A Single Area consists of 3 generating units (G1/G2/G3) with the following characteristics: G1: 250 MVA rating, R1 = 0.02 pu (on the 250 MVA base), initial output P1 = 200 MW. G2: 350 MVA rating, R2 = 0.015 pu (on the 350 MVA base), initial output P2 = 300 MW. G3: 300 MVA rating, R3 0.03 pu (on the 300 MVA base), initial output P3 = 150 MW. = The frequency of the system is 60 Hz. Assuming D = 1 pu on a common base of 1000 MVA, what is the new generation output for G3 for a load increase of 75 MW? Select one: O a. 190.55 MW O b. None of these O c. 203.38 MW d. 166.01 MW

7. Two 440V, 60Hz, 6 pole, 30 AC generators are running in parallel. The first supplies the busbars with 525kW of power at a power factor of 0.79 lagging. The second provides the busbars with 415kW at a power factor of 0.96 lagging. An additional load that requires 275kW at a power factor of 0.89 leading is added to the busbars. The two generators have their governor and magnetization controls adjusted so they provide 440V, 60Hz and share the active and reactive powers equally. What is the active and reactive power produced by each and their line currents and speeds?

The maximum demand of a power station is 110 MW. It generates 105 x 10 units during the day. The station has three units of 40 MW and another unit of 40 MW as spare. The running hours of the unit are as follows.  The first unit of 40 MW runs for 24 hours. Another unit of 40 MW runs for 14 hours. A third unit of 40 MW runs for 4 hours. So Find (1) daily load factor (2) plant capacity factor (3) utilization factor and (4) plant use factor.

2. a) Explain the terms load factor and diversity factor. b) Discuss the advantages of interconnected grid system. c) A generating station is to supply four regions of load whose peak loads are 10 MW, 5 MW, 8 MW and 7 MW. The diversity factor at the station is 1-5 and the average annual load factor is 60%. Calculate: (i) the maximum demand on the station, (ii) annual energy supplied by the station and (iii) suggest the installed capacity and the number of units.