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← TechnologyWhich outcome occurs when protective relay within large electrical power systems detects a sustained overcurrent condition?
A)Transformer core saturation and overheating
B)Selective tripping of upstream circuit breakers✓
C)Synchronization instability across interconnected grids
D)Localized voltage sag propagating system-wide
💡 Explanation
When an overcurrent is detected, the protective relay initiates fault isolation through selective tripping of circuit breakers, because it's designed to disconnect only the affected section while maintaining power to other areas. Therefore, tripping of breakers result, rather than transformer saturation or voltage sag which can come from different imbalances.
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