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- The three-phase source line-to-neutral voltages are given by Ean=100,Ebh=10+240, and Ecn=10240volts. Is the source balanced? (a) Yes (b) NoIn a balanced system, the phasor sum of the line-to-line voltages and the phasor sum of the line-to-neutral voltages are always equal to zero. (a) False (b) TrueA balanced -connected impedance load with (12+j9) per phase is supplied by a balanced three-phase 60-Hz,208-V source, (a) Calculate the line current, the total real and reactive power absorbed by the load, the load power factor, and the apparent load power, (b) Sketch a phasor diagram showing the line currents, the line-to-line source voltages, and the -load currents. Use Vab as the reference.
- AC Power and Power Factor 1. Two loads are connected in parallel across a 13,200-volt line. Load A draws 200kW at 0.6 p.f. (lagging), load B takes 200kVA at 0.8 p.f. (lagging). Find the reactive, apparent and true power and the line current.Draw a 3-phase wye-connected generator with transmission lines connected to a 3-phase delta-connected load. Assume the lines connecting them have an inductance of j5 per phase. The generated voltages are 120 Vrms with phase 'a' having a phase angle of 0°. The loads are 10 Ohm resistors per phase. When drawing, make sure to label all 3 phases with voltage phasors, line inductances, and load resistances.The one-line diagram of a three-phase power system is shown in the above figure. The line impedances are in per- unit on a 100-MVA base, and the line admittances are neglected. ' qu V = 1.05200 0.01+ j0.025 300 + j200 MVA 3 0.015 + j0.035 150 MW 200 + j150 MVA 0.01 + j0.03 |V = 1.03 The admittance matrix (Y_bus)? The bus power in per-unit?
- The one-line diagram of a three-phase power system is shown in the above figure. The line impedances are in per- unit on a 100-MVA base, and the line admittances are neglected. Use Gauss-Seidel method in Matlab to analyze the system the tolerance of error is 10-3. Then anwser the questions as follows. V, = 1.05200 0.01+ j0.025 300 + j200 MVA 0.015 + j0.035 150 MW 200 +j150 MVA 0.01+ j0.03 |V = 1.03 The admittance matrix (Y_bus)? 0.02 + jo.04 0.0125 + jo.03 2.A balanced Y-connected generator with terminal voltage Vbc 5 200/08 volts is connected to a balanced-D load whose impedance is 10/408 ohms per phase. The line impedance between the source and load is 0.5/808 ohm for each phase. The generator neutral is grounded through an impedance of j5 ohms. The generator sequence impedances are given by Zg0 5 j7, Zg1 5 j15, and Zg2 5 j10 ohms. Draw the sequence networks for this system and determine the sequence components of the line currents.For the given circuit below a. Calculate E, IR, and IL, in phasor form.b. Calculate the total power factor (leading or lagging) and the average power delivered to the circuit.c. Draw the admittance diagram and draw the phasor diagram of the currents Is, IR, and IL, and the voltage E.
- A three-phase alternator generating unbalanced voltages is connected to an unbalanced load through a 3-phase transmission line as shown in figure. The neutral of the alternator and the star point of the load are solidly grounded. The phase voltages of the alternator are Ea = 1020°, Eb = 102-90°, Ec = 10/120⁰ E E E The positive sequence component of the load current is (A) 1.3102-107⁰ A (B) 0.332Z –120° A (C) 0.9962-120° A (D) 3.5104-81⁰ A +) + j1.002 0000 j1.002 0000 j1.0Ω vovo j1.0Ω 0000 j2.002 voor j3.002 ooooThere is an installation with two equal triphasic loads of 300 kVA each and a power factor of 0.9 lagging. When connecting a pure reactive element in parallel, the reactive power at the entrance of the installation is 150 kVARS, with a lagging power factor. We can say that: a) A bank of reactors was connected and the fp deteriorated. b) A capacitor bank was connected and the pf deteriorated. c) A bank of reactors was connected and the fp improved. d) A capacitor bank was connected and the pf improved. e) None of the aboveSuppose you have a three-phase generator that provides 120 Vac per phase and works at a frequency of 60 Hz, this generator can be connected in both delta and star. Also consider the following 6 load impedances, which will be connected at the same time to the generator as follows: ZA, ZB and Zc are connected in star, while Zp, Zg and Zp are connected in delta. j20 j3n Za j20 ZA j30 j3n -j20 j 30 -j20 Zo -j20 ZE j30 -j2n j 3n. ZF Assume the generator is star-connected with neutral, calculate total system power, total power factor, and current in neutral.