What is Ferroresonance?

Ferroresonance or Ferroresonant is a term applied to resonant interactions between capacitors and saturable iron-core inductors. During resonance, the inductive reactance increases to match the capacitive reactance and current flow is limited by the system resistance. The phenomenon is used, for example, within ferroresonant transformers of which Constant Voltage Transformers (CVTs) are a configuration.

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What is Ferroresonance?