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- b) A power station has the following daily load cycle as Figure Q1(b) below: Time in Hours 6-8 8-12 12-16 16 20 20-24| 24–6 Load in MW 90 40 60 20 20 20 Figure Q1(b): Daily Load Cycle i) Plot the load curve i) Plot the load duration curve i) Determine energy generated per dayFor the system shown in Figure 3.34. draw an impedance diagram in per unit by choosing 100 kVA to be the base kVA and 2400 V as the base voltage for the generators.Q2/ Find Yous for the power system all reactance on a common base. Bus 3 j0.25 j0.10 j0.25 Bus 2 j0.125 Bus 1 j0.40 j0.20 j0.10 Bus 4
- The single-line diagram of a power system in shown in the figure. The reactance data for the power system shown in the figure in per unit on a common base are as follows; T1 T2 3 2 4 G1 G2 Item X1 X2 X0 G1 0.100.100.05 G2 0.100.100.05 T1 0.25 0.25 0.25 T2 0.25 0.25 0.25 Line 1-20.300.300.50 1. Draw the positive, negative and zero sequence networks and obtain the Thevenin equivalent circuits 2. Find the fault current for a single line to neutral (SLG) fault as shown in Bus 1.1- Which of the following statement is TRUE ? a. True power is measured in VA b. All the power drawn by a resistive circuit is converted to useful work c. Apparent power and Reactive power are always equal d. True power cannot be measured using wattmeter 2- Which of the following statement is TRUE ? a. Bulb is considered as inductive load b. Loads such as transformers and motors consume reactive power with current waveform lagging the voltage c. Loads such as transformers and motors consume power with current waveform leading the voltage d. Heating element is example of capacitive loadThe data of the power system shown in the figure: X= 1.2 p.u. X= 0.15 p.u. 20MVA G1, G2, G3: T, Т, Тз: L1, L2, L3, L4: Ls: Draw the reactance diagram marked on it all the reactance's in per-unit. 11 KV 30MVA 11/66 KV 66KV X= 400 66KV X= 202 T1 L (G1 T3 Ls L4 美 T2 G3 G2
- . Frame a priority list for supplying a load up to 1000 Mw in the given power plantsPlant 1 : FI = (7 + 0.003 PI) 103 k-cal/Mw-hr.P1= 500 MWPlant 2 : F2 = (7.5 + 0.002 P2) 103 k-cal/Mw-hrP2 max = 400 MWPlant 3 : F3 = (8 + 0.004 P3) 103 k-caI/Mw-hrP3 max = 200 MWThe fuel costs at the plants are given byCPI = I. I Rs/kcalCP2 = 1.05 Rs/kcalCP3 = 1.2 Rs/kcalProblem 5 For two electrical system shown in Figure 5, use cyclic currents to derive a complete mathematical model for each of the electrical systems. Ri. Rz ca) Cz (6) ERZ RITwo synchronous generators G1 and G2 are connected to a power transformer Trand a transmission line as shown below. The system details are as follows:G1: 80 MVA 11KV X” = 20%G2: 60 MVA 11KV X” = 20%Tr. 100 MVA 11/132KV X” = 12%T.L. Xline = j140 Ωa) Draw the system diagram in per unit on a base power =100 MVA and a basevoltage =11KV at the generators side.b) Calculate the three-phase balanced short circuit current (If ) at busbar 3 inAmpere at the high voltage side and at the low voltage side of the transformer. c) Calculate the fault level (MVA)sc in MVA at the high voltage side and at thelow voltage side of the transformer
- 9. A central station is supplying energy to a community through two substations. Each substation feeds four feeders. The maximum daily recorded demands are: POWER STATION. 12,000 KW Sub-station B.. 9000 kW . 2820 kW 1500 kW 4000 kW 2900 kW Substation A 6000 kW .1700 kW 1800 kW Feeder 1 Feeder 1 Feeder 2. Feeder 3. Feeder 4. Feeder 2. Feeder 3. Feeder 4. 2800 kW 600 kW Calculate the diversity factor between (1) substations (if) feeders on substation A and (ii) feeders on sub- station B. |) 1-25 () 1-15 (il) 1-24]The actual impedance of a load is 10 OHM. The new per-unit impedance of the load is 0.5 pu when Base Voltage is 200 V and Base Power is O 4000 VA O 8000 VA O 6000 VA O 2000 VAA central station is supplying energy to a community through two substations. Each substation feeds four feeders. The maximum daily recorded demands are : POWER STATION. 12,000 KW Substation A . 6000 kW Sub-station B . 9000 kW . 1700 kW Feeder 1. Feeder 2. Feeder 1 2820 kW Feeder 2 . 1800 kW 1500 kW Feeder 3 . . 2800 kW Feeder 3 . 4000 kW Feeder 4. Feeder 4. Calculate the diversity factor between (i) substations (ii) feeders on substation A and (iii) feeders on sub- station B. 600 kW 2900 kW