This question requires you to construct a load diagram. A short 3-phase 11 kV line delivers a load of 4.1 MW, 3.1 MVAr lag. a) If the series impedance of the line is (8.2 + j12.3) 2/ph, calculate the sending end voltage and load angle. 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.) c) Using the same scale as that for part (b) read off the chart to determine the real and reactive power when i) the transmission angle remains unaltered and the sending end voltage is increased by 30% ii) the original sending-end voltage is reduced by 15% and the load angle increased by 7.6°. d) the real power limit for the sending voltage in (ii) above (i.e. when reduced by 15%).