The illustration below is an example of a 3-phase system. It is a common method of AC power generation, transmission, and distribution. Its component values involve Van, Vbn, and Vcn, which are the phase voltages, Vl which is the line voltage, Zl which is the line impedance, Z which is the load impedance, and Ia, Ib, and Ic which is the phase currents. The 3 phases carry voltages and currents which are 120 degrees out of phase with each other. This illustration represents Y-Y connection, other samples are delta-Y, Y-delta, and delta-delta.
From a 3-phase system, we could create a single phase system. But a 3-phase system is more economical than a single-phase or two-phase system because it uses less conductor material (wire) to transmit electric power, at the same voltage. Written below are the common formulas for obtaining the unknown value in a 3-phase system, you could also use the other formulas introduced on the previous posts:
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