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Abstract
Ferroresonance 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 simulation and experimental studies can provide guidelines for evaluating the anti-ferroresonance methods in distribution networks.