Abstract
At present, the superimposed (delta) measurement protection is used as backup protection in the traction power supply system, mainly using the superimposed current to form the protection criterion, lacking the theoretical analysis basis of delta measurement in the traction power supply system. The parameter correspondence between the autotransformer (AT) traction network and the equivalent network is investigated, and the distribution of fault current is deduced by analyzing the equivalent circuit of all-parallel AT traction network. This paper proves the adaptability of the fault component method for nonlinear components such as electric multiple units, introduces the fault component method to analyze the all-parallel AT traction network, gives fault component equivalent circuit diagrams for all-parallel AT traction networks, derives the delta measurement expressions at each circuit breaker (CB), analyzes the distribution characteristics of delta measurement in traction networks, and gives constraints to unify the phase characteristics of delta measurement for no-load and on-load conditions. The simulation results verify the correctness of the theoretical analysis.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (Grant No. 52177116) and the National Key Research and Development Program of China (No. 2021YFB2601500).
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Li, D., Han, Z. (2023). Delta Measurement Analysis Method Applicable to All-Parallel AT Traction Network of High Speed Railway. In: Dong, X., Yang, Q., Ma, W. (eds) The proceedings of the 10th Frontier Academic Forum of Electrical Engineering (FAFEE2022). FAFEE 2022. Lecture Notes in Electrical Engineering, vol 1054. Springer, Singapore. https://doi.org/10.1007/978-981-99-3408-9_50
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DOI: https://doi.org/10.1007/978-981-99-3408-9_50
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