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A transformer supplying a heavily distorted load must be

  • A.connected in star rather than in delta
  • B.derated, the harmonic currents causing extra loss
  • C.uprated, since the harmonic currents do useful work as well
  • D.operated at a higher voltage than nominal

Answer: B

Eddy current loss rises with the square of the frequency, so a given rms current containing harmonics heats the windings more than a sinusoidal one. The K-factor or factor K rating expresses how much distortion a unit will tolerate.

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