Star connection is preferred in such cases as it allos the use of neutal conductor as an return path and complete the circuit for a large number of single-phase loads are to be served from a 3-phase transformer bank
Each set of primary and secondary windings of a three-phase transformer is coiled around one leg of an iron core assembly. In essence, it resembles three single-phase transformers connected at the core. These pairs of main and secondary windings will be combined into a single unit using either Y or connections. The emphasis of this section will be on the different permutations of ways that these windings can be joined to one another.
The winding connection choices are the same whether the winding sets share a common core assembly or whether each winding pair is a separate transformer.
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