Basic AC Power THREE-PHASE CIRCUITSTHREE-PHASE CIRCUITSThe design of three-phase AC circuits lends itself to a more efficient method ofproducing and utilizing an AC voltage.EO 1.5 STATE the reasons that three-phase power systems areused in the industry.EO 1.6 Given values for current, voltage, and power factor in athree-phase system, CALCULATE the following:a. Real powerb. Reactive powerc. Apparent powerEO 1.7 Given a diagram of a wye- or delta-connected three-phase system, DESCRIBE the voltage/currentrelationships of the circuit.EO 1.8 STATE the indications of an unbalanced load in a three-phase power system.Three-PhaseSystemsA three-phase (3f) system is a combination of three single-phase systems. In a 3f balancedsystem, power comes from a 3f AC generator that produces three separate and equal voltages,each of which is 120° out of phase with the other voltages (Figure 10).Rev. 0 Page 17 ES-09
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