What is a Transformer Connection?
What is a Transformer Connection?
Three-phase Transformer Connections Definition
A three-phase transformer connects its primary and secondary windings in star or delta configurations for various electrical applications.
Star Connection
In star connection, three windings connect at one end to form a neutral point, used for creating a neutral terminal.
In star connection, a line-to-line current is the same as a line-to-neutral current.
we can find that the line-to-line voltage is √3 times line-to-neutral voltage.
Delta Connection
In delta connection, windings form a closed loop, creating a triangle-like shape, providing a path for the supply to the junction points.
we can find that the line-to-line current is √3 times line-to-neutral current.
line-to-line voltage is the same as line-to-neutral voltage.
Types of Connections
Delta-Delta
The line current is √3 times phase current under balance condition. When magnetizing current is neglected, the current ratios is;
Star-Star
Delta-Star
Star-Delta
Open Delta Connection
This connection operates with two transformers, maintaining three-phase power with a lower load capacity when one transformer is out of service.
