| Summary: | 碩士 === 國立臺北科技大學 === 電資碩士在職專班研究所 === 102 === Typical AC electrification current return system (ECRS) is composed of three parts: return current rails, earth wires (return feeders), and equalized bonding wires (EBWs). Electrification current returns to the traction power substations through this system. Notably, the setting of EBWs has critical influence on the distribution of currents, and then may affect rail voltage and rail leakage current. Therefore, a systematic investigation is necessary. Herein, this thesis takes Eastern Line of Taiwan Railway system as an example for analysis.
First of all, the paper explores the configuration and electrical parameters of the return current rail, the earth wires, the EBWs of the ECRS. Then, modeling and analysis based on the alternative transients program (ATP) of electromagnetic transient analysis program are presented. Through setting different spans of the EBWs along the railway, the rail potential and current, the current distribution on the earth wire and EBWs, at different train locations are analyzed. In addition, a multi-channel recorder is used for the measurements on system impedance, return currents and current rates of rail and earth wires, and to study the relationship between the configuration of EBWs and the reduction of current leakage to earth. Analysis and measurement results show that the return current rate can be increased slightly by the layout of denser deployment of EBWs. Here, other related factors should be considered for determing the increase of EBWs.
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