![]() ![]() Three-phase, also written as 3-phase or 3φ supplies are used for electrical power generation, transmission, and distribution, as well as for all industrial uses. If we take three single-phase transformers and connect their primary windings to each other and their secondary windings to each other in a fixed configuration, we can use the transformers on a three-phase supply. But voltage transformers can also be constructed for connection to not only one single phase, but for two-phases, three-phases, six-phases and even elaborate combinations up to 24-phases for some DC rectification transformers. ![]() ![]() Thus far we have looked at the construction and operation of the single-phase, two winding voltage transformer which can be used increase or decrease its secondary voltage with respect to the primary supply voltage. Three-phase voltages (and currents) are raised or lowered by means of three phase transformers as the three phase transformer can have its windings connected in various ways. ![]() A three-phase electrical system in used to generate and transmit electric power over long distances for use by offices and industry. ![]()
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