Determination of network impedance at the place of single-phase load connection

Abstract

The article deals with asymmetry in three phase systems and its relations to single-phase load and short circuit power. A ratio is derived between the coefficient of the voltage asymmetry u, the single-phase load S1f and the three-phase short circuit power. Further is shown an idea to investigate short circuit power from measured values of u and S1f. The results of verification measurement which was carried out in a traction transformer substation of electric railways 25 kV; 50 Hz of the Czech railways are mentioned in the article too.