To make the transformer connections well suited with three-phase supplies, the manufacturer will need to connect them together in a specific way such that it forms a 3 Star Transformer Configuration.A three phase transformer or a 3 phase transformer star connection could be constructed either by connecting together three single-phase transformers, which would then result in the formation of a so-called three phase transformer bank. Or another way could be by using one pre-assembled and balanced star delta 3 phase transformer which consists of three pairs of single phase windings, that are then mounted onto one single, but laminated core.

The advantages of building a single delta star connection of 3 phase transformer is that for the same kVA or Kilo-volt-ampere rating it would be smaller, cheaper and lighter as compared to three individual single phase transformers connected together. This is because the 3 phase delta star transformer calculations also has addition of certain elements such as copper and iron core, which can be used more effectively. The methods of connecting the primary as well as the secondary windings are the same, whether using just a single delta-star 3 phase transformer or three detached Single Phase Transformers.

The primary and secondary windings of a star star connection of 3 phase transformer could be connected in different configuration such that the transformers 3 star cast can practically meet any requirement. For instance, in the case of windings, according to the 3 star transformer manufacturer in himachal Pradesh,  three forms of connection are possible i.e. – star or wye or 3 star transformer specification, delta which is referred to as mesh or 3 phase delta star transformer  as well as interconnected- star which is also known by its zig-zag form.

To learn more about the price of these from 3 star transformer manufacturers in India. The combinations of the three windings could be  interchanged in such a way that these 3 star rating transformer follow either the primary delta-connected and the secondary star-connected, or star-delta, as well as the star-star or delta-delta, depending on the use of the 3 phase transformer star delta connection.

A 3 phase star transformer has three sets of primary and secondary windings. Depending upon how these sets of windings are interconnected, the 3 star transformer manufacturer Mumbai will  determine whether the connection is to be either a star or delta configuration.

• The primary winding is star star (Y) connected with grounded neutral and the secondary winding is delta connected.
• This connection is mainly used in step down transformer at the substation end of the transmission line.
• The ratio of secondary to primary line voltage is 1/√3 times the transformation ratio.
• There is 30° shift between the primary and secondary line voltages.