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2. Three loads are connected in parallel across a source as shown. Load...
Example 9 Three loads are connected in parallel across 1400 V, 60 Hz supply: Load 1:...
Example 9 Three loads are connected in parallel across 1400 V, 60 Hz supply: Load 1: 125 KVA, 0.28 PF lag Load 2: 10 kW, 40 kVAR capacitive load Load 3: 15 kW Find the total kW, kVAR, KVA, and the supply power factor . The KVAR and the capacitance in mF of the capacitor needed to improve the PF to 0.8 lagging
3. (40 points) Three-phase loads are connected in parallel across a 24 KV (line-line three-phase power...
3. (40 points) Three-phase loads are connected in parallel across a 24 KV (line-line three-phase power supply. Load 1: 120 KVA at 0.8 power factor leading; Load 2: 180 KW at 0.6 power factor lagging, Load 3: 40 KW at unity power factor Find the total complex power of three loads; (ii) Draw the power triangle of the combined load (ii) Find the overall power factor (iv) Find the line current (magnitude only) in the power supply line.
A three-phase load of 15 kVA with a PF of 0.8 lagging is connected in parallel...
A three-phase load of 15 kVA with a PF of 0.8 lagging is connected in parallel with a three-phase load of 36 kW at 0.6 PF leading. The line-line voltage is 2000V. a) Find the total complex power and power factor. Is it inductive or capacitive? b) How much kVAR is needed to make the PF unity? c) What is the magnitude of the current going into the total load?
The following three-phase, balanced loads are connected across a three-phase, Y-connected 60 Hz source with a...
The following three-phase, balanced loads are connected across a three-phase, Y-connected 60 Hz source with a line-to-line voltage of 480 V. The loads are described below: • Load 1: ∆-connected, total three-phase apparent power is 30 kVA at 0.95 power factor lagging. • Load 2: ∆-connected, total three-phase active power is 20 kW at 0.7 power factor lagging. • Load 3: Y-connected, phase current is 30 A, and power factor is 0.9 pf leading. (a) Calculate the total complex power...
I. Two electric loads are connected in parallel to a source of value u(t) = 300...
I. Two electric loads are connected in parallel to a source of value u(t) = 300 cos(380t) V. The first load absorbs 3 kW at a power factor of 0.5 lagging. The second load absorbs 4kW at a power factor of 0.8 leading. (a) Find the current I through the first load. (b) Find the total current I c) Find the total apparent power (d) Find the total average power e) Find the overall power factor of the two loads...
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...
(a) A 240 V 50 Hz factory electrical system has the following loads connected in parallel:...
(a) A 240 V 50 Hz factory electrical system has the following loads connected in parallel: Load 1: 4 kW at a power factor of 0.8 lag Load 2: 6 kVA at a power factor of 0.6 lag Load3: 6.5 kVA with 2.5 kVAr of leading reactive power Determine: (C) the overall system power factor, (ii) the value of a power-factor correction capacitor to improve the power factor to unity, and (ii) the value of a power-factor correction capacitor to...
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...
5. The line to neutral voltages of a Y-connected three phase source are given by, The...
5. The line to neutral voltages of a Y-connected three phase source are given by, The above three phase source is directly connected to a delta connected balanced three phase resistive load. The resistance in each phase is 10 ohms. Calculate the current phasor 0. Answer- 4. Following three loads are connected in parallel across a single-phase source voltage source: Load 1 absorbs 15 kW and 6.667 kvar; Load 2 absorbs 3 kVA at 0.96PF leading; Load 3 absorbs 15...
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...
Example 9 Three loads are connected in parallel across 1400 V, 60 Hz supply: Load 1: 125 KVA, 0.28 PF lag Load 2: 10 kW, 40 kVAR capacitive load Load 3: 15 kW Find the total kW, kVAR, KVA, and the supply power factor . The KVAR and the capacitance in mF of the capacitor needed to improve the PF to 0.8 lagging
3. (40 points) Three-phase loads are connected in parallel across a 24 KV (line-line three-phase power supply. Load 1: 120 KVA at 0.8 power factor leading; Load 2: 180 KW at 0.6 power factor lagging, Load 3: 40 KW at unity power factor Find the total complex power of three loads; (ii) Draw the power triangle of the combined load (ii) Find the overall power factor (iv) Find the line current (magnitude only) in the power supply line.
I. Two electric loads are connected in parallel to a source of value u(t) = 300 cos(380t) V. The first load absorbs 3 kW at a power factor of 0.5 lagging. The second load absorbs 4kW at a power factor of 0.8 leading. (a) Find the current I through the first load. (b) Find the total current I c) Find the total apparent power (d) Find the total average power e) Find the overall power factor of the two loads...
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...
(a) A 240 V 50 Hz factory electrical system has the following loads connected in parallel: Load 1: 4 kW at a power factor of 0.8 lag Load 2: 6 kVA at a power factor of 0.6 lag Load3: 6.5 kVA with 2.5 kVAr of leading reactive power Determine: (C) the overall system power factor, (ii) the value of a power-factor correction capacitor to improve the power factor to unity, and (ii) the value of a power-factor correction capacitor to...
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...
5. The line to neutral voltages of a Y-connected three phase source are given by, The above three phase source is directly connected to a delta connected balanced three phase resistive load. The resistance in each phase is 10 ohms. Calculate the current phasor 0. Answer- 4. Following three loads are connected in parallel across a single-phase source voltage source: Load 1 absorbs 15 kW and 6.667 kvar; Load 2 absorbs 3 kVA at 0.96PF leading; Load 3 absorbs 15...
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