Mitigating Ferroresonance in HV inductive transformers

Ferroresonant oscillations involving voltage transformers (VTs) may be initiated by transient events such as switching operations or intermittent faults. In the present article the problem of ferroresonance involving HV VTs is demonstrated with a particular stress on inductive voltage transformers. ATP/EMTP simulations based on a realistic VT model demonstrated that stable ferroresonant oscillations characterized by significant overcurrent values may be initiated by opening a circuit beaker. A new approach towards damping the ferroresonance by means of a compact active damping device is shown. Experimental verification of the device performance

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