What are the limitations of star-delta and DOL starters?

Question

Accepted Answer

The limitations of star delta and DOL starters

Star delta starters are not suitable for high starting torque applications
DOL starters can cause high inrush current during motor starting
Both starters require manual switching between star and delta configurations
Star delta starters are not suitable for motors with high starting current
DOL starters do not provide smooth acceleration and can cause mechanical stress on the motor

Accepted Answer

) Star-Delta starters are widely used due to their relatively low price.

b ) There are no limits to the number of times they can be operated.

c ) The components require very little space.

d ) The starting current is reduced to approximately one-third.

DISADVANTAGES OF STAR DELTA STARTER:

a ) The starter can only be applied to motors where the six leads or terminals can be accessed.

b ) The supply voltage must be the same as the rated motor voltage for Delta connection.

c ) Because the starting current is reduced to approximately one-third of the rated current, the starting torque is also reduced to one-third.Advantages & Disadvantages

The Direct Online starter is an inexpensive starter.

It gives almost complete starting torque at the beginning.

The designing, operating and controlling this starter is very easy.

Understanding and troubleshooting are very easy.

The disadvantages of this starter include the following.

Starting current is very high

This starter causes an important dip in voltage, therefore appropriate only for small motors.

The lifespan of the machine can be reduced.

It is hard mechanically.

Needless high opening torque

What are the limitations of star-delta and DOL starters?

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