Page 112 - Electrician - TT (Volume 2)
P. 112
ELECTRICIAN - CITS
Fig 3 shows the connection of an auto-transformer starter. To start the motor the handle of the starter is turned
downward and the motor gets a reduced voltage from the auto-transformer tappings. When the motor attains
about 75% of its rated speed the starter handle is moved upward and the motor gets full voltage. The auto-
transformer gets disconnected from the motor circuit.
Hand operated auto-transformer starters are suitable for motors from 20 to 150 hp whereas automatic auto-
transformer starters are used with large horse-power motors upto 425 hp.
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CITS : Power - Electrician & Wireman - Lesson 70-75 CITS : Power - Electrician & Wireman - Lesson 70-75
