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http://dx.doi.org/10.7782/JKSR.2016.19.4.436

Analysis of Resonant Characteristics in High Voltage Windings of Main Transformer for Railway Vehicle using EMTP  

Jeong, Ki-Seok (Metropolitan Transit Convergence Research Division, Korea Railroad Research Institute)
Jang, Dong-Uk (Wireless Power Transfer System Research Team, Korea Railroad Research Institute)
Chung, Jong-Duk (Metropolitan Transit Convergence Research Division, Korea Railroad Research Institute)
Publication Information
Journal of the Korean Society for Railway / v.19, no.4, 2016 , pp. 436-444 More about this Journal
Abstract
The primary windings of the main transformer for rolling stock have several natural frequencies that can occur internal resonance with transient voltages induced on a high voltage feeding line. Factory testing is limited in its ability to determine whether or not transient voltage with various shape and duration can be excitable. This study presents the design of a high voltage windings model and simulation and analysis of the internal resonant characteristics in terms of the initial voltage distribution and voltage-frequency relationship using the electromagnetic transients program (EMTP). Turn-based lumped-parameters are calculated using the geometry data of the transformer. And, sub-models, being grouped into the total number of layers, are composed using a ladder-network model and implemented by the library function of EMTP. Case studies are used to show the layer-based voltage-frequency relationship characteristics according to the frequency sweep and the voltage escalation and distribution aspects in time-domain simulation.
Keywords
Railway vehicle; Transformer winding; Internal resonance; Electromagnetic transients program(EMTP);
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