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Which risk increases when protective relay logic is incorrectly configured in interconnected power systems?

A)Cascading failures from fault propagation
B)Transformer saturation due to DC bias
C)Generator instability from reactive power swings
D)Line sag from excessive current flow

💡 Explanation

When relay logic is misconfigured, protective devices may fail to isolate faults correctly, and fault currents propagate through the system because of undetected errors. Therefore, cascading failures result, instead of transformer saturation, generator instability, or line sag which each require specific component failures or operating conditions.

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