According to different classification criteria, three-phase power transformers can be divided into various types. According to structural forms, they can be classified as: oil-immersed type, dry type, gas-insulated type, etc. According to their uses, they can be classified as: power transformers, distribution transformers, autotransformers, rectifier transformers, etc. According to the Брой фази, те могат да бъдат класифицирани като: еднофазни трансформатори, трифазни трансформатори и т.н. .
