This lesson covers the concepts of reactor and auto transformer starting in three-phase induction motors. It explains how the starting current and torque are reduced by a factor of X and X square respectively in reactor starting, compared to direct on-line start. The lesson then moves on to discuss auto transformer starting, where the starting current is reduced by a factor of X square, providing some relief. The lesson also introduces the star-delta method of starting, which can only be applied if the motor is designed for delta connected stator winding. The lesson concludes by explaining how to implement star-delta starting in a laboratory setting.

- Reactor starting reduces the starting current by a factor of X and starting torque by a factor of X square.
- Auto transformer starting reduces the starting current by a factor of X square, providing some relief.
- The star-delta method of starting can only be applied if the motor is designed for delta connected stator winding.
- Star-delta starting can be easily implemented in a laboratory setting, provided all six terminals of the motor are available.

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