In a symmetric three-phase power supply system, three conductors each carry an alternating current of the same frequency and voltage amplitude relative to a common reference, but with a phase difference of one third of a cycle (i. Three-phase electric power (abbreviated 3ϕ) is the most widely used form of (AC) for , , and. The between a and a are called lines, and the between any two lines is called line voltage. A "delta" (Δ) connected transformer winding is connected between phases of a three-phase system.
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