QUESTION 4 a) The single-line diagram of a three-phase system is shown in figure below. The manufacturer's nominal ratings are given as in table below. Using the common base S, = 60 MVA, draw the impedance diagram in per unit including the load impedance. Voltage base for buses 1, 2, and 3 is 120kV. Transmission lines 1, 2, and 3 have the reactance of 502, 40 2, and 302, respectively. Bus 0 Bus 2 Component S (VA) v (kV) Line 1 X G2 G1 48 MVA 20 kV 22% G2 30 MVA 15 kV 17% Line 2 Line 3 T1 50 MVA 20/110 kV 9% Bus 3 T2 35 MVA 15/110 kV 5% T3 50 MVA 11/110 KV 12% Bus Load

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QUESTION 4
a) The single-line diagram of a three-phase system is shown in figure below. The manufacturer's nominal ratings are given
as in table below. Using the common base S, = 60 MVA, draw the impedance diagram in per unit including the load
impedance. Voltage base for buses 1, 2, and 3 is 120kV. Transmission lines 1, 2, and 3 have the reactance of 502, 40 2,
and 302, respectively.
Bus 0
Bus 2
Component S (VA)
v (kV)
Line 1
X
G2
G1
48 MVA
20 kV
22%
G2
30 MVA
15 kV
17%
Line 2
Line 3
T1
50 MVA
20/110 kV
9%
Bus 3
T2
35 MVA
15/110 kV
5%
T3
50 MVA
11/110 KV
12%
Bus
Load
Transcribed Image Text:QUESTION 4 a) The single-line diagram of a three-phase system is shown in figure below. The manufacturer's nominal ratings are given as in table below. Using the common base S, = 60 MVA, draw the impedance diagram in per unit including the load impedance. Voltage base for buses 1, 2, and 3 is 120kV. Transmission lines 1, 2, and 3 have the reactance of 502, 40 2, and 302, respectively. Bus 0 Bus 2 Component S (VA) v (kV) Line 1 X G2 G1 48 MVA 20 kV 22% G2 30 MVA 15 kV 17% Line 2 Line 3 T1 50 MVA 20/110 kV 9% Bus 3 T2 35 MVA 15/110 kV 5% T3 50 MVA 11/110 KV 12% Bus Load
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