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The name suggests that the three-phase transformer core has three sets of windings. Comprised of three sets of primary and secondary windings, in a three-phase transformer, each set is woven with one leg of an iron core assembly. The structure presents a look of sharing a joined core within three single-phase transformers.

Generally, Three-phase, also known as a 3-phase or 3φ transformer, is used for all types of commercial as well as industrial purposes, apart from electrical power generation, transmission, and distribution. Comparing the three-phase transformers with single-phase ones, in terms of performance and efficiency, the previous ones possess many electrical advantages.