(1) a) A single-circuit 3-phase, 50 Hz, 400 kV line has a series reactance per phase of 0.327 ohm/km. Neglect line resistance. The line is 400 km long and the receiving- end load is 600 MW at 0.9 p.f. lag. The positive-sequence line capacitance is 7.27nF/km. In the absence of any compensating equipment connected to ends of line, calculate the sending-end voltage. Work with and without considering line capacitance. The base quantities for calculation are 400 kV, 1000 MVA.
(2) The following is the data for a 750 KV line. Calculate the corona loss per Km and the corona loss current. Rate of rainfall ρ =5 mm/hr, K=5.35×10-10, PFW=5 KW/km V=750 KV line to line, H=18 m, S=15 m phase spacing, N= 4 sub conductors each of r=0.017m with bundle spacing B=0.457 m. Use surface voltage gradient on center phase for calculation.
3) A single-circuit 3-phase 50 Hz 400 kV line has a series reactance per phase of 0.327 ohm/km. Neglect
line resistance. The line is 400 km long and the receiving-end load is 600 MW at 0.9 p.f. lag. The positive-sequence
line capacitance is 7.27 nF/km. In the absence of any compensating equipment connected to ends of line, calculate
the sending-end voltage. Work with and without considering line capacitance. The base quantities for calculation are
400 kV, 1000 MVA
