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A power quality analyser is used in an audit chiefly to establish

  • A.the harmonic distortion and the resulting losses
  • B.the insulation resistance of the distribution wiring
  • C.the earth resistance of the installation
  • D.the illumination level at the working plane

Answer: A

Harmonic currents circulate without doing useful work, heat the transformer and the neutral, and derate the cables, all of which is invisible on an ordinary meter. Quantifying them is what justifies a filter or a change of drive.

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