This thesis consists of three sections, of which the first two are theoretical in nature, while the third is practical. The first section presents railway electrification (the reasons for it, its implementation, and the historical development of different power supply systems) as well as the components of fixed installations of electric traction, specifically the 3 kV DC system used in the Republic of Slovenia. The second section provides a detailed description of a newly built traction power substation and its components, with a particular emphasis on the substation's electrical power system. The third section presents results obtained from a MATLAB/Simulink program that enables the calculation of short-circuit and load currents in a 3 kV DC network. Using this simulation model, calculations for several different practical short-circuit scenarios were carried out and analysed. The analysis of practical cases contributes to a better understanding of the behaviour of the electric traction system under fault conditions, as well as the importance of appropriate protection and equipment sizing.
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