ENEE 205 · Chapter 6
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A 3-phase 132 kV, 50 Hz overhead line delivers 50 MVA and pf 0.8 lagging at its receiving end. The constant of the line are $A = 0.98\angle 3^\circ$ and $B = 110\angle 75^\circ\,\Omega$ phase. Find (i) sending end voltage and power angle (ii) sending end active and reactive power (iii) line losses.
A 3-phase, 50 Hz 100 km long overhead line has the following line constants: resistance per phase per km = $0.153\ \Omega$, inductance per phase per km = $1.21\ \mathrm{mH}$, Capacitance per phase per km = $0.00958\ \mu\mathrm{F}$. The line supplies a load of 20 MW at 0.9 power factor lagging at a line voltage of 110 kV at the receiving end. Calculate the regulation and efficiency.
Why do transmission line perform as source and sink of reactive power? What are their effects on power system?