Abstract
The cause of a methodological error in the calculations of short-circuit currents as exemplified in the power supply of a traction network with two-way supply has been shown. It is to be noted that, in an actual power supply circuit, two adjacent traction substations are connected along the 110 (220)-kV lines by mutual resistance, whereas there is no such connection in the designed arrangement. On the basis of the designed scheme, a new equivalent circuit is formed, in which the resulting traction power circuit remains unchanged. The transformation of the initial circuit has enabled removing the error and calculating the short-circuit voltages in the traction network explicitly. Replacement of a symmetric three-phase external power supply system and a traction transformer with an equivalent single-phase circuit when calculating two-phase short-circuit currents in the traction network is shown to be viable. The validity of replacement of a symmetrical three-phase network for a single-phase one has been proved both by transformation of the three-phase equivalent circuit and by means of the equivalent generator method. It is established that, despite the difference in phase resistances of substations with Y/Δ and Y/Y transformer connection circuits, equations for determination of two-phase short-circuit currents prove to be the same.
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REFERENCES
Kuchma, K.G., Markvardt, G.G., and Pupynin, V.N., Zashchita ot tokov korotkogo zamykaniya v kontaktnoi seti (Protection Against Short-Circuit Currents in the Contact Network), Moscow: Transzheldorizdat, 1960.
Markvardt, K.G., Energosnabzhenie elektricheskikh zheleznykh dorog (Energy Supply of Electrical Railways), Moscow: Transport, 1965.
Kosarev, B.I., Zel’vyanskii, Ya.A., and Sibarov, Yu.G., Elektrobezopasnost’ v sisteme elektrosnabzheniya zheleznykh dorog (Electrical Safety in the Power Supply System of Railways), Moscow: Transport, 1983.
Rukovodyashchie ukazaniya po releinoi zashchite sistem tyagovogo elektrosnabzheniya (Guide for Relay Protection of the Traction Power Supply Systems), Moscow: Transizdat, 2005.
Kosarev, A.B. and Kosarev, B.I., Calculation of the current distribution in the AC traction networks, Vestn. Nauchno-Issled. Inst. Zheleznodorozhn. Transp., 2017, no. 6.
Kosarev, A.B. and Kosarev, B.I., Current distribution in AC traction networks with two-way power supply and resistance of the external power supply system, Elektron. Elektrooborud. Transp., 2018, no. 1.
German, L.A. and Kishkurno, K.V., Comparison of calculation methods of the traction power supply system with different accounting methods of external network parameters, Vestn. Nauchno-Issled. Inst. Zheleznodorozhn. Transp., 2013, no. 1.
Alekseenko, E.A., Bulatov, Yu.N., Zakaryukin, V.P., and Kryukov, A.V., Modelirovanie avariinykh rezhimov v sistemakh elektrosnabzheniya zheleznykh dorog (Modeling of Emergency Modes in the Power Supply Railway Systems), Kryukov, A.V., Ed., Irkutks: Irkutsk. Gos. Univ. Putey Soobshch., 2016.
GOST (State Standard) R 527 19-2007: Short-Circuits in Electrical Installations, Calculation Methods in Alternating Current Electrical Installations with Voltage above 1 kV, Moscow: Standartinform, 2007.
Atabekov, G.I., Teoreticheskie osnovy releinoi zashchity vysokovol’tnykh setei (Theory of Relay Protection of High Voltage Networks), Moscow: Gosenergoizdat, 1957.
Petrov, G.N., Elektricheskie mahsiny (Electrical Machines), Moscow: Energiya, 1974, part 1.
Serebryakov, A.S., Transformatory (Power Transformers), Moscow: Mosk. Energ. Inst., 2013.
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Translated by G. Dedkov
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German, L.A., Serebryakov, A.S., Loskutov, A.B. et al. An Equivalent Scheme for Calculating Short-Circuit Currents in a Traction Power Supply System with Two-Way Power Supply. Russ. Electr. Engin. 91, 274–278 (2020). https://doi.org/10.3103/S1068371220040033
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DOI: https://doi.org/10.3103/S1068371220040033