Analysis on the unbalanced loop current of the traction power supply

Shi, Xiao; Ma, Yunshuang; Wen, Yinghong; Zhao, Xiuli

doi:10.1109/mape.2013.6689885

Cited by 2 publications

(1 citation statement)

References 4 publications

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“…The traction current is supplied by the pantograph over the locomotive and flows into the rails through the wheels from the locomotive transformer and the locomotive load [17]. Due to the imbalance of the following factors: impedance of the two rails, the ground equipment and their earth impedance, the contact impedance between the discharge wheels and the rails, etc., the overall impedance of the two traction current loops are not equal, finally leading to the traction current distributed in the two rails unequal; i.e., the unbalanced traction current is formed [18,19]. While the locomotive is swaying and vibrating during the running process, the contact resistances between the two discharge wheels and the rails are usually different slightly.…”

Section: Analysis and Theoretical Calculation Of Magnetic Coupling Prmentioning

confidence: 99%

Quantitative analysis on coupling of traction current into cab signaling in electrified railways

et al. 2020

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Cab signaling apparatus is the critical equipment for ground-vehicle communication in electrified railways. With the rapid development of high-speed and heavy-haul railways, the immunity to unbalanced traction current interference for cab signaling apparatus in the onboard train control system is increasingly demanded. This paper analyzes the interference coupling mechanism of the ZPW-2000 track circuit. Based on electromagnetic field theory and the actual working parameters, a calculation model is established to complete the quantitative research of the cab signal induction process and traction current interference. Then, a finite element model is built to simulate the process. The simulation results under the signal frequency, fundamental and harmonic interference are all consistent with the theoretical calculation results. The practical measurement data verify the coupling relationship between cab signal inductive voltage and rail current. Finally, an indirect immunity test method applying this relation for the cab signals is proposed, and the voltage indexes of the disturbance sources are determined, i.e., the test limits. The results provide an accurate quantitative basis for the cab signaling research and design of the immunity test platform; besides, the proposed indirect test method can simplify the test configuration and improve test efficiency.

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Section: Analysis and Theoretical Calculation Of Magnetic Coupling Prmentioning

confidence: 99%