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← TechnologyWhich outcome occurs when a distribution transformer's secondary circuit experiences a sustained harmonic current overload?
A)Localized winding hotspot formation✓
B)Core saturation from increased flux
C)Arc flash due to sudden inrush
D)Reduced insulation resistance via oxidation
💡 Explanation
When a sustained harmonic current overload occurs, increased copper losses from skin effect cause localized winding hotspots due to uneven current distribution and increased I^2R losses. Therefore, localized hotspot formation results, rather than core saturation, arc flash from specific faults, or oxidation alone which require different, longer mechanisms.
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