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Voltage Sag Effects On A Refinery With Induction Motors Loads, Tarek Ibrahim Elshennawy Dr., Amr Yehia Abou-Ghazala A. Prof., Mahmoud El-Gammal Prof.

Tarek Ibrahim ElShennawy

Process continuity of industrial plants (like a refinery) is subjected to several shutdowns due to voltage sags causing large induction motors (IM) to trip. In this paper, the response of induction motors to voltage sags is investigated through computer simulations using the MATLAB/SIMULINK toolbox. The simulations are verified by actual performance. The basic observed effects of voltage sags on IM are speed loss and current and torque transients associated with both voltage reduction and recovery. Results have also showed that three-phase voltage sags and sags occurring at zero crossing are the most severe events. Transient currents occurring at the instants …