Question: A 1 7 8 km , 4 0 0 kV , 3 - phase transmission line has a positivesequence series impedance = ( 0 .

A 178 km,400 kV,3-phase transmission line has a positivesequence series impedance =(0.04+0.45)/km, and a positive-sequence shut admittance =3.4106 S/km. The line delivers 478 MW at the power factor 0.97(lagging). The receiving-end voltage is 393 kV. Calculate the following: (a) The ABCD parameters. 6 marks (b) The sending-end voltage. 10 marks (c) The percentage voltage regulation.

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