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Within a three-phase power distribution network, which outcome occurs when an insulator fails in a substation's transformer, leading to increased leakage current?

A)Cascading voltage collapse initiates system-wide
B)Increased VAR compensation from neighboring units
C)Harmonic distortion increases locally near failure
D)Improved power factor from reduced impedance

💡 Explanation

Cascading voltage collapse initiates system-wide because the increased leakage current triggers protection relays, isolating the transformer but also overloading adjacent units; therefore voltage drops, initiating a widespread collapse rather than improved power factor because impedance imbalances worsen.

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