ANS:
Three-phase electric power is a common
method of alternating-current electric power generation, transmission,
and distribution.It is a type of polyphase system and is the most common
method used by electrical grids
worldwide to transfer power. It is also used to power large motors and
other heavy loads. A three-phase system is usually more economical than
an equivalent single-phase or two-phase system at the same voltage
because it uses less conductor material to transmit electrical power.The
three-phase system was independently invented by Galileo Ferraris,
Mikhail Dolivo-Dobrovolsky and Nikola Tesla in the late 1880s.
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