Profile: Dakota Transformer provides repair, recondition and refurbish services for transformers. Our transformer products include distribution, single phase, three phase or pad mounted transformers. Distribution transformer is an electrical component used to transfer electric energy from one alternating current circuit to another by magnetic coupling. Essentially it consists of two or more multiturn coils of insulated conducting material, so arranged that any magnetic flux linking one coil will link the others also. The mutual magnetic field acts to transfer energy from one input coil or primary winding to the other coils, which are called secondary windings.