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← TechnologyWhich risk increases when a three-phase power transformer has a single-phase overcurrent condition inadequately handled by arc flash protection?
A)System-wide voltage instability occurs
B)Thermal runaway initiates locally
C)Transformer core saturation increases
D)Dielectric breakdown propagates extensively✓
💡 Explanation
Dielectric breakdown can spread rapidly because inadequate arc flash protection inhibits current interruption, and electrical stress escalates at insulation defects leading to cascading failure, therefore accelerating breakdown rather than containment.
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