A Star-Delta starter is a type of electrical starter used for starting three-phase induction motors. It's a common starting method for motors that require a high starting torque.

Here's how it works:

*Star Connection (Starting):*

1. The motor windings are connected in a Star (Wye) configuration.
2. The voltage across each phase is reduced to 1/√3 (approximately 58%) of the line voltage.
3. The starting current is reduced to 1/3 of the direct online starting current.

*Delta Connection (Running):*

1. Once the motor reaches a certain speed (usually around 80% of the rated speed), the windings are switched to a Delta (Triangle) configuration.
2. The voltage across each phase increases to the full line voltage.
3. The motor operates at its rated voltage and torque.

The Star-Delta starter provides several benefits:

- Reduced starting current
- Lower starting torque
- Improved motor protection
- Smaller starting equipment

This starter is widely used in industrial applications, such as:

- Pump control
- Fan control
- Conveyor systems
- HVAC systems

The Star-Delta starter is a simple and cost-effective solution for starting high-torque motors, making it a popular choice in many industries.

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