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
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.
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