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Which risk increases substantially when harmonics disrupt the autotransformer neutral current?

A)Localized winding thermal overloading
B)Reduced capacitive circuit impedance
C)Increased ferroresonance core losses
D)Decreased dielectric oil viscosity

💡 Explanation

Excessive harmonic current increases `eddy current loss` due to skin effect, therefore localized winding thermal overloading is much more likely, because of restricted flow of these high-frequency components through the conductors, rather than changes elsewhere.

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