Problem 15. Two wattmeters are connected to measure the input power to a balanced 3-phase load by the two-wattmeter method. If the instrument readings are 8kw and 4 kW, determine (a) the total power input and (b) the load power factor.
Q: Problem 15. Two wattmeters are connected o measure the input power to a balanced 3-phase load by the…
A: The solution can be achieved as follows.
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Q: Two wattmeter's are connected to measur the input power of a balanced three phase load by two…
A: Watt-merter reading W1 = 8800w W2 = 3500 W
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A: From the given power system network Impedance matrix is develop as shown below
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A: The solution can be achieved as follows.
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Q: The terminal voltage of a 3-φ generator is 19053 V, line-to-line. The load draws a current of 3150…
A: To find the total reactive power, Q delivered by the generator
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A: This question belongs to electrical power system . It is based on the concept of delta connected…
Q: Two wattmeter’s are connected to measure the input power of a balanced three phase load by two…
A: For this problem we can easily found power factor. As wattmeter is connected with reverse switch we…
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A: Line Voltage is given, VL=120V For delta connection, Line voltage and phase voltage will be same…
Q: The terminal voltage of a 3-φ generator is 19053 V, line-to-line. The load draws a current of 2727…
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A: The solution is given below
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A: The solution can be achieved as follows.
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A: Given, Common base power, SB = 100 MVA Base voltage = 32.75 KV
Q: Two wattmeter’s are connected to measure the input power of a balanced three phase load by two…
A: As one of wattmeter is connected with reverse switch so it will reading negative power.
Q: The terminal voltage of a 3-φ generator is 19053 V, line-to-line. The load draws a current of 2727…
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A: Given Va =20Vrms∠0°Vb =20Vrms∠-120°Vc =20Vrms∠120°f =400 Hz Za =6+j1ΏZb =5+j5ΏZc =3-j2Ώ
Q: Problem 15. Two wattmeters are connected to measure the input power to a balanced 3-phase load by…
A: Total active power =W1+W2 Reactive power=3*(w1-W2) power factor=cos(arctan(Reactive powerActive…
Q: 5. Assume that a 2.5-kV 1-phase circuit feeds a load of 450 kW at a lagging load power factor and…
A: consider the given question;
Q: Two-watt meters are connected to measure the input power to a balanced three-phase load. If the…
A: Given, Two wattmeter reading W1=9.3 kWW2=5.4 kW
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A: The solution can be achieved as follows.
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Q: Note: It is expected from student to develop impedance matrices of three phase power system. Develop…
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Q: Find the line current, power factor, a
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A: The given system is, For generator: For motor: And
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- The terminal voltage of a 3-φ generator is 19053 V, line-to-line. The load draws a current of 1515 A, leading, with a phase angle of 30o. The total real power, drawn by the load would be:Two three-phase generators supply a three-phase load through separate three-phase lines. The load absorbs 30 kW at 0.8 power factor lagging. The line impedance is (1.4+j1.6) per phase between generator G1 and the load, and (0.8+j1) per phase between generator G2 and the load. If generator G1 supplies 15 kW at 0.8 poir factor lagging, with a terminal voltage of 460 V line-to-line, determine (a) the voltage at the load terminals. (b) the voltage at the terminals of generator G2, and (c) the real and reactive power supplied by generator G2. Assume balanced operation.Consider a single-phase load with an applied voltage v(t)=150cos(t+10)volts and load current i(t)=5cos(t+50)A. (a) Determine the power triangle. (b) Find the power factor and specify whether it is lagging or leading. (c) Calculate the reactive power supplied by capacitors in parallel with the load that correct the power factor to 0.9 lagging.
- A single-phase source is applied to a two-terminal, passive circuit with equivalent impedance Z=3.045, measured from the terminals. The source current is i(t)=22cos(t)kA. Determine the (a) instantaneous power, (b) real power, (c) reactive power delivered by the source, and (d) source power factor.Consider a three-phase Y-connected source feeding a balanced- load. The phasor sum of the line currents as well as the neutral current are always zero. (a) True (b) FalseProblem 3Two three phase Y balanced loads are powered by a Y generator with phase voltage of 120 V rms. The consumptions are: Load 1 of 10 kW with a power factor of 0.9 in lag; load 2 of 5 kW with power factor of 0.95 in advance. Find the magnitude of the generator line current and the total complex power it supplies.
- A three-phase generator in Y is connected to a balanced three-phase load in Δ of Z= 2.24∠26.57° Ω. If Van = 120∠30° and Vbn = 120∠150°, determine the line voltages and currents.A three-phase, 3-wires CBA System alternator, sending 3-phase voltages of 339.4 volt to the lines, having a delta connected load, with VCA is the reference vector. ZBC = 12.99 – j7.5 ZCA = 8.66 + j5 ZAB = 10 + j0 Determine the phase and line current b) draw the phasor diagram and c) true power generates by the generator neglect the line losses.Two-watt meters are connected to measure the input power to a balanced three-phase load. If the wattmeter readings are 9.3 kW and 5.4 kW, determine (a) the total output power, and (b) the load power factor. Answers in magnitude form.
- The three-phase power and line-line ratings of the electric power system shown in Figure-1 are given below: G1:82 MVA 30 kV X=10% T1:72MVA 30/300 kV X=11% T2:72MVA 300/30 kV X=11% M:62MVA 25 kV X=9% 300 kV Z= 89+j179 Apply the knowledge of per unit system on above network and draw an impedance diagram showing all impedances in per unit when Sb =100MVA and Vb = 30 kvThe terminal voltage of a 3-φ generator is 19053 V, line-to-line. The load draws a current of 2727 A, lagging, with a phase angle of 30o. The total reactive power, Q, delivered by the generator would be:For balanced Y - ∆ connected three-phase system, at 60 Hz during generator positive phaseIt provides 230 V nominal rms line voltage. Balanced load from three identical impedances ZAB = ZBC = ZCA=It consists of 20∠45 °. All generator and line impedances can be neglected. Power supplied to the load, all phase anddetermine load voltages and line currents? (Note = take = 230∠30 ° V)