2.40 A balanced three-phase 240-V source supplies a balanced three-phase load. If the line current I, is measured to be 15 A and is in phase with the line-to-line voltage, Výc, find the per-phase load impedance if the load is (a) Y-connected, (b) A-connected. BC
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Q: Source: Zan = Zon = Zen = 0.1 + j1.5 Q Ean = 12020° v Eon = 1202 - 120° v Eon = 1202120° v %3D Line:…
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Q: A B N° C-
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Q: I. Z. I,
A: The given circuit is: Here, the circuit is balanced positive sequence. Van=100∠10° VZ=15∠55° Ω
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Q: in As in Example 2.5, a balanced-Y-connected voltage source with Eab = 480/0° volts is applied to a…
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Q: Q.21: For the circuit shown, let Z,-602-30°Q, Z2=24230°0 impedances, and the phase voltage be a…
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Q: In a balanced 3-phase wye-connected system with positive-sequence source, the line-to-line voltages…
A: Consider the formula for the line to line voltage in the three phase circuit. VLL=3VLN
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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) NoA 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.2. A single-phase are distributor AB is fed from end A and has a total impedance of (0.3-0.3) ohm. At the far end, the voltage V-240V and the current is 100A at a p.f. of 0, 8 lagging. At the mid-point M. a current of 100 A is tapped at a p... of 0.6 lagging with reference to the voltage V_{M} at the midi-point. Calculate the supply voltage V Lambda j sending current I_{N} and the phase angle between V_{A} and V_{E}
- 2) The one-line diagram of a three-phase power system is as shown in Figure. Impedance are marked in per-unit on a 100-MVA, 400-kV base. The load at bus 2 is S2=15.93 MW - j33.4 Mvar, and at bus 3 is S3-77 MW + j14 Mvar. It is required to hold the voltage at bus 3 at ...L0 kV. Working in per-unit, determine the voltage at buses 2 and 1. (Please determine the voltage magnitude within the specified limits: 410-450 V. By considering the voltage magnitude value you determined yourself, solve the question.) V₁ j0.5 pu V₂ j0.4 pu S₂ Figure V3 S31. Calculate the line currents for phase a, b and c.2. Calculate the line-to-neutral voltages at the load for phase a, b and c.3. Draw the phasor diagram of the source line-to-neutral voltages and line currents.Q4/For the three-phase power network shown in Figure. the various components are: GI: 100 MVA, 0.30 pu reactance. G2: 60 MVA, 0.18 pu reactance. Transformers (cach): 50 MVA, 0.10 pu reactance. Inductive reactor X: 0.20 pu on a base of 100 MVA. Lines (each): 80 ohms (reactive); neglect resistance. with the network initially unloaded and a line voltage of 110 kV, a symmetrical short circuit occurs at midpoint E of line 2. Calculate the short circuit MVA to be interrupted by the circuit breakers A and B at the ends of the line. T3 38 L1 L2 G2 Bas 12 T4 Bus
- 5.In three-phase transformers, the high voltage star connection is preferred. This is so because in this case A) The voltage on the star windings is lower than if they were in delta and this reduces manufacturing costs. B) The voltage on the star windings is higher than if they were in delta and this reduces manufacturing costs. C) The voltage on the star windings would be the line-to-line voltage of the system since it is a three-phase manufacturing transformer. D) THERE IS NO SOLUTION2.21 The three-phase source line-to-neutral voltages are given by E = 10/0°, Em = 10/+240°, and En = 10/-240 volts. Is the source balanced? (a) Yes (b) No In a balanced 3-phase wye-connected system with positive-sequence source, the line- to-line voltages are v3 times the line-to-neutral voltages and lend by 30. (a) True 2.22 (b) False 2.23 In a balanced system, the phasor sum of line-to-line voltages and the phasor sum of line-to-neutral voltages are always equal to zero. (a) False (b) True 2.24 Consider a three-phase Yconnected source feeding a balanced-Y load. The phasor sum of the line currents as well as the neutral current are always zero. (b) False (a) True 2.25 For a balanced-A load supplied by a balanced positive-sequence source, the line cur- rents into the load are v3 times the A-load currents and lag by 30°. (a) True A balanced A-load can be converted to an equivalent balanced-Y load by dividing the A-load impedance by (a) V3 When working with balanced three-phase circuits,…Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Ztoad 500 236.87° ohm , and the transmission line's impedance is Zine = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.
- Q2) A 13.2-kV single-phase generator supplies power to a load through a transmission line. The load's impedance is Zload = 500 236.87° ohm, and the transmission line's impedance is Zline = 60 253.1° ohm. To reduce transmission line losses to 0.0103 of its losses without using the transformers design and use two transformers T1 between the generator and the transmission line and T2 between the transmission line and the load.In Figure 1, the 3-phase source has a line-to-line voltage of 440 volts. The details of the impedances are the following: Z₁ = 36-j15; Z₂ = 40 + /300; Z₂ = 45+j60 ; Z₂ = 75 + jo ; Z5 = 50+j50; Z6 = 20+ j48 2. Determine the following: (a) Line currents: labi, and I (c) Line currents: lar, Ibr, and ICT; (b) Line currents: Iaz, Ibz, and Iczi (d) PT, QT, ST, and pft for the system; (e) W, and W, readings for 2-wattmeter method at lines a and b. Balanced 3-Phase ab-bc-ca source C Figure 1 →laT -Ibr -KT 1 lal ²3 ↓ Ibi 1 Ici la2 lb2 le2ܝ 150 1²₂ ONDTwo 7970-V:230-V single-phase transformers with impedance with respect to their secondaries of 1.5 + j3 and 2 + j4.5 ohms are connected in parallel to a 7900-V source. Their secondaries are supplying a common load of 30 + j40 ohms. What is the magnitude of the voltage across the load in volts? (2 decimal places)