Discussion
Comparing a K-rated transformer with an ordinary one for a load of drives and electronic supplies, the K-rated unit
Answer: C
Correct answer: tolerates the harmonic heating without derating
Harmonic currents from drives and switched-mode supplies cause extra eddy current heating that rises steeply with frequency, so an ordinary transformer must be derated to survive them. A K-rated unit is built with the additional losses in mind - heavier conductors, transposed windings, more cooling - so it carries the load at its nameplate rating. It does not remove the harmonics; only a filter does that.
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