Which outcome occurs when a large industrial three-phase transformer experiences sustained operation near its rated Maximum Continuous Thermal Current (MCTC)?

💡 Explanation

Accelerated insulation degradation occurs because exceeding MCTC causes elevated winding temperatures which significantly accelerate the Arrhenius Reaction Rate for polymeric breakdown within the solid insulation of the transformer. Therefore, operational life decreases rather than extended life because chemical change causes embrittlement.

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