QI/ A balanced three-phase system (4-wires), star-connected generator with ABC sequence have an internal voltage of 150 with phase angle 0°. The generator feeds a balanced three- phase a Y-connected load having R= 6 2 & X- j82. Find:- a- Draw the circuit in above, b- Phase angle 02 & 03, c- Phase currents of the load, d- Phase voltages, e- Line voltages, f- Draw the phasor diagram, g- Find (PT,Qr, ST and Fp).
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- "A three phase motor is connected to a balanced three-phase supply. Meters placed in the circuit obtained the folllowing data: 400 V line-line voltage, 9 A line current, and 5 KW total power. Assume delta connection for the equivalent circuit of the load. What is the phase voltage of the motor?" (THIS PROBLEM IS MULTIPLE CHOICE PLEASEE CHOOSE A LETTER BELOW AND PROVIDE YOUR CLEAR SOLUTION!) A 400 V B 692 V C 231 V D 800 V (THIS PROBLEM IS MULTIPLE CHOICE PLEASEE CHOOSE A LETTER BELOW AND PROVIDE YOUR CLEAR SOLUTION!)A 3-phase Y-connected source (400V) supplies a 3-phase Y-connected load (3xZload = 27 + 9.0 ohm) via a non-ideal, three-core cable. No neutral line is available. Each conductor of the cable has an impedance Zcable = 80 + 2.1 mOhm a. Measure the phase shift angle between line voltage and phase voltage. b. Because of a fault, one of the three load impedances changes to half its original value. What happens to the phase voltages at the load.A) A factory has the following load with power factor of 0.9 lagging in each phase. Red phase 40 A, yellow phase 50 A and blue phase 60 A. If the supply is 400 V, three phase, four-wire, calculate the current in the neutral and the total active power. Draw a phasor diagram for phase and line quantities. Assume that, relative to the current in the red phase, the current in the yellow phase lags by 120° and that in the blue phase leads by 120°. B) Explain the advantage of connecting the low-voltage winding of distribution transformers in star.
- A 3-, 400-V symmetrical supply feeds a star-connected load consisting of non-reactive resistors of 3, 4 and 5 connected to the R. Y and 8 lines respectively. The phase sequence is RYB. Calculate (1) the load star point potential (i) current in each resistor and power dissipated in each resistor.This wind farm needs a 250 km connection laid to Sommerville. The choice is either a 3 phase system or a bipolar dc system at 400 kV and ±400 kV at the receiving end respectively. (i) The 3-phase system has resistive losses per phase of 0.1 Ω/km. Calculate the system losses (in watts) when delivering 0.8 GW. (ii) The bipolar dc system has resistive losses of 0.1 Ω/km. Calculate the system losses (in watts) when delivering 0.8 GW. (iii) Calculate the efficiencies of the two systems. (iv) Comment on which system you would choose to use and why.Circuit theory I just want the final answer, I don't need the solution steps. I want the solution in less than 30 minutes, please The question is : Q.1) A Y-connected balanced three-phase generator with an impedance of Zs =0.4+j0.3 ohm per phase is connected to a Y-connected balanced load with an impedance of ZL=19+j48 ohm per phase. The line joining the generator and the load has an impedance of Zl=0.6+j0.7 ohm per phase. Assuming a positive sequence for the source voltages and that amplitude of |Van|=204 and its phase angle 30 degree Find: (a) amplitude of the line voltage Vbc, (b) amplitude of the line current Ic, (c) the complex power at the balanced three-phase load. a. (a) Vb=353.34 V, (b) Ic=3.85 A, (c) S = 89641.40 + j 1110.11 VA b. (a) Vb=288.50 V, (b) Ic=2.23 A, (c) S = 14940.23 + j 320.46 VA c. (a) Vb=353.34 V, (b) Ic=3.85 A, (c) S = 846.88 + j 2139.49 VA d. (a) Vb=353.34 V, (b) Ic=5.78 A, (c) S = 44820.70 + j 832.58 VA e. (a) Vb=353.34 V, (b)…
- Problem 2The following two three-phase loads are connected to a three-phase system of 311.13 cos (377 t) V line: 1) Three-phase induction motor of 10000 VA in Y with a power factor of 0.62) Three-phase load balanced in Δ with Zf = 20 ∠ 323.13 ° Ω. Please finda) total current in each line,b) the apparent and reactive power andc) the copper losses that occur.Circuit theory I just want the final answer, I don't need the solution steps Q.1) A Y-connected balanced three-phase generator with an impedance of Zs =0.4+j0.3 ohm per phase is connected to a Y-connected balanced load with an impedance of ZL=19+j48 ohm per phase. The line joining the generator and the load has an impedance of Zl=0.6+j0.7 ohm per phase. Assuming a positive sequence for the source voltages and that amplitude of |Van|=204 and its phase angle 30 degree Find: (a) amplitude of the line voltage Vbc, (b) amplitude of the line current Ic, (c) the complex power at the balanced three-phase load. a. (a) Vb=353.34 V, (b) Ic=3.85 A, (c) S = 89641.40 + j 1110.11 VA b. (a) Vb=288.50 V, (b) Ic=2.23 A, (c) S = 14940.23 + j 320.46 VA c. (a) Vb=353.34 V, (b) Ic=3.85 A, (c) S = 846.88 + j 2139.49 VA d. (a) Vb=353.34 V, (b) Ic=5.78 A, (c) S = 44820.70 + j 832.58 VA e. (a) Vb=353.34 V, (b) Ic=3.85 A, (c) S = 6775.04 + j 17115.90 VA f. (a) Vb=288.50 V, (b) Ic=3.85…1. A balanced, three-phase, 900V system is supplying a balanced load connected in delta. A three-phase wattmeter (measuring total three-phase power) is connected to the supply and an ammeter is connected to one of the supply phases. Each load consists of a resistance in parallel with an inductive reactance. a. If the wattmeter reads 14.1 kW, what is the resistance of each load? b. If the ammeter reads 10 A What is the impedance (Z) of each load? c. What is the reactance (X)? d. If this load was instead connected in star, what would the new readings be? (P and I).( need only handwritten solution .otherwise downvote.)
- Let the three-phase electrical system be illustrated in Figure . Knowing that its phase sequence is ABC and that Vcb=380∠135°V, determine the following: a) The value of the line currents demanded by each of the loads and supplied by the source. b) The power and power factor of each load and source. c) The power of the capacitor bank that must be installed to correct the power factor to 0.95 lagging. d) The currents supplied by the source after installing the capacitor bank. e) The percentage reduction of the total apparent power supplied by the source after installing the capacitor bank.A star-connected three phase power pack is connected to balanced star-connectedload of 2 + j3 Ω. The line current is 2∠0⁰ A. Assuming negligible impedance onthe cable, calculate:a) the phase and line voltages from the source. b) the real and reactive powers of the circuit.Three parallel three-phase loads are supplied from a 207.85-Vrms, 60-Hz three-phase supply. Theloads are as follows:Load 1: 11 kW with 0.6 lagging power factor.Load 2: Resistive load of 11 kW.Load 3: capacitor load of 9 kvar.(a) What is the total system kW, kvar, power factor, and the supply current per phase?(b) What is the system power factor and the supply current per phase when the Load-1 and Load-2 areoperating but the Load-3 is switched off?