Star delta power wiring diagram.

Question

Accepted Answer

Star delta power wiring diagram is a method used to reduce starting current in induction motors.

Star delta wiring involves connecting the motor windings in a star configuration during starting, then switching to a delta configuration once the motor is up to speed.
This method is commonly used for large induction motors to reduce the starting current and torque on the electrical supply.
The wiring diagram typically includes a main contactor, a star contactor, a delta contactor, and overload relays for protection.
The transition from star to delta configuration is usually controlled by a timer or a motor control circuit.
Properly implementing the star delta wiring diagram can help improve the efficiency and longevity of the motor.
Example: In a 3-phase induction motor, the windings are initially connected in a star configuration for starting, then switched to a delta configuration for running.
Example: The wiring diagram will show the connections between the motor terminals, contactors, and overload relays.

Top Value Chain Solutions Electrical Maintenance Engineer interview questions & answers