The three-phase power and line-line ratings of the electric power system shown in Figure 30 are given below. Vg OBH G T2 2 Vm Line M FIGURE 30 One-line diagram for Problem 3.15 G₁: 60 MVA 20 kV X = 9% T₁: 50 MVA 20/200 kV X = 10% T2: 50 MVA 200/20 kV X = 10% M: 43.2 MVA 18 kV X = 8% Line: 200 kV Z 120+j200 $2 (a) Draw an impedance diagram showing all impedances in per unit on a 100-MVA base. Choose 20 kV as the voltage base for generator. (b) The motor is drawing 45 MVA, 0.80 power factor lagging at a line-to-line ter- minal voltage of 18 kV. Determine the terminal voltage and the internal emf of the generator in per unit and in kV.
The three-phase power and line-line ratings of the electric power system shown in Figure 30 are given below. Vg OBH G T2 2 Vm Line M FIGURE 30 One-line diagram for Problem 3.15 G₁: 60 MVA 20 kV X = 9% T₁: 50 MVA 20/200 kV X = 10% T2: 50 MVA 200/20 kV X = 10% M: 43.2 MVA 18 kV X = 8% Line: 200 kV Z 120+j200 $2 (a) Draw an impedance diagram showing all impedances in per unit on a 100-MVA base. Choose 20 kV as the voltage base for generator. (b) The motor is drawing 45 MVA, 0.80 power factor lagging at a line-to-line ter- minal voltage of 18 kV. Determine the terminal voltage and the internal emf of the generator in per unit and in kV.
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Transcribed Image Text:The three-phase power and line-line ratings of the electric power system
shown in Figure 30 are given below.
Vg
OBH
G
T2
2
Vm
Line
M
FIGURE 30
One-line diagram for Problem 3.15
G₁:
60 MVA
20 kV
X = 9%
T₁:
50 MVA
20/200 kV
X = 10%
T2:
50 MVA
200/20 kV
X = 10%
M:
43.2 MVA
18 kV
X = 8%
Line:
200 kV
Z
120+j200 $2
(a) Draw an impedance diagram showing all impedances in per unit on a 100-MVA
base. Choose 20 kV as the voltage base for generator.
(b) The motor is drawing 45 MVA, 0.80 power factor lagging at a line-to-line ter-
minal voltage of 18 kV. Determine the terminal voltage and the internal emf of the
generator in per unit and in kV.
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