THREE-PHASE CIRCUITS
Basic AC Power
2.
IL
3 If
(1.73)(200)
IL
346 amps
3.
PT
3 VLILcosq
(1.73)(440)(346)(0.6)
PT
158.2 kW
4.
QT
3 VLILsinq
(1.73)(440)(346)(0.8)
QT
210.7 kVAR
5.
ST
3 VLIL
(1.73)(440)(346)
ST
263.4 kVA
Example 2: Each phase of a wye-
Figure 15 Three-Phase Wye Generator
connected
3f
AC
generator
supplies a 100 A current at a
phase voltage of 240V and a
power factor of 0.9 lagging, as
shown in Figure 15.
Find: 1. VL
2. PT
3. QT
4. ST
ES-09
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Rev. 0
