Which risk increases for hydroelectric power distribution systems experiencing sustained reactive power imbalance?

💡 Explanation

When reactive power imbalance persists in hydroelectric systems, ferroresonance can occur because the inductive reactance of the transformer's windings interacts with the capacitive reactance of the transmission lines, exciting nonlinear resonance. Therefore transformer insulation breakdown results, rather than generator overheating, line sag, or control instability which have different causes.

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