Why star delta starter is preferred with induction motor?

Figure: Star Delta Starter of Induction Motor.

Star delta starter is preferred with induction motor due to following reasons:

• Starting current is reduced 3-4 times of the direct current due to which voltage drops and hence it causes less losses.
• Star delta starter circuit comes in circuit first during starting of motor, which reduces voltage 3 times, that is why current also reduces up to 3 times and hence less motor burning is caused.
• The operation of the star-delta method is simple and rugged.
• It is relatively cheap compared to other reduced voltage methods.
• Good Torque/Current Performance.
• The components require very little space.
• The most significant advantage of using Star-Delta starting is the huge reduction in the starting current of the motor, which will result in a significant cost saving on cables, transformers and switch gear. 

comments