There is a little confusion in literature as to what constitutes aferroresonant circuit. In most, ferroresonance refers to electric circuit conditions where an inductance is oscillating into and out of its magnetic saturation region and where the oscillations involve an interaction with local capacitance. Some also use the term to refer to a system with transformers approaching saturation where there is voltage rise that occurs when X{sub}L and X{sub}c are in series and due to the effective canceling of impedance, current rises and voltages across the elements rise, even though the transformer never enters saturation. The concerns that are most commonly associated with ferroresonance are high peak voltage relative to other phases and relative to ground and abnormal voltage waveforms (magnitude, phase angle, and harmonic content).
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