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← ScienceWhich mechanism initiates arcing within high-voltage transformer oil during overload?
A)Dielectric breakdown from excessively intensified electrical fields✓
B)Increased oil viscosity hinders convection cooling
C)Rapid oxidation creates corrosive carbonyl acids
D)Mechanical vibrations cause winding insulations erosion
💡 Explanation
Arcing begins with dielectric breakdown because an elevated electric field caused by the overload surpasses the oil's insulation strength, initiating a discharge path. Therefore, arcing occurs, rather than the other options that describe aging or gradual degradation.
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