star connection (Y)

A star connection, also known as a wye connection, in three-phase systems is when one end of each of the three windings is connected to a central point, creating a Y-shaped connection. This configuration allows for a neutral point in the system and enables easier measurement of current.

 

In a star-connected system, the voltage between any line conductor and the neutral point is equal to the phase voltage (Line voltage / √3), and the phase current is equal to the line current.

 

The neutral point in a star connection provides a reference point for the system, enabling the measurement of current at a single point and making it useful for grounding and protection against overcurrent’s. It is also useful for the distribution of power to the load where the neutral point is used as the reference point.

 

Additionally, star connections are generally less resistive than delta connections and are commonly used in lighting and power distribution systems where a neutral point is required.