A 138 kV, 200 MVA, 60 Hz, three-phase, power transmission line is 100 km long, and has the following characteristics:
r = 0.103 W/km
x = 0.525 W/km
y = 3.3 ´ 10-6 S/km
(a) What is per phase series impedance and shunt admittance of this transmission line?
(b) Should it be modeled as a short, medium, or long transmission line?
(c) Calculate the ABCD constants of this transmission line.
(d) Sketch the phasor diagram of this transmission line when the line is supplying rated voltage and apparent power at a 0.90 power factor lagging.
(e) Calculate the sending end voltage if the line is supplying rated voltage and apparent power at 0.90 PF lagging.
(f) What is the voltage regulation of the transmission line for the conditions in (e)?
(g) What is the efficiency of the transmission line for the conditions in (e)?