Effects of autotransformer’s stabilizing winding on current-voltage conditions during unsymmetrical faults

Abstract In this paper, model of three-phase autotransformer with stabilizing winding is developed in EMTP for short-circuit studies. Currents and voltages are determined inside transformer windings during unsymmetrical faults in the power system. Influence of delta connected stabilizing winding on current-voltage conditions is analysed. Results obtained by EMTP model are compared with the inductance matrix model of autotransformer developed in Matlab, consisting of winding self-inductances and corresponding mutual inductances between windings.