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The commonest source of harmonic current in a modern installation is

  • A.incandescent lighting on a dimmer
  • B.capacitor banks installed for power factor correction
  • C.rectifier front ends in drives and electronic supplies
  • D.induction motors running at rated load

Answer: C

Every switched-mode supply and variable speed drive draws current in pulses rather than sinusoidally, and there are now hundreds of them on a typical site. Capacitors generate no harmonics but may resonate with the supply and amplify those present.

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