Transient analysis on reclosing of three-phase asynchronous motor

Momentary power trip of induction motor is often caused by the temporal fault of power supply system.The main flux of asynchronous motor varies with the power voltage and the para-meter of excited inductance becomes a variable.Therefore,a precise dynamic mathematical model of asynchronous motor,considering of main flux saturation,should be applied in the transient analysis of asynchronous motor due to the momentary voltage dip.A dynamic mathematical model of three-phase asynchronous motor considering the main flux saturation in(d,q)static coordinates system is thus established.An example is given for the computer simulation of the reclosing transient after the momentary power trip of3-phase asynchronous motor caused by the voltage dip and the simu-lation results are analyzed,which may be used as a reference for recloser designers.