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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 tappings. 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 autotransformer is used to reduced high inrush starting current.
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Arun Gupta
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