ABSTRACT
Three-phase power is used almost exclusively for generation, transmission, and distribution, as well as for all industrial uses. It is also used on aircraft, both commercial and military. The transformer can be made smaller and lighter for the same power handling capability, because the copper and iron are used more effectively. Most high power equipment and industrial complexes will use three-phase power. One of the biggest advantages in using three-phase power distribution has to do with smaller magnetic components handling the same power as single-phase. The odd shape of a three-phase transformer could be troublesome, as well as the keeping of balanced loads to minimize circulating currents. The designer must be concerned with the apparent power handling capability, Pt, of the transformer core and winding. The apparent power, Pt, varies with the type of circuit in which the transformer is used.
