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A 3-phase squirrel-cage induction motor is started by means of a star/delta switch. What is the starting current of the motor
  • a)
    3 times the current with direct on line starting
  • b)
    1/3 times the current with direct on line starting
  • c)
    1/ √3 times the current with direct on line starting
  • d)
    √3 times the current with direct on linestarting
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
A 3-phase squirrel-cage induction motor is started by means of a star/...


Explanation:

Star/Delta Starting:
- Star/delta starting is a method used to reduce the starting current of a 3-phase squirrel-cage induction motor.
- In this method, the motor is initially connected in a star configuration for starting and then switched to a delta configuration for running.

Starting Current Comparison:
- When a motor is started using star/delta starting, the starting current is reduced to approximately one-third of the current that would flow if the motor was started directly online.
- This reduction in current helps in preventing voltage drops and excessive heating of the motor during the starting process.

Therefore, the correct answer to the question is:
1/3 times the current with direct on line starting
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