ADVANTAGES OF STAR DELTA STARTER:
a ) 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.
d ) If the motor does not reach at least 90% of its rated speed at the time of switching from Star to Delta the current peak will be as high as in a D.O.L. start, thus causing harmful effects to the contacts of the contactors and the connection system brings no advantage to the electrical system.