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← TechnologyWhich risk increases when insufficient magnetizing impedance exists in a large power transformer causing sympathetic breaker tripping?
A)External winding fault escalation
B)Phase-sequence voltage reversal
C)Overexcitation leading to core saturation✓
D)Cascading system-wide instability
💡 Explanation
Overexcitation risk increases because insufficient impedance increases the magnetizing current leading to **magnetic saturation**. Breaker misoperation happens because harmonic currents from the nonlinear core distort the voltage therefore misinterpreting fault conditions rather than relaying true faults.
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