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Harmonic currents drawn by a rectifier drive from the supply

  • A.are entirely absorbed by the smoothing inductor of the drive
  • B.distort the supply voltage and heat other equipment
  • C.improve the power factor of the installation as a whole
  • D.have no effect on any other equipment connected to the same supply

Answer: B

The distorted current interacts with the supply impedance to distort the voltage, and the harmonics cause extra loss in transformers, cables and capacitors. Line reactors, filters and multi-pulse arrangements are the usual mitigations.

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