1. (a) A short 3 phase 11 kV line delivers a load of 4.1 MW, 2.6 MVAr lag.
If the series impedance of the line is (7.2 + j12.1) /ph, calculate the sending end voltage and load angle
(a) At load, active power = 4.1MW
(b) Develop the receiving end performance chart for the above line and load to a 3-phase power scale. (Use a scale of 10 mm = 1000 V and 30 mm = 4.1 MW.)
4. Using the chart you produced in Question 3, determine:
the real and reactive power when
(i) the transmission angle remains unaltered and the sending end voltage is increased by 28%
(ii) the original sending-end voltage is reduced by 15% and the transmission angle increased by 9°. (Use the same scale as that for Question 3 (b))
(b) the real power limit for the sending voltage in (ii) above (i.e. when reduced by 15%).
