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← TechnologyWhich outcome happens when a three-phase circuit breaker trips due to a sustained overcurrent fault?
A)System-wide voltage sag on other phases
B)Phase imbalance increases motor vibration✓
C)Transformer core saturation intensifies
D)Harmonic distortion introduced by rectification
💡 Explanation
When a breaker trips on one phase during a sustained fault, phase imbalance occurs because the load is no longer evenly distributed across the three phases, increasing mechanical stress. Therefore, increased motor vibration results, rather than voltage sag, transformer saturation, or harmonic distortion, which arise under balanced overload conditions.
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