Power factor and three-phaseQuestion 1194 of 1506

Which problem can excessive harmonics cause in a three-phase system?

  1. No current at all in the neutral conductor
  2. Very high neutral conductor currents
  3. Higher motor output power
  4. Lower transformer temperature
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Correct answer: Very high neutral conductor currents

Harmonics can overheat transformers and cause exceedingly high neutral currents.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 12.4: Power Quality Measurement

Practice power factor and three-phase

Questions last reviewed: 18 October 2026