TRANSIENT REGIMES OF ENERGIZATION, SHORT-CIRCUIT AND LOADING OF THREE-WINDING TRANSFORMERS WITH SPLIT WINDINGS

Abstract

This paper presents the theoretical founda­tions of three-winding transformers with split windings and gives examples from literature and practice. Three transient processes with increased currents were conside­red - switching on, shock short circuit and loading. When switching on, an analysis of the switching on of individual transformers and transformers in parallel operation was carried out with the application of specialized PSCAD software. Calculations of reactance and short-circuit forces performed using the finite element method. The IEC 60076-7 standard [7] was used for the analysis and calculation of loading. For all transition processes, appropriate software tools have been developed in MS EXCEL that include VBA code.