hallo A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase series impedance of 0.125 + j0.4375 ohm per km. Determine the sending end voltage, voltage regulation, the sending end power, and the transmission efficiency when the line delivers 70 MVA, 0.8 lagging power factor at 64 kV. 120 MW, unity power factor at 64 kV. Use lineperf program to verify your results.

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A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase series impedance of 0.125 + j0.4375 ohm per km. Determine the sending end voltage, voltage regulation, the sending end power, and the transmission efficiency when the line delivers 70 MVA, 0.8 lagging power factor at 64 kV. 120 MW, unity power factor at 64 kV. Use lineperf program to verify your results. 

 

(Q.3) The following figure shows the single-line diagram of a three-bus power system.
Additionally, a second line with an admittance of -j20 pu is connected between the bus 2 and 3.
Now, a three-phase fault occurs at bus 3. Determine the fault current and post-fault voltages of
all buses in pu. Assume the pre-fault bus voltages to be 1.0 pu.
V, =1.020° pu
- P2400MW
Y12 =-j50
Bus 1
Bus 2
V:| =1.03
Slack
Yi3 =-j25
Y23 = -j25
Bus 3
500MW 350MVAR
(Q.4) For the following network, calculate the fault currents (IF1, IF2, IF3 and IF4) in pu and in
kA, and circuit breaker ratings (i.e. fault MVA ) at the indicated locations. Internal reactance of
generators are j0.9 pu. Base quantities: 11 kV, 400 MVA on the generator side.
11/3.3 kV
4 MVA, 7°%
В
j0.5 2
jo.4 2
300 A
200 A
11 kV
250 MVA
Transcribed Image Text:(Q.3) The following figure shows the single-line diagram of a three-bus power system. Additionally, a second line with an admittance of -j20 pu is connected between the bus 2 and 3. Now, a three-phase fault occurs at bus 3. Determine the fault current and post-fault voltages of all buses in pu. Assume the pre-fault bus voltages to be 1.0 pu. V, =1.020° pu - P2400MW Y12 =-j50 Bus 1 Bus 2 V:| =1.03 Slack Yi3 =-j25 Y23 = -j25 Bus 3 500MW 350MVAR (Q.4) For the following network, calculate the fault currents (IF1, IF2, IF3 and IF4) in pu and in kA, and circuit breaker ratings (i.e. fault MVA ) at the indicated locations. Internal reactance of generators are j0.9 pu. Base quantities: 11 kV, 400 MVA on the generator side. 11/3.3 kV 4 MVA, 7°% В j0.5 2 jo.4 2 300 A 200 A 11 kV 250 MVA
(Q.1) The single-line diagram and three phase ratings of an electric power system are shown
below.
Gl: 90 MVA, 20kV, X=9%; T1: 80 MVA, 20/200 kV, X=16%; T2: 80 MVA, 200/20 kV,
X=20%; G2: 90 MVA, 18 kV X=9%; Line: 200 kV, X=120 Q; Load: 200 kV, S=P MW+jQ
MVAR.
T
T
Line
G1
G2
Load
(i) Draw an impedance diagram of the power showing all impedances in per unit (pu) on a 100
MVA base. Choose 20 kV as the voltage base for generator G1.
(ii) The pu load impedance with respect to the above base is (0.75+jl.0). Determine the values of
P and Q.
(Q.2) A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase serie
impedance of (0.125+j0.4375) Q/km. The line delivers 70 MVA, 0.8 lagging pf at 64 kV.
Determine the sending end voltage, voltage regulation, sending end power and transmission
efficiency.
(Q.3) The following figure shows the single-line diagram of a three-bus power system.
Additionally, a second line with an admittance of -j20 pu is connected between the bus 2 and 3.
Now, a three-phase fault occurs at bus 3. Determine the fault current and post-fault voltages of
all buses in pu. Assume the pre-fault bus voltages to be 1.0 pu.
Transcribed Image Text:(Q.1) The single-line diagram and three phase ratings of an electric power system are shown below. Gl: 90 MVA, 20kV, X=9%; T1: 80 MVA, 20/200 kV, X=16%; T2: 80 MVA, 200/20 kV, X=20%; G2: 90 MVA, 18 kV X=9%; Line: 200 kV, X=120 Q; Load: 200 kV, S=P MW+jQ MVAR. T T Line G1 G2 Load (i) Draw an impedance diagram of the power showing all impedances in per unit (pu) on a 100 MVA base. Choose 20 kV as the voltage base for generator G1. (ii) The pu load impedance with respect to the above base is (0.75+jl.0). Determine the values of P and Q. (Q.2) A 69-kV, three-phase short transmission line is 16 km long. The line has a per phase serie impedance of (0.125+j0.4375) Q/km. The line delivers 70 MVA, 0.8 lagging pf at 64 kV. Determine the sending end voltage, voltage regulation, sending end power and transmission efficiency. (Q.3) The following figure shows the single-line diagram of a three-bus power system. Additionally, a second line with an admittance of -j20 pu is connected between the bus 2 and 3. Now, a three-phase fault occurs at bus 3. Determine the fault current and post-fault voltages of all buses in pu. Assume the pre-fault bus voltages to be 1.0 pu.
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