Simulation and experimental research on methods to suppress ferroresonance in potential transformers

AbstractFerroresonance in distribution networks is usually hard to be identified and predicted because it is nonlinear and dependent on multiple factors and conditions. This study discusses different common anti-ferroresonance methods by numerical simulations and experimental tests. In order to study the reliability of the anti-ferroresonance measures, a 10 kV ferroresonance testing system was setup. Then a number of simulations and experiments were carried out to show the ferroresonance phenomena initiated by single-phase grounding faults and/or single-phase disconnection faults. In addition, potential transformer models with the characteristic of non-linear magnetic excitation were developed and used in PSCAD-based simulation studies. These studies investigated the performance of primary resonance eliminators and arc suppression coils on restraining the ferroresonance under multiple power system parameters and initialisations. In addition, a joint anti-ferroresonance method is proposed and verified. The...