Which risk increases when a three-phase power system's delta transformer has one winding fail?

💡 Explanation

When one winding fails in a delta-connected transformer, the remaining two windings must carry the load, causing increased current because the equivalent impedance is reduced, leading to overheating. Therefore, transformer winding overheating results, rather than voltage instability, distortion or tripping, which stem from related, but different faults.

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