOREA RAILOAD, KoreaReceived : July 3, 2015; Accepted : November 17, 2015

The Analysis of Trolley-Rail Short Circuit Current in a Single Track AT Feeding System