The primary windings are connected in star and the secondary windings are connected in delta. Three Single Phase transformer Bankįor example, the figure below shows a Y-D connection of a three-phase transformer. The primary and secondary windings may be connected in star (Y) or delta (D) arrangement. Three similar single-phase transformers can be connected to form a three-phase transformer. In either case, the windings may be connected in four different connection methods.ġ. By constructing a three-phase transformer on a common magnetic structure.By suitably connecting a bank of three single-phase transformers.Two Ways of Three Phase Transformer ConnectionĪ three-phase transformer in an electrical substation can be built in two ways Two Ways of Three Phase Transformer Connection.
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