QI. The figure below shows a one line diagram of a three-phase power network in which a load of 1.5 MV at a lagging power factor of 0.9 is supplied from a 33 kV/11 kV substation via a three-phase overhead line circuit. The impedance of the transmission circuit (0.2+j1.2)Q per phase, as shown. The voltage at the 33kV bus in the substation is maintained at 33.6 kV. Calculate (1) the voltage at the 11 kV load bus, (i) the current in the 11 kV transmission line, and (iii) the power and reactive power flows at the substation 33 kV bus.

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QI.
The figure below shows a one line diagram of a three-phase power network in which a load of 1.5 MV at
a lagging power factor of 0.9 is supplied from a 33 kV/11 kV substation via a three-phase overhead line
circuit. The impedance of the transmission circuit (0.2+j1.2)2 per phase, as shown.
The voltage at the 33kV bus in the substation is maintained at 33.6 kV. Calculate (i) the voltage at the
11 kV load bus, (ii) the current in the 11 kV transmission line, and (iii) the power and reactive power
flows at the substation 33 kV bus.
33AV/1IKV
10 MVA
X0.12 pu
Transmission Line
(021.2)a
Load
S-1.5 MVA
PF-09 lagging
V-33.6 kV
Answers (11.012.L-1.60") kV; (78.632-2744) A 1,353 kW, 703 kVar.
Transcribed Image Text:please show the answer step by step. QI. The figure below shows a one line diagram of a three-phase power network in which a load of 1.5 MV at a lagging power factor of 0.9 is supplied from a 33 kV/11 kV substation via a three-phase overhead line circuit. The impedance of the transmission circuit (0.2+j1.2)2 per phase, as shown. The voltage at the 33kV bus in the substation is maintained at 33.6 kV. Calculate (i) the voltage at the 11 kV load bus, (ii) the current in the 11 kV transmission line, and (iii) the power and reactive power flows at the substation 33 kV bus. 33AV/1IKV 10 MVA X0.12 pu Transmission Line (021.2)a Load S-1.5 MVA PF-09 lagging V-33.6 kV Answers (11.012.L-1.60") kV; (78.632-2744) A 1,353 kW, 703 kVar.
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