Auto Transformer Starter Power Wiring Connection Explained @TheElectricalGuy

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Auto transformer starter for 3-phase induction motor

An Auto transformer Starter is suitable for both star and delta connected motors. In this method, the starting current is limited by using a three-phase auto transformer to reduce the initial stator applied voltage. The figure below shows the motor with the Auto transformer starter.
It is provided with a number of tapping. The starter is connected to one particular tapping to obtain the most suitable starting voltage.

The starting current 6 to 8 times the rated current and this can cause voltage dip in supply and also motor and motor-driven equipment experience large torque surge which can damage the motor as well as connected equipment. Three-phase auto transformer is used to reduced high inrush starting current.

Thank You
Arun Gupta
Electricaltechnician02@gmail.com

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