Three-phase transformers are used in power generation and distribution. They are also used for industrial purposes. In both settings, they provide benefits that make the operation better, including:
Expense: Three-phase transformers use less expensive wiring, and they may use a single core. Both reduce the upfront cost of the transformer, as compared to three single-phase transformers. They are also less expensive to run.
Size: Three-phase transformers take up less room than three single-phase transformers. You therefore can save on space by using three-phase transformers.
Safety: Three-phase transformers operate at a lower voltage, which makes them safer.
Distance: If you need to transfer power further, a three-phase transformer is a better option.