![]() ![]() Because it is an AC system, it allows the voltages to be easily stepped-up using transformers to high voltage for transmission and back down for distribution, giving high efficiency.Ī three-wire three-phase circuit is usually more economical than an equivalent two-wire single-phase circuit at the same line to ground voltage because it uses less conductor material to transmit a given amount of electrical power. In three-phase power, the voltage on each wire is 120 degrees phase shifted relative to each of the other wires. Three-phase electrical power was developed in the 1880s by several people. It is a type of polyphase system employing three wires (or four including an optional neutral return wire) and is the most common method used by electrical grids worldwide to transfer power. ![]() Three-phase electric power (abbreviated 3φ ) is a common type of alternating current (AC) used in electricity generation, transmission, and distribution. Three-phase transformer with four wire output for 208Y/120 volt service: one wire for neutral, others for A, B and C phases
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