Which risk sharply increases within electrical substation transformers when internal fault current exceeds circuit breaker interrupting capacity?

💡 Explanation

When fault current exceeds breaker capacity, the fault continues unchecked because the breakers cannot interrupt it, leading to rapid overheating. Therefore, a tank rupture and resultant fire is most likely, rather than insulation failure, relay error, or winding hotspots, which require sustained current within equipment tolerances.

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