3 phase transfomer MBT A three-phase transformer is a static electromagnetic device made to transmit energy or send alternating electrical signals between circuits through Faraday's electromagnetic induction phenomenon. Three-phase transformers play an important role in the power transmission system. This equipment is mainly used for industrial purposes to generate, transmit, and distribute electrical energy. Three-phase transformers are used and installed in places that consume an extremely large amount of electricity such as buildings, apartments, hospitals, power stations, etc...