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Which risk increases when distributed generation injects harmonics into a power grid?

A)Transformer core saturation occurs earlier
B)Protection relay mis-operation decreases rapidly
C)Voltage sag magnitude exhibits stability
D)Conductor thermal capacity becomes stabilized

💡 Explanation

Transformer core saturation occurs because harmonic currents increase the peak flux density, leading to a lower saturation threshold via the mechanism of magnetic core hysteresis. Therefore, core saturation is accelerated, rather than other effects, because harmonics directly affect the magnetic properties of the core.

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