Which risk increases when high-impedance resonant LC circuit is unintentionally energized in a substation?

💡 Explanation

When an LC circuit resonates at a frequencies coinciding with the harmonics in the transformers magnetizing current, ferroresonance occurs because the inductor's magnetic flux non-linearly modulates with changes in magnetization, resulting in sudden overvoltages. Therefore ferroresonance is most problematic, rather than current harmonics, capacitor failure or transformer core stresses which could occur via other mechanisms, on very different timescales.

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