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Which risk increases when induced current exceeds thermal limits three-phase power autotransformer systems?

A)System voltage regulation improves
B)Ferrite core saturation worsens
C)Eddy current losses decrease
D)Dielectric oil breakdown accelerates

💡 Explanation

Dielectric oil breakdown accelerates in transformers because excessive induced current causes overheating, then a reduced dielectric strength of the oil insulation via Thermal Runaway. Therefore, oil breakdown accelerates, rather than preventing it or impacting unrelated systems directly.

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