Resumo:
This paper presents an analysis of the ferroresonance problem that occurs in potential transformers in wind farm substations from high frequency transients, which has been increasingly recurrent in the context of the Generation of electricity from renewable energy sources. This work also analyzes the capacitances involving the active part of the transformers, which were obtained from data measured in the field, as well as presenting how such capacitances can prevent these transients from occurring. Furthermore, in this paper, a Frequency response analysis will be presented using a typical model of potential transformer that is installed in a wind farm substation. These potential transformers are connected to voltages that, due to their low load, promote the effect of resonance, since, as is widely known, the worst situation the operation of transformer of inductive potential is When it is in emptiness. In this way, this work will be the starting point of a discussion that based on the displacement of the resonance point from the adjustment of capacitances.
