Which risk increases significantly when three-phase power transformers experience differential protection blindspots?

A)Internal winding fault current escalation✓

B)Increased core saturation harmonics production

C)External fault isolation failure likelihood

D)Decreased breaker thermal withstand capacity

💡 Explanation

An internal winding fault current may escalate because differential protection failure prevents rapid isolation; instead, impedance differential relays won't trip, therefore winding damage intensifies rather than clearing as intended; causing breaker overload.

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Which risk increases significantly when three-phase power transformers experience differential protection blindspots?

💡 Explanation

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