Behavioral patterns in voltage transformer for ferroresonance detection

Ferroresonance can severely affect voltage transformers, causing quality and security problems. The possibility of appearing a ferroresonance phenomenon is mainly based on an existing series connected capacitance and a nonlinear inductance. However, factors that may influence on it are not only limited to these considerations, but also to several constructive, design, operation and protective parameters. This paper analyses the process of obtaining the ferroresonant behaviour of a medium voltage (MV) phase-to-phase voltage transformer under different operation conditions. The study is developed by software simulation in order to characterize several ferroresonant behavioral patterns of the voltage transformer. This characterization may be essential for future methodologies to detect and suppress this phenomenon, frequently regarded as an unpredictable or random.