7. Draw a per unit reactance diagram for the three-phase system shown in Fig. 8.14. Choose 20 MVA and 66 kV as base values. 10 MVA

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7. Draw a per unit reactance diagram for the three-phase system shown in Fig. 8.14. Choose
20 MVA and 66 kV as base values.
10 MVA
G2 11 kVo o
10 %
Line
10 MVA
G3) 11 kV
10 %
j 60 N
20 MVA
11 kV
15 %
30 MVA
11/66 kV
15 %
30 MVA
66/11 kV
15 %
T3 3E To load
38
omon
2.5 MVA
11/6.6 kV
8 %
AVMR
AVM S
AVM
Fig. 8.14.
8. The one-line diagram for a two-generator system is shown in Fig. 8.15. Redraw the
diagram to show all values in per unit on a 7000 kVA base.
ol las
1 MVA
11 kV
z=j 0.1 pu
T2
Line
G3
z (10 +j 20) 2
0.5 MVA
11 kV
z=j 0.15 pu
2 MVA
11/33 kV
z=j 0.15 pu
3 MVA
33/11 kV
z=j 0.15 pu
2 MVA
11 kV
z=0.05 pu
Flg. 8.15.
Transcribed Image Text:7. Draw a per unit reactance diagram for the three-phase system shown in Fig. 8.14. Choose 20 MVA and 66 kV as base values. 10 MVA G2 11 kVo o 10 % Line 10 MVA G3) 11 kV 10 % j 60 N 20 MVA 11 kV 15 % 30 MVA 11/66 kV 15 % 30 MVA 66/11 kV 15 % T3 3E To load 38 omon 2.5 MVA 11/6.6 kV 8 % AVMR AVM S AVM Fig. 8.14. 8. The one-line diagram for a two-generator system is shown in Fig. 8.15. Redraw the diagram to show all values in per unit on a 7000 kVA base. ol las 1 MVA 11 kV z=j 0.1 pu T2 Line G3 z (10 +j 20) 2 0.5 MVA 11 kV z=j 0.15 pu 2 MVA 11/33 kV z=j 0.15 pu 3 MVA 33/11 kV z=j 0.15 pu 2 MVA 11 kV z=0.05 pu Flg. 8.15.
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