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← TechnologyWhich outcome occurs when a distribution transformer's oil level drops below minimum during peak load conditions?
A)Reduced cooling, causing winding hotspots✓
B)Increased voltage regulation issues upstream
C)Harmonic distortion due to core saturation
D)Unbalanced phase currents in supply lines
💡 Explanation
When oil level drops, reduced convection occurs within the transformer's core and windings because the oil provides the primary cooling mechanism. This localized heating results in winding hotspots which exceed rated temperature. Therefore winding hotspots result, rather than regulation issues, harmonic distortion or unbalanced currents, which involve alternative causes.
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