When pulsating currents are connected to a three-phase four-wire system, triplen harmonic frequencies disrupt the normal phasor relationship of the phase currents and can cause the phase currents to add in the neutral conductor.

Question

When pulsating currents are connected to a three-phase four-wire system, triplen harmonic frequencies disrupt the normal phasor relationship of the phase currents and can cause the phase currents to add in the neutral conductor.

Quizplus · Accepted Answer

Triplen harmonics (3rd, 9th, 15th, etc.) in a three-phase system are in-phase in all three phases. When these harmonics are present, they do not cancel out in the neutral as the fundamental frequencies do, but instead, they add up, potentially causing overheating and other issues in the neutral conductor.

When Pulsating Currents Are Connected to a Three-Phase Four-Wire System, Triplen Harmonic