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← TechnologyWhich consequence results when circulating currents overheat transformer windings?
A)Increased core lamination separation
B)Formation of hot-spots zones✓
C)Dielectric oil polymerization increases
D)Reduced magnetic flux linkage
💡 Explanation
Hot spots are created because eddy current losses induce localized heating within the windings; hysteresis amplifies the thermal gradient. Therefore winding insulation degrades faster, rather than core damage; dielectric defects are results of arcing from over-voltage.
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