A simple power system is shown in this Fig. The generator (480 V, 10 kVA) is connected to an ideal step-up transformer (1:10), a transmission line (R=20 Ohm and X=60 Ohm), step down transformer (20:1) and a load with magnitude Z=10 Ohm and angle =30 degree the base values for this system are chosen to be 480 V and 10 kVA at the generator. Calculate the per-unit impedance of the load. 20Ω j60 N 14 Zine 480 20° V Select one: a. 1736 (45 degree) Ohm O b. 36 (90 degree) Ohm c. 1.736 (30 degree) Ohm O d. None of the above

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A simple power system is shown in this Fig.
The generator (480 V, 10 kVA) is connected
to an ideal step-up transformer (1:10), a
transmission line (R=20 Ohm and X=60
Ohm), step down transformer (20:1) and a
load with magnitude Z=10 Ohm and angle
=30 degree the base values for this system
are chosen to be 480 V and 10 kVA at the
generator. Calculate the per-unit
impedance of the load.
20Ω
j60 N
14
Zine
480 2 0° V
Select one:
a. 1736 (45 degree) Ohm
O b. 36 (90 degree) Ohm
c. 1.736 (30 degree) Ohm
O d. None of the above
Transcribed Image Text:A simple power system is shown in this Fig. The generator (480 V, 10 kVA) is connected to an ideal step-up transformer (1:10), a transmission line (R=20 Ohm and X=60 Ohm), step down transformer (20:1) and a load with magnitude Z=10 Ohm and angle =30 degree the base values for this system are chosen to be 480 V and 10 kVA at the generator. Calculate the per-unit impedance of the load. 20Ω j60 N 14 Zine 480 2 0° V Select one: a. 1736 (45 degree) Ohm O b. 36 (90 degree) Ohm c. 1.736 (30 degree) Ohm O d. None of the above
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