Resumo:
Ferroresonance oscillations involving voltage transformers (VTs) have become a growing phenomenon, especially in wind parks. The search for practical analysis of ferroresonance has motivated the development of a specialized testing system, combining computational simulations and laboratory tests, which explored various aspects related to the occurrence of the phenomenon, highlighting the sensitivity of the system to specific combinations of capacitances. During the tests, the effects of varying the equivalent shunt capacitance and the series capacitance in the circuits were observed, identifying critical values that lead to the occurrence of ferroresonance in each VT studied. The obtained results demonstrated the ability of the testing system to generate and detect the ferroresonance phenomenon under laboratory-simulated conditions, reflecting the real operations of the Power System. The developed EMTP simulation model proved effective in qualitatively predicting possible modes of ferroresonance, provided that the system parameters were known or estimated.
