Details

Autor(en) / Beteiligte

• El-Koubysi, A.R.
• Morcos, M.M.
• Heber, A.J.
• Li, J.

Titel

Harmonics in variable speed fan systems

Ist Teil von

• Proceedings of the Twenty-Second Annual North American Power Symposium, 1990, p.68-77

Ort / Verlag

IEEE Comput. Soc. Press

Erscheinungsjahr

1990

Quelle

IEEE Xplore

Beschreibungen/Notizen

• The characteristics of harmonics generated by variable speed fan systems used for ventilation of agricultural buildings are reported. The fan system is controlled with a variable speed, triac-based fan controller and is fitted with a three-bladed, 30 degrees pitch polypropylene propeller. A test is conducted to evaluate voltage and current harmonics produced as a result of the triac's presence in the fan system circuit. The triac introduced harmonics into the current waveform which reduced the motor efficiency. The fan system is not a significant source of voltage harmonics for the utility. Current harmonics are at significant levels with the third current harmonic being the highest at 100% of the fundamental.< >