Three-phase Transformer Circuits Connection

-:Describe the connection of electrical transformer:-

What is Y-Y (STAR-STAR) Connection:-

This types of connection is most economical for small, high -voltage transformers. Because the number of turns/ phase & the amount of insulation required is minium.

Here phase voltage is only 1/root-3 of line voltage.

• Primary Winding Each Phase is 120°electrical degrees out of phase with the other two phases.

Each primary winding is magnetically linked to one secondary winding through a common core leg. Sets of windings that are magnetically linked are drawn parallel to each other in the vector diagram. In the Y-Y connection, each primary and secondary winding is connected to a neutral point. The neutral point may or may not be brought out to an external physical connection and the neutral may or may not be grounded.