Equivalent Scheme for Calculating Short-Circuit Current in an Alternating-Current Electric Traction Network

• Published in: Russian electrical engineering Vol. 90; no. 7; pp. 516 - 521
• Main Authors: German, L. A., Serebryakov, A. S., Osokin, V. L., Subkhanverdiev, K. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.07.2019; Springer Nature B.V
• Subjects: Circuits; Engineering; Equivalent circuits; Machines; Manufacturing; Mathematical analysis; Power supplies; Processes; Short circuit currents; Substations; Traction; Transmission lines; short circuit; equivalent circuit; electric traction network; alternating current; transformer winding connection configuration; external power-supply arrangement; error
• DOI: 10.3103/S1068371219070058
• ISSN: 1068-3712

The authors have proved the feasibility of substitution of a three-phase power-supply system with a single-phase one when calculating three-phase circuits in electric traction network irrespectively of the external power supply arrangement. In addition, calculation features have been established for particular transformer winding connection configurations (Y/Y or Y/Δ). Based on results of an analysis performed for minimizing the methodological error in calculating the short-circuit currents, a single-phase equivalent circuit has been developed for the intersubstation zone of the traction network, which takes into account the connection between two adjacent substations via an overhead transmission line of 110 (220) kV. An example of calculation in accordance with the proposed replacement scheme is given.