Question

Q3. The single-line diagram of an unloaded power system is shown below. The lengths of the transmission lines are shown on the diagram. The ratings of the generators, transmission lines, and transformers are given. Choose a base of 100 MVA, 154 kV in the circuit of generator 1 and 2. Draw the per-unit circuit and determine the per-unit impedances. A 380 kV constant T1 B 150 km 150 km C T2 G1 T3 G2 T1 LINES T2, T3 G1,G2 380/160 kV 154/10.8 kV 10.8 kV 175 MVA x = j 0.32 ohm/km 125 MVA 160 MVA x= j0.12 p.u. x =j 0.15pu x=j 0.36pu

          Q3. The single-line diagram of an unloaded power system is shown below. The lengths of the transmission lines are shown on the diagram. The ratings of the generators, transmission lines, and transformers are given. Choose a base of 100 MVA, 154 kV in the circuit of generator 1 and 2. Draw the per-unit circuit and determine the per-unit impedances.

A
380 kV constant
T1
B
150 km
150 km
C
T2
G1
T3
G2

T1
LINES
T2, T3
G1,G2

380/160 kV
154/10.8 kV
10.8 kV
175 MVA
x = j 0.32 ohm/km
125 MVA
160 MVA
x= j0.12 p.u.
x =j 0.15pu
x=j 0.36pu

Q3. The single-line diagram of an unloaded power system is shown below. The lengths of the transmission lines are shown on the diagram. The ratings of the generators, transmission lines, and transformers are given. Choose a base of 100 MVA, 154 kV in the circuit of generator 1 and 2. Draw the per-unit circuit and determine the per-unit impedances.

A
380 kV constant
T1
B
150 km
150 km
C
T2
G1
T3
G2

T1
LINES
T2, T3
G1,G2

380/160 kV
154/10.8 kV
10.8 kV
175 MVA
x = j 0.32 ohm/km
125 MVA
160 MVA
x= j0.12 p.u.
x =j 0.15pu
x=j 0.36pu

Added by Amy M.

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