Question 2 A three phase positive sequence Wye connected generator feeds a balanced 3 phase Wye connected load having an impedance (Zload) 5.2+j6.5 (0/4) as shown in below. The line to line voltage of generator (Vab) is equal to 380Z30° V and the line impedance (Zline) is 0.8+j1.5 (0/4). The generator internal impedance has been neglected and the a-phase of generator as reference. a. Calculate the phase voltages (Van,Vbn,and Vcn) b. Draw single phase equivalent circuit. c. Calculate the line currents (laA,lbB,and IcC)

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Question 2
A three phase positive sequence Wye connected generator feeds a balanced 3 phase Wye
connected load having an impedance (Zload) 5.2+j6.5 (0/4) as shown in below. The line to
line voltage of generator (Vab) is equal to 380230° V and the line impedance (Zline) is
0.8+j1.5 (0/4). The generator internal impedance has been neglected and the a-phase of
generator as reference.
a. Calculate the phase voltages (Van, Vbn,and Vcn)
b. Draw single phase equivalent circuit.
c. Calculate the line currents (laA,lbB,and IcC)
d. Calculate the total real and reactive powers in load and the line.
e. Prove that the absorbed powers equal the supplied power.
la
Zline1
a
A
Zload1
N
n
Zload2
Zload3
IbB
Zline2
Zline3
B.
Transcribed Image Text:Question 2 A three phase positive sequence Wye connected generator feeds a balanced 3 phase Wye connected load having an impedance (Zload) 5.2+j6.5 (0/4) as shown in below. The line to line voltage of generator (Vab) is equal to 380230° V and the line impedance (Zline) is 0.8+j1.5 (0/4). The generator internal impedance has been neglected and the a-phase of generator as reference. a. Calculate the phase voltages (Van, Vbn,and Vcn) b. Draw single phase equivalent circuit. c. Calculate the line currents (laA,lbB,and IcC) d. Calculate the total real and reactive powers in load and the line. e. Prove that the absorbed powers equal the supplied power. la Zline1 a A Zload1 N n Zload2 Zload3 IbB Zline2 Zline3 B.
Question 1
A three-phase, 50 Hz overhead short transmission line has a line-to-line voltage of 11/3 kV
at the receiving end, a total impedance of 3 + j4 0/phase, and a load of 33 MW with a
receiving-end lagging PF of 0.707.
a. Calculate the line-to-neutral voltage at the receiving end.
b. Calculate the line current.
c. Calculate the line-to-neutral at the sending end.
d. Calculate the line-to-line voltages at the sending end.
e. Calculate the load angle.
Transcribed Image Text:Question 1 A three-phase, 50 Hz overhead short transmission line has a line-to-line voltage of 11/3 kV at the receiving end, a total impedance of 3 + j4 0/phase, and a load of 33 MW with a receiving-end lagging PF of 0.707. a. Calculate the line-to-neutral voltage at the receiving end. b. Calculate the line current. c. Calculate the line-to-neutral at the sending end. d. Calculate the line-to-line voltages at the sending end. e. Calculate the load angle.
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