Subject Name : economics of generation

(4) A utility is planning to construct a power station to supply a load consuming center 30 Km away from the proposed station location and having the following characteristics: 80 MW, 0.8 p.f. lagging for 10 hours, 30 MW, 0.85 p.f. lagging for 6 hours, and 18 MW, 0.90 p.f. lagging for 8 hours Either of the following supply schemes is available: a-steam station b- hydro station The following station data are given: Item Steam station Hydro station Capital cost (LE/KW) 600 1500 Operation cost (LE/KW) 0.05 0.01 Interest & Depreciation % 12 7 For the purpose of transmitting energy to the load center, it is suggested that either a double circuit O.H.T.L or a double circuit U.G.C is utilized. The following data are given: Transmission voltage: 3-phase, 66KV, 50Hz, Interest & Depreciation = 12% For double circuit O.H.T.L: Cost of double circuit (LE/KM) = 35000+120A, where A is cross-sectional area in mm?. Specific resistance = 17.2 For double circuit U.G.C: Cost of double circuit (LE/KM) = 80000 Conductor resistance /PH/Km = 0.28 Ohm Capacitance /PH/KM = 0.45uF Sheath resistance /PH/KM = 0.042 Ohm Mutual reactance/PH/KM = 0.15 Ohm Power factor of insulation = 0.003 Select the most appropriate supply system. (4) A utility is planning to construct a power station to supply a load consuming center 30 Km away from the proposed station location and having the following characteristics: 80 MW, 0.8 p.f. lagging for 10 hours, 30 MW, 0.85 p.f. lagging for 6 hours, and 18 MW, 0.90 p.f. lagging for 8 hours Either of the following supply schemes is available: a-steam station b- hydro station The following station data are given: Item Steam station Hydro station Capital cost (LE/KW) 600 1500 Operation cost (LE/KW) 0.05 0.01 Interest & Depreciation % 12 7 For the purpose of transmitting energy to the load center, it is suggested that either a double circuit O.H.T.L or a double circuit U.G.C is utilized. The following data are given: Transmission voltage: 3-phase, 66KV, 50Hz, Interest & Depreciation = 12% For double circuit O.H.T.L: Cost of double circuit (LE/KM) = 35000+120A, where A is cross-sectional area in mm?. Specific resistance = 17.2 For double circuit U.G.C: Cost of double circuit (LE/KM) = 80000 Conductor resistance /PH/Km = 0.28 Ohm Capacitance /PH/KM = 0.45uF Sheath resistance /PH/KM = 0.042 Ohm Mutual reactance/PH/KM = 0.15 Ohm Power factor of insulation = 0.003 Select the most appropriate supply system