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Which risk increases when a power distribution transformer's differential protection trips its dedicated circuit breakers during a magnetizing inrush?

A)Unnecessary system-wide voltage sag
B)Increased likelihood of ferroresonance events
C)Localized transformer winding hot-spotting
D)Decreased transformer core saturation margin

💡 Explanation

Increased ferroresonance risk occurs because transformer energization initiates oscillating voltages and currents; the resulting saturation of the core excites nonlinear tank and circuit behaviors. Therefore, ferroresonance becomes more likely, rather than a local heating issue directly in the winding.

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