(b) Figure 2 illustrates the one-line diagram of a power system. The ratings of the various components in the system are given as follows: Gl: 200 MVA, 48 kV, R= 5 %, X= 85 % G2: 300 MVA, 48 kV, R= 10 %, X= 85 % T1: 100 MVA, 48/440 kV, R = 2 %, X= 10 % T2: 80 MVA, 480/28.8 kV, R = 2%, X= 10 % M: 75 MVA, 24 kV, R= 15 %, X= 95 % The transmission line has an impedance of (25 + j50) N, and the static load impedance is (2.25 + j2.63) N. Consider a base apparent power of 200 MVA and a base voltage of 48 kV at the generator side. (i) Determine the base voltages and impedances in Regions 1, 2 and 3. (ii) Draw the impedance diagram of this power system, and label all the impedances in per-unit (p.u.). Region 1 Region 2 Region 3 (G1 (M1) T1 T2 Transmission line (G2) Static load Figure 2

Introductory Circuit Analysis (13th Edition)
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Author:Robert L. Boylestad
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(b) Figure 2 illustrates the one-line diagram of a power system. The ratings of the
various components in the system are given as follows:
Gl: 200 MVA, 48 kV, R = 5 %, X= 85 %
G2: 300 MVA, 48 kV, R = 10 %, X= 85 %
T1: 100 MVA, 48/440 kV, R = 2 %, X= 10 %
T2: 80 MVA, 480/28.8 kV, R = 2 %, X= 10 %
M: 75 MVA, 24 kV, R = 15 %, X= 95 %
The transmission line has an impedance of (25 + j50) N, and the static load
impedance is (2.25 + j2.63) Q. Consider a base apparent power of 200 MVA
and a base voltage of 48 kV at the generator side.
(i) Determine the base voltages and impedances in Regions 1, 2 and 3.
(ii) Draw the impedance diagram of this power system, and label all the
impedances in per-unit (p.u.).
Region 1
Region 2
Region 3
(G1)
(M1
T1
T2
Transmission line
3E
(G2
Static load
Figure 2
Transcribed Image Text:(b) Figure 2 illustrates the one-line diagram of a power system. The ratings of the various components in the system are given as follows: Gl: 200 MVA, 48 kV, R = 5 %, X= 85 % G2: 300 MVA, 48 kV, R = 10 %, X= 85 % T1: 100 MVA, 48/440 kV, R = 2 %, X= 10 % T2: 80 MVA, 480/28.8 kV, R = 2 %, X= 10 % M: 75 MVA, 24 kV, R = 15 %, X= 95 % The transmission line has an impedance of (25 + j50) N, and the static load impedance is (2.25 + j2.63) Q. Consider a base apparent power of 200 MVA and a base voltage of 48 kV at the generator side. (i) Determine the base voltages and impedances in Regions 1, 2 and 3. (ii) Draw the impedance diagram of this power system, and label all the impedances in per-unit (p.u.). Region 1 Region 2 Region 3 (G1) (M1 T1 T2 Transmission line 3E (G2 Static load Figure 2
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