A small manufacturing plant has the following connected loads: Load 1 (L1): lighting/outlet/appliances 4,500 W at 0.85 pf LAG Load 2 (L2): compressor motors/pumps 37,300 W at 0.75 pf LAG Load 3 (L3): heaters 15,000 W at 0.95 pf LAG Vsource 440 VAC (rms) 60 Hz L1 L2 L3 Capacitor Bank for power factor improvement
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Calculate the RMS value of the load current (in amperes) at load L2 (compressor/motor pumps), and calculate the RMS value of the total load current (in amperes) of the plant. What is the lagging power factor of the total load of the plant?
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- 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 MWA 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(5) Primary AC Source Transformer Secondary AC/DC Full-wave Rectifier Capaictor in Non- linear Load Figure 6 Analyse different methods of harmonics mitigation to eliminate the harmonic, which you have identify in above power system circuit. You can use harmonic filters, K or equivalent transformers or oversized neutral method depending upon the harmonic sources.
- A generator operating at 50 Hz delivers 1 p.u. power to an infinite bus through a transmission circuit in which resistance is ignored. A fault takes place reducing the maximum power transferable to 0.5 p.u. Where as before the fault, this power was 2.5 p.u. and after the clearance of the fault, it is 2 p.u. The value of 8 is maxA 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 MW8 = 0 Q1: What does happen if we change two currents? Q2: What does happen if we have a three-phase four poles machine? a Q3: What does happen if we have a two-phase two poles machine? Q4: What does happen if we apply a capacitance in phase b and then use same voltage for both phase. Dr. Ali K....p. . --
- 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: O a. None of these O b. 252.12 MW O c. 155.45 MW O d. 170.42 MWQ2\ Two generators G1 & G2 are rated 15 MVA, 11 kV and 10 MVA, 11 kV respectively. The generators are connected to a transformer as shown in the following figure. Find the sub- transient current in each generator when a three-phase fault occurs on the high voltage side of the transformer. A/Y 15 MVA, 11 kV, X"gl=j0.10 pu G2 15 MVA, 11/66 kV, Xr-j0.06 pu 10 MVA, 11 kV, X"g2-j0.10 puA single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and L=40mH. (a) Determine the power factor of the circuit and state whether it is lagging or leading. (b) Determine the real and reactive power absorbed by the load. (c) Calculate the peak magnetic energy Wint stored in the inductor by using the expression Wint=L(Irms)2 and check whether the reactive power Q=Wint is satisfied. (Note: The instantaneous magnetic energy storage fluctuates between zero and the peak energy. This energy must be sent twice each cycle to the load from the source by means of reactive power flows.)
- Consider 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.Match the following: (i) Hysteresis loss (a) Can be redud by constructing the core with laminated sheets of alloy steel (ii) Eddy current loss (b) Can be reduced by the use of special high grades of alloy stl as core material.Q20. 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"