Describe the construction of starters used to start a three-phase slip

1.	Describe the construction of starters used to start a three-phase slip-ring induction motor.
Answer» Three phase induction motors can be started: 1. Direct Online- direct-on-line: which means that the rated supply is directly applied to the motor. 2. Starting Of Squirrel Cage Motors: Starting in-rush current in squirrel cage motors is controlled by applying reduced voltage to the stator. 3. Auto- Transformers: It is basically a three phase step down transformer with different taps provided that permit the user to start the motor at, say, 50%, 65% or 80% of line voltage. 4. Star-Delta Starter: This method is used in the motors, which are designed to run on delta connected stator. 5. Starting Of Slip-Ring Motors: Slip-ring motors are started with full line voltage, as external resistance can be easily added in the rotor circuit with the help of slip-rings.

Describe the construction of starters used to start a three-phase slip-ring induction motor.

Answer»

Three phase induction motors can be started:

1. Direct Online- direct-on-line: which means that the rated supply is directly applied to the motor.

2. Starting Of Squirrel Cage Motors: Starting in-rush current in squirrel cage motors is controlled by applying reduced voltage to the stator.

3. Auto- Transformers: It is basically a three phase step down transformer with different taps provided that permit the user to start the motor at, say, 50%, 65% or 80% of line voltage.

4. Star-Delta Starter: This method is used in the motors, which are designed to run on delta connected stator.

5. Starting Of Slip-Ring Motors: Slip-ring motors are started with full line voltage, as external resistance can be easily added in the rotor circuit with the help of slip-rings.

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