The Analysis of the Symmetrical Short-Circuit Currents in Backup Power Supply Systems with Low-Power Synchronous Generators

Dominik Mamcarz, Paweł Albrechtowicz, Natalia Radwan-Pragłowska and Bartosz Rozegnał
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Dominik Mamcarz: Institute of Electromechanical Conversion, Cracow University of Technology, Warszawska 24 St., 31-155 Cracow, Poland
Paweł Albrechtowicz: Institute of Electromechanical Conversion, Cracow University of Technology, Warszawska 24 St., 31-155 Cracow, Poland
Natalia Radwan-Pragłowska: Institute of Electromechanical Conversion, Cracow University of Technology, Warszawska 24 St., 31-155 Cracow, Poland
Bartosz Rozegnał: Institute of Electromechanical Conversion, Cracow University of Technology, Warszawska 24 St., 31-155 Cracow, Poland

Energies, 2020, vol. 13, issue 17, 1-14

Abstract: This paper presents an analysis of the short-circuit currents of a synchronous generator with a rated power of 16 kVA. For this purpose, the authors carried out measurements of real short-circuit currents during laboratory tests. Additionally, a simulation model of the generator was developed according to the individual machines data from the catalog and field calculations in ANSYS Maxwell software. Based on the mentioned research, the authors compared waveforms of the symmetrical short-circuit currents. In this paper, the last compared family of short-circuit current waveforms was obtained using analytic calculations. As the presented comparison shows, the assumed method of selecting short-circuit waveforms impacted their values. However, the difference in energy related to short-circuit currents did not influence on the selection of the short-circuit protections, especially at low values of steady-state short-circuit currents and short time constants characteristic for the generators, performing the functions of an alternative power supply. Regardless of the research method, the results presented in the article show that the selection of the short-circuit protections is complicated in case of hybrid electrical systems equipped with low power generators.

Keywords: short-circuit current; synchronous generator; power supply systems (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: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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