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AC Power Relationships Summary
Figure 10   Three-Phase AC

Electrical Science Volume 3 of 4
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Basic AC Power THREE-PHASE CIRCUITS THREE-PHASE CIRCUITS The design of three-phase AC circuits lends itself to a more efficient method of producing and utilizing an AC voltage. EO 1.5 STATE the reasons that three-phase power systems are used in the industry. EO 1.6 Given values for current, voltage, and power factor in a three-phase system, CALCULATE the following: a. Real power b. Reactive power c. Apparent power EO 1.7 Given  a  diagram  of  a  wye-  or  delta-connected  three- phase system, DESCRIBE the voltage/current relationships of the circuit. EO 1.8 STATE the indications of an unbalanced load in a three- phase power system. Three-Phase Systems A three-phase (3f) system is a combination of three single-phase systems.   In a 3f balanced system, 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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