A Single Area consists of 3 generating units (G1/G2/G3) with the following characteristics: G1: 425 MVA rating, R1 = 0.015 pu (on the 425 MVA base), initial output P1 = 300 MW. G2: 300 MVA rating, R2 = 0.02 pu (on the 300 MVA base), initial output P2 = 200 MW. G3: 300 MVA rating, R3 = 0.03 pu (on the 300 MVA base), initial output P3 = 200 MW. The frequency of the system is 60 Hz. Assuming D = 0 pu and using a common base of 1000 MVA, what is the new steady-state frequency for a load increase of 100 MW? Select one: O a. None of these O b. 59.96 Hz O c. 58.75 Hz O d. 59.88 Hz
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- A Single Area consists of 3 generating units (G1/G2/G3) with the following characteristics: G1: 200 MVA rating, R1 = 0.025 pu (on the 200 MVA base), initial output P1 = 150 MW. G2: 300 MVA rating, R2 = 0.01 pu (on the 300 MVA base), initial output P2 = 200 MW. G3: 400 MVA rating, R3 = 0.02 pu (on the 400 MVA base), initial output P3 = 300 MW. The frequency of the system is 60 Hz. Assuming D 0.75 pu on a common base of 1000 MVA, what is the new generation output for G1 for a load increase of 150 MW? Select one: a. 252.12 MW b. None of these 170.42 MW d. 155.45 MWA Single Area consists of 3 generating units (G1/G2/G3) with the following characteristics: G1: 200 MVA rating, R1 = 0.025 pu (on the 200 MVA base), initial output P1 = 150 MW. G2: 300 MVA rating, R2 = 0.01 pu (on the 300 MVA base), initial output P2 = 200 MW. G3: 400 MVA rating, R3 = 0.02 pu (on the 400 MVA base), initial output P3 = 300 MW. The frequency of the system is 60 Hz. Assuming D = 0.75 pu on a common base of 1000 MVA, what is the new generation output for G1 for a load increase of 150 MW? Select one: O a. None of these O b. 252.12 MW O c. 155.45 MW O d. 170.42 MWIn the system shown in Figure 1, the transformers are connected star-star with both star points grounded and the generators are connected in star with thier star points grounded. The system base is 15 MVA. The transformers all have reactances of 0.04 p.u. on this 15 MVA base. The reactances of all other elements are given in Table 1 (in 2) and the voltage levels are given in Table 2. p.u. G1 p.u. T1 jö Per-Unit Convert all values to p.u. on a 15 MVA base. Xa= p.u. Xc₂= XL = V BABE G1 2 X 9 T3 Figure 1: A section of the distribution system T1 L Table 1: Sequence reactances (2) 3 G1 L G2 0.3 0.59 0.01 4 L 9/10 10 Fault Voltage What is the voltage at bus 3 (in Volts) after the fault has occurred? Vp= V T2 5 T2 34 10/4 Table 2: Voltage bases (kV) G2 4 T3 10/9 | G2 Fault Current A three-phase fault with a fault reactance of 0.01 p.u. occurs at bus 3. Calculate the fault current flowing at the fault point in KA. Ip=-j KA So
- 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. 0.03 pu (on the 300 MVA base), initial output P3 = 150 MW. G3: 300 MVA rating, R3 = 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 MWConsider two interconnected voltage sources connected by a line of impedance Z=jX, as shown in Figure 2.27. (a) Obtain expressions for P12 and Q12. (b) Determine the maximum power transfer and the condition for it toConsider the three single-phase two-winding transformers shown in Figure 3.37. The high-voltage windings are connected in Y. (a) For the low-voltage side, connect the windings in , place the polarity marks, and label the terminals a, b, and c in accordance with the American standard. (b) Relabel the terminals a, b, and c such that VAN is 90 out of phase with Va for positive sequence.
- two generators supplying a load. Generator I has a no-load frequency of 62.5 Hz and a slope Sp1 of I MW/Hz. Generator 2 has a no-load frequency of 62.0 Hz and a slope sp2 of I MW/Hz. The two generators are supplying a real load totaling 2.5 MW at 0.8 PF lagging. (a) At what frequency is this system operating, and how much power is supplied by each of the two generators? (b) Suppose an additional I-MW load were attached to this power system. What would the new system frequency be, and how much power would Gl and G2 supply now? Generator 1 VT V2 Generator 2 VTí KVAR KVARWhat effects are produced by change in voltage? 1. Iron los..........varies approximately as V². 2. Cu loss..........it also varies as V² but decreases with an increase in voltage if constant kVA output is assumed. 3. Efficiency...........for distribution transformers, efficiency at fractional loads decreases with in- crease in voltage while at full load or overload it increases with increase in voltage and vice- versa. 4. Regulation..........it varies as but decreases with increase in voltage if constant kVA output is assumed. 5. Heating.........for constant kVA output, iron temperatures increase whereas Cu temperatures decrease with increase in voltages and vice-versa.A generating station is to supply four regions of load whose peak loads are10 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%. Then the installed capacity is (25 to26)MW. O (24 to25)MW. O (23 to24)MW. O
- Driving-point admittance The actual impedance of a load is 30 OHM. The per-unit impedance of the load is 0.5 pu when Base Voltage is 600 V and Base Power is of O 6000 VA O 8000 VA O2000 VA 4000 VA Jump to ncements MacBook Air DD DII F10 F9 F8 000 F7 F6Q20. The section bus-bars A and B as shown in Figure B5 are linked by a bus-bar reactors each rated at 5000 kVA with 10% reactance. On bus-bar A, there are two generators each of 10,000 kVA with 10% reactance and on B two generators each of 8000 kVA with 12 % reactance. Find the Current and MVA that fed into a dead short circuit between all phases on B with bus-bar reactor in the circuit. Page 4 of 5 جامعة التقنية والعلومر التطبيقية بإبراء University of Technology and Applied Sciences - Ibra Student ID: Section: Student Name: 8,000 kVA 12% 10,000 kVA 10,000 kVA 10% 8,000 kVA 12% 10% 2 3 5,000 kVA 10% lell 8,000 kVA 10% Figure B5 "End of Question Paper"The peak load on a 50 MW power station is 39 MW. It supplies power through for transformers whose connected loads are 17, 12,9 and 10 MW. The maximum demands on these transformers are 15, 10, 8 and 9 MW respectively. The annual load factor is 50% and the plant is operating for 65% of the period in a year. 102. The average load on the station is (A) 50000 kW (C) 39000 kW (B) 19500 kW (D) 48000 kW. 103. The energy supplied per year is (A) 438 x 106 kWh (C) 170.82 x 106 kWh (B) 341.64 x 106 kWh (D) 420.48 x 106 kWh.