3 PHASE INDUCTION MOTOR STAR-DELTA CONNECTION

What is Star Delta Starter?

A star delta starter is the most commonly used method for the starting of a 3 phase induction motor. In star delta starting an induction motor is connected in through a star connection throughout the starting period. Then once the motor reaches the required speed, the motor is connected in through a delta connection
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A: Safety breakers in case of current overflow / fuse

B: Buttons / main contactor
C: Star configuration / star contactor
D: Delta configuration / delta contactor
E: Safety breakers in case of overheat / thermal over load relay




Advantages of Star Delta Starter

The advantages of star delta starters include:
  • Inexpensive
  • No heat is produced, or tap changing device needs to be used, hence efficiency increases.
  • Starting current reduced to 1/3 of direct online starting current.
  • Produce high torque per ampere of line current.
Disadvantages of Star Delta Starter
The disadvantages of star delta starters include:
  • Starting torque is reduced to 1/3 of full load torque.
  • A particular set of motors required.
Star Delta Starter
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