Question
a) Discuss the following terms as applied to transmission lines:
i) Voltage regulation.
ii) Transmission efficiency.
iii) Transposition.
b) Show how regulation and efficiency are determined for medium lines using end-condenser method.
Illustrate your answer with suitable vector diagram.
c) A 3 phase, 60Hz 16 Km long overhead line supplies 1000 kW at 11kV, 0.8 p.f. lagging. The line resistance is 0.03 S2 per phase per Km and line inductance is 0.7 mH per phase per Km.
Calculate:
i) Sending end voltage
ii) Voltage regulation.
iii) Efficiency of transmission