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This paper deals with the model of three-winding autotransformer for steady state analyses and for different types of step-voltage regulator. The paper is focused on comparison of two types of three winding transformer model and on verification of these models by means of measurement of distributing transformer. The analyzed transformer is installed and operated in the electric power station Stupava. Keywordsmathematical model of three-winding autotransformer, step-voltage regulators

The aim of the paper is the review of analysis and mitigation of ferroresonant oscillations. The application of harmonic balance method and bifurcation theory was used to analyse a ferroresonant circuit. The derived closed-form solution is useful mathematical method to find turning points which define boundaries between safe (normal) and ferroresonant region as a function of system parameters. The influence of load on mitigation of ferroresonant oscillations was verified using Matlab/Simulink.