Power factor and three-phaseQuestion 1065 of 1506

How are harmonics that turn in the opposite direction to the fundamental, such as the 5th, classed?

  1. Positive sequence
  2. Zero sequence
  3. Neutral sequence
  4. Negative sequence
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Correct answer: Negative sequence

The 7th is positive sequence and the triplens are zero sequence.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.8: Harmonic Phase Sequences

Practice power factor and three-phase

Questions last reviewed: 18 October 2026