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4- A 208 V delta-connected source is energizing two parallel loads. One...
10. Two loads connected in parallel draw a total of 2.4 kW at 0.8 pflagging from...
10. Two loads connected in parallel draw a total of 2.4 kW at 0.8 pflagging from a 120-V rms, 60- Hz line. One load absorbs 1.5 kW at a 0.707 pf lagging. Determine: (a) the pf of the second load, INV 11. Calculate the line currents for the system shown in figure. Calculate also the total power and reactive power consumed by the load. w 12. For the balanced three-phase circuit in Fig.. Calculate the line currents, the phase voltage...
2. Two balanced three-phase loads are connected in parallel. One load with per phase impedance 21...
2. Two balanced three-phase loads are connected in parallel. One load with per phase impedance 21 ?, is connected in delta, and the other load has per phase impedance 15 2 and is connected in wye. Ignore the line impedance. If the line voltage is a 208230° Vrms, determine (a) the phase voltage for phase-a, ) the line current Ia*, (c) the phase currents in the delta load (d) the complex power of the load and the power factor.
A balanced three-phase source with a 208 V rms (line-to-line) is delivering power to a balanced...
A balanced three-phase source with a 208 V rms (line-to-line) is delivering power to a balanced Y-connected load with phase impedance Z1 = 4 + j 3 Ohms in parallel with a balanced delta-connected load with phase impedance Z2 = 7.5 + j 6 Ohms. Calculate the active (real) and reactive (imaginary) powers delivered by the source. Draw the power triangle. What is the power factor of the combined load?
508 CHAPTER 11 . POLYPHASE CIRCUITS 11.40 In a balanced three-phase system, the source has an...
508 CHAPTER 11 . POLYPHASE CIRCUITS 11.40 In a balanced three-phase system, the source has an aboc phase-sequence and is connected in delta. There are two rallel wye-connected loads. The phase impedance of load i and load 2 is 4 The line impedance connecting the source to the loads is 0.3 + j0.2 2. If the curre IAN! = 10/20-Arms, find the delta currents in the source 4 Ω and 10 +/4 Ω, respectively. nt in the a phase of...
A three-phase line, which has an impedance of (2 + j4) Ω per phase, feeds two...
A three-phase line, which has an impedance of (2 + j4) Ω per phase, feeds two balanced three-phase loads that are connected in parallel. One of the loads is Y- connected with an impedance of (30 + j40) Ω per phase, and the other is delta- connected with an impedance of (60 + j45) Ω per phase. The line is energized at the sending end from a 60-Hz, three phase, balanced voltage source of 120√3 V (rms, line- to-line). Determine...
Two electrical loads are connected in parallel to a 380 V, 50 Hz, three phase supply....
Two electrical loads are connected in parallel to a 380 V, 50 Hz, three phase supply. The first load consists of three identical impedance each 7 Ω resistance and 5Ω inductive resistance, connected in star. The second load consists of three identical impedances, each 12 Ω resistance and 8 Ω capacitive reactance connected in delta. Sketch the arrangement described above Calculate Zph1 and Zph2[Zph1= 8.6Ω 35.54°; Zph2= 14.42 Ω -33.69°] Determine Iph1 and Iph2[Iph1= 25.51A -35.54°; Iph2= 26.35A +33.69°] IL1...
9. A three phase balanced Y connected source is supplying three, three phase loads that are...
9. A three phase balanced Y connected source is supplying three, three phase loads that are connected in parallel. First load is a y connected and has an impedance of 30+j40 ohms. The second load is absorbing a total of 150kVA at 0.5 power factor lagging. The third load is absorbing 150kVA at 0.5 power factor leading. The line to line source rms voltage is 2500V. i Find the load current in each load i) Find the total real and...
Problem 7 Three three-phase wye-connected loads are in parallel across a three-phase supply. The first load draws a cur...
Problem 7 Three three-phase wye-connected loads are in parallel across a three-phase supply. The first load draws a current of 10 A at pf- 0.93 (leading), and the second and third loads (each) draw a current of 20 A at pf= 0.85 (lagging). Suppose the line-to-line voltage is 240 V. Compute the following: a) The transmission line current b) The load power factor c) The complex power supplied by the source
Problem 7 Three three-phase wye-connected loads are in parallel...
3- Two balanced Y-connected loads in parallel, one drawing 25 kW at 0.6 power factor lagging...
3- Two balanced Y-connected loads in parallel, one drawing 25 kW at 0.6 power factor lagging and the other drawing 15 kVA at 0.8 power factor leading, are supplied by a balanced, three-phase, 480-volt source. (a) Draw the power triangle for each load and for the combined load. (b) Determine the power factor of the combined load and state whether lagging or leading. (c) Determine the magnitude of the line current from the source. (d) ∆- connected capacitors are now...
Problem 3: (20 points) ase serves two balanced parallel loads. The line- A three-phase transmission line...
Problem 3: (20 points) ase serves two balanced parallel loads. The line- A three-phase transmission line with an impedance (0.2 +j1.0) 12/phase serves two balan to-line voltage at the load end of the line is 480 V (rms). Load 1: Wye-connected and absorbs a total of 200 kW with a lagging p.f. of 0.87. Load 2: Delta-connected with an impedance of (20+30) 2/phase. a. Draw the single phase representation of the circuit b. How much current flows through phase A...
10. Two loads connected in parallel draw a total of 2.4 kW at 0.8 pflagging from a 120-V rms, 60- Hz line. One load absorbs 1.5 kW at a 0.707 pf lagging. Determine: (a) the pf of the second load, INV 11. Calculate the line currents for the system shown in figure. Calculate also the total power and reactive power consumed by the load. w 12. For the balanced three-phase circuit in Fig.. Calculate the line currents, the phase voltage...
2. Two balanced three-phase loads are connected in parallel. One load with per phase impedance 21 ?, is connected in delta, and the other load has per phase impedance 15 2 and is connected in wye. Ignore the line impedance. If the line voltage is a 208230° Vrms, determine (a) the phase voltage for phase-a, ) the line current Ia*, (c) the phase currents in the delta load (d) the complex power of the load and the power factor.
508 CHAPTER 11 . POLYPHASE CIRCUITS 11.40 In a balanced three-phase system, the source has an aboc phase-sequence and is connected in delta. There are two rallel wye-connected loads. The phase impedance of load i and load 2 is 4 The line impedance connecting the source to the loads is 0.3 + j0.2 2. If the curre IAN! = 10/20-Arms, find the delta currents in the source 4 Ω and 10 +/4 Ω, respectively. nt in the a phase of...
9. A three phase balanced Y connected source is supplying three, three phase loads that are connected in parallel. First load is a y connected and has an impedance of 30+j40 ohms. The second load is absorbing a total of 150kVA at 0.5 power factor lagging. The third load is absorbing 150kVA at 0.5 power factor leading. The line to line source rms voltage is 2500V. i Find the load current in each load i) Find the total real and...
Problem 7 Three three-phase wye-connected loads are in parallel across a three-phase supply. The first load draws a current of 10 A at pf- 0.93 (leading), and the second and third loads (each) draw a current of 20 A at pf= 0.85 (lagging). Suppose the line-to-line voltage is 240 V. Compute the following: a) The transmission line current b) The load power factor c) The complex power supplied by the source
Problem 7 Three three-phase wye-connected loads are in parallel...
Problem 3: (20 points) ase serves two balanced parallel loads. The line- A three-phase transmission line with an impedance (0.2 +j1.0) 12/phase serves two balan to-line voltage at the load end of the line is 480 V (rms). Load 1: Wye-connected and absorbs a total of 200 kW with a lagging p.f. of 0.87. Load 2: Delta-connected with an impedance of (20+30) 2/phase. a. Draw the single phase representation of the circuit b. How much current flows through phase A...
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