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← TechnologyWhich outcome occurs when a transformer's impedance is mismatched in a parallel substation?
A)Circulating current becomes unbalanced✓
B)Thermal runaway is immediately avoided
C)Frequency deviation is directly minimized
D)Voltage regulation improves substantially
💡 Explanation
Unbalanced circulating current arises between transformers due to unequal impedance sharing because the **current division principle** dictates that current distributes inversely proportionally to impedance. Therefore, one transformer overloads rather than distributing the load evenly, and other transformers may be underutilized.
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