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A Study on the Protection Relay Test and Analysis Method of AC Electric Railway Substation



Author(s)

Dae-Seok Kang¹, Woo-Sik Won¹, Byung-Lib Ahn¹ and Byeong-Gon Lee²

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DOI:10.17265/1934-8975/2020.06.001

1. EntechWorld, Inc., 196 Gasan Digital 1-ro, Geumcheon-gu, Seoul 08502, Korea
2. Korea Railroad Corporation, 240 Jungangno, Dong-gu, Daejeon 34618, Korea

Since opening of the Korean high-speed railway in 2004, the rate of electrification has been increasing rapidly, and safety of the supply of AC railways has become very important. And the digital protection relays in railway feeding system need more attention with the expansion of unmanned SSs (substations) and digital SSs. For accident prevention, it is necessary to develop accurate modeling and simulation technology for railway feeding devices of electric railway. And it is also important to continuously improve test methods and develop excellent relay algorithms and apply them to the protection system to prepare for unexpected accidents. In this study, after reduced modeling the AC railway power supply system using PSCAD/EMTDC (Power Systems Computer Aided Design/Electromagnetic Transient DC Analysis), the results were compared and verified with the numerical calculation using the symmetric coordinate method. It also presents a method of using the verified results for simulation and education for various railway accidents. This study result will be used for the construction of new lines as well as existing lines in the future railway business.

Electric railway, digital protection relay, modeling, PSCAD/EMTDC.