Behavior of induction motor due to voltage sags and short interruptions

Author

Gomez, Juan C. ; Morcos, Medhat M. ; Reineri, Claudio A. ; Campetelli, Gabriel N.

Author_Institution

Electr. Power Syst. Protection Inst., Rio Cuarto Nat. Univ., Cordoba, Argentina

Volume

17

Issue

2

fYear

2002

fDate

4/1/2002 12:00:00 AM

Firstpage

434

Lastpage

440

Abstract

An experimental study and some calculations on induction motor behavior were carried out. The effects due to short interruptions and voltage sags were investigated. A standard three-phase squirrel-cage motor of 5.5 kW, 1500 r/min, and 380 V was used. The presence of induction motor changes the voltage sag waveform and duration. Protection characteristic curves and contactor ride-through capability together with their improvement are also studied. The interaction between motor load, system hot-load pickup, and voltage sag magnitude determine the motor re-acceleration duration and magnitudes. Besides, on-sag and post-sag currents can reach levels higher than the direct start values. Post-sag overcurrent duration can last more than twice the normal start time period, having specific energies in the same order of magnitude

Keywords

induction motor protection; power supply quality; squirrel cage motors; 380 V; 5.5 kW; 50 Hz; contactor ride-through capability; hot-load pickup; induction motor; on-sag currents; open circuit terminals; post-sag currents; post-sag overcurrent duration; protection characteristic curves; short interruptions; three-phase squirrel-cage motor; voltage sags; Acceleration; Electric shock; Induction motors; Power quality; Power system harmonics; Power system stability; Protection; Torque; Voltage control; Voltage fluctuations;

fLanguage

English

Journal_Title

Power Delivery, IEEE Transactions on

Publisher

ieee

ISSN

0885-8977

Type

jour

DOI

10.1109/61.997914

Filename

997914