What is the name of the three-phase electrical system used for most high-power transmission?
Answer
Three-phase power
Three-phase power is the three-phase electrical system used for most high-power transmission.
A three-phase system carries three alternating voltages or currents with the same frequency and amplitude, separated from one another by 120 electrical degrees. This arrangement delivers power more smoothly than a single-phase system and uses conductors efficiently for a given amount of transmitted power.
Three-phase alternating-current systems became closely associated with the work of Nikola Tesla and the development of practical polyphase motors in the late nineteenth century. Power stations commonly generate electricity with three-phase alternators, then transformers raise the voltage for long-distance transmission.
Homes may receive only one phase, depending on the local distribution system, while industrial facilities often receive three-phase service for motors and heavy equipment. Three-phase does not mean three separate frequencies: all three phases have the same frequency, but their waveforms are offset in time.