Harmonic problems in equipment can cause the following symptoms except for ___.

Harmonic problems in equipment can cause the following symptoms except for ___.

• A. Nuisance tripping
• B. Sudden phase reversal
• C. Timing errors
• D. Overheating

Answer: (B)

Harmonics distort voltage and current waveforms, putting extra stress on electrical gear. That distortion can trigger nuisance trips in protective devices, cause timing errors in digital controls that rely on clean waveforms, and lead to overheating in transformers, motors, and conductors due to higher RMS currents and additional losses. Sudden phase reversal, however, isn’t a consequence of harmonic distortion; it typically points to wiring or phase-sequence issues. So the symptom that doesn’t fit harmonic problems is sudden phase reversal.

Harmonics distort voltage and current waveforms, putting extra stress on electrical gear. That distortion can trigger nuisance trips in protective devices, cause timing errors in digital controls that rely on clean waveforms, and lead to overheating in transformers, motors, and conductors due to higher RMS currents and additional losses. Sudden phase reversal, however, isn’t a consequence of harmonic distortion; it typically points to wiring or phase-sequence issues. So the symptom that doesn’t fit harmonic problems is sudden phase reversal.