INVESTIGATION OF STEADY-STATE ASYMMETRIC MODES OF THREE-LEGS TRANSFORMER WITH EXTENDED TRIANGLE CONNECTION

Abstract

The original investigation of steady-state asymmetric modes of 4 winding three-phase three legs conversion transformer with extended delta connection was made. The mathematical model in the MATLAB package was used. It takes into account the electromagnetic coupling of the windings, located on different legs. As initial data rated power and voltages of the windings, pair short circuit voltages, power losses in no-load and shortcircuit modes, no-load current, and similar data for the zero sequence parameters were used. As it was demonstrated the presence of extended delta changes the transformer behavior, so that the magnetic flux didn’t exit from magnetic core into the surrounding space.