THE IMPACT OF MAGNETICALLY NONLINEAR IRON CORE CHARACTERISTICS ON RESPONSES OF A THREE-PHASE POWER TRANSFORMER DYNAMIC MODEL

摘要

This work analyses the impact of magnetically nonlinear iron core characteristics on responses calculated by a three-phase power transformer dynamic model. The iron core characteristics are determined in different way. Their impact on calculated responses is evaluated by the comparison of calculated responses with the measured ones. Results presented in the paper show that a very good agreement between the measured results and the calculated ones can be achieved only if the complete harmonic content of measured currents is used for determining magnetically nonlinear iron core characteristics of the transformer.