Mechanism Analysis of Sympathetic Inrush in Traction Network Cascaded Transformers Based on Flux-Current Circuit Model

Zhiyong Li, Zhijie Jia, Kailong Xi and Yougen Chen
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Zhiyong Li: School of Automation; Central South University; Changsha 410083, China
Zhijie Jia: School of Automation; Central South University; Changsha 410083, China
Kailong Xi: School of Automation; Central South University; Changsha 410083, China
Yougen Chen: School of Automation; Central South University; Changsha 410083, China

Energies, 2019, vol. 12, issue 21, 1-15

Abstract: When electric multiple units (EMU) pass the neutral zone, the traction transformer may generate sympathetic inrush, which will cause a malfunction in the transformer differential protection. In order to study the mechanism of the sympathetic inrush of the cascaded traction transformer, the flux–current model of the transformer, line impedance, power system voltage source, and other loads was established. On the basis of the flux–current circuit model, the influence of different factors on the sympathetic inrush of the traction transformer was analyzed. The analysis results were verified by simulation. Research results show that the remanence, closing angle, line impedance, and load will affect the duration and amplitude of the sympathetic inrush.

Keywords: traction network; sympathetic inrush; cascaded transformer; transformer saturation; flux–current circuit model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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