A single-phase line has an impedance of 5 °? and supplies a load of 120A, 3,300V at 0.8 p.f lagging. Draw a vector diagram and use it to calculate the sending-end voltage

a) With respect to phases name six systems that are available for A.C distribution; (6 marks)
b) (i) Why is electrical power normally transmitted at high voltage? (1 marks)
(ii) A single-phase line has an impedance of 5 °? and supplies a load of 120A, 3,300V
at 0.8 p.f lagging. Draw a vector diagram and use it to calculate the sending-end voltage. (3 marks)
c) An overhead, single phase-phase transmission line delivers 1100Kw at 33kV at 0.8 p.f lagging. The total resistance of the line is 10O and a total inductive reactance is 15 O..Determine;
(i) Transmission efficiency
(ii) Sending-end voltage
(iii) Sending-end p.f. (4 marks)

 

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