Induction motor behavior due to symmetrical and un-symmetrical faults
Date
2012-06-18Author
Ismail, Daut, Prof. Dr.
Surya Hardi, Amrin
Tunku Muhammad Nizar, Tunku Mansur
Syafruddin, Hasan
Indra, Nisja
Mohd Hafizi, Idris
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This paper presents induction motor behavior caused by symmetrical and unsymmetrical
faults. PSCAD/EMTD power system simulation was used for a simple model and the investigation
purpose. Voltage sags are generally caused by faults on transmission and distribution systems. The
voltage produced may be either symmetrical or unsymmetrical, depend on type of the faults.
Symmetrical fault is faults due to three-phase short circuit and causes balanced sag. Unsymmetrical
fault is faults caused by single-line to ground, phase to phase and two-phase faults and result in
unbalanced sags.
When the voltage sags occur at terminal of an induction motor, the consequences are speed loss,
current and torque peaks may appear at beginning of the fault and voltage recovery instants.
Symmetrical fault result in more severe voltage sag than unsymmetrical fault. These are indicated
in the large current peak, speed sharply drop, toque drops is deeper. Generally transient current
and transient torque appear at the beginning and the end of faults instant.
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