Transient Electromagnetic Processes in a Three-Phase Cage Induction Motor due to Sudden Disconnection and Fast Reconnection of Its Electric Power Supply

In this paper, electromagnetic transient processes in a three-phase cage induction motor due to sudden disconnection and subsequent fast reconnection of its electric power supply are analyzed using linear complex differential equations of the representative-space-phasor electromagnetic model of the motor. With this in view, it is assumed that the disconnection of the motor from the electric power supply (before its reconnection to the same power supply by rapid automatic reclosing) has a duration of just a few cyclic time-periods of the three-phase time-harmonic supply voltage system, so that, the motor speed remains unchanged over this very short duration. The electromagnetic transient analysis is corroborated by meaningful case-study numerical results.