Autors: Ushashki, Y., P., Malamov, I. D., Hadzhiev, I. S.
Title: Analytical determination of short-circuit currents of a 400 kV step-down substation
Keywords: short-circuit current, substation

Abstract: This paper presents the results of a study of short-circuit currents in a 400/121/31,5/0,4 kV substation. Using the impedance method and the short-circuit power method, three-phase and two-phase short-circuit currents were determined at the main points of the substation scheme. The analysis of the obtained data shows a practical coincidence of the results achieved by the two methods.

References

  1. Papkov, B., Vukolov, V. Electric Power Systems and networks. Short-circuit currents, 3rd Edition, Moscow: Yurait Publishing House LLC, 2017. (in Russian)
  2. Medium/Low voltage transformer substations: theory and examples of shortcircuit current calculations and selection of circuit breakers, Designer’s Series, ABB. (in Russian)
  3. Selection of electrical equipment in the design of medium/low voltage transformer substations, Designer’s Series, ABB. (in Russian)
  4. Electrical instаllation handbook: protection and control devices, ABB, Vol. 1, 2, 5th edition.
  5. Metz-Noblat, B., Dumas, F., Poulain, C. Calculation of short-circuit currents, Cahier technique no. 158, Schneider Electric.
  6. Nikolov, D. Electrical power networks and systems, Technika, Sofia, 1994. (in Bulgarian)
  7. Catalogue of cables and wires, Filkab, Online.: http://filkab.com/produkti/kabeli-iprovodnitsi. (in Bulgarian)
  8. IEC 60909: Short-circuit currents in three phase AC systems - Part 0: Calculation of currents; Part 1: Factors for the calculation of short circuit currents; Part 2: Electrical equipment. Data for short circuit current calculations; Part 3: Currents during two separate simultaneous single phase line-toearth short circuits and partial short-circuit currents flowing through earth; Part 4: Examples for the calculation of short circuit currents.
  9. Development plan of Bulgaria’s electricity transmission network for the period 2021– 2030, Electricity System Operator EAD (ESO EAD). Sofia, 2021. (in Bulgarian)

Issue

Youth Forums “Science, Technology, Innovation, Business” 2025, pp. 76-80, 2025, Bulgaria, ISSN 2367-8569

Вид: публикация в национален форум, индексирана в национален референтен списък