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b) The load connected to a three-phase supply comprises three similar coils connected in star. If...
Q3 (3 marks) (4 marks) Two wattmeters are connected in the a and b phases, with...
Q3 (3 marks) (4 marks) Two wattmeters are connected in the a and b phases, with the ends of the voltage coils connected in the c phase, of a balanced three phase star- connected lagging load. Draw a circuit diagram showing the three phases, the wattmeters and the load. Draw a phasor diagram of the phase voltages and currents, the voltages across the wattmeter voltage coils, and the angles between the wattmeter voltages and currents. Show that the sum of...
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of eq...
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of equal phase impedances: Use VAB as reference and determine the following quantities: 4.1 The magnitude and angle of the currents drawn by the star-connected load (IAN; lBN; ICN). 4.1.1 The magnitude and angle of the phase (IAB; lBc; ICa) and line (lA; ls; Ic) currents drawn by the delta-connected load. 4.1.2 (12)...
5 Three inductive coils each of inductance 45mH are connected in star to a 3 phase...
5 Three inductive coils each of inductance 45mH are connected in star to a 3 phase 400V, 50 Hz supply. Calculate the inductance of each coil, which when connected in delta to take the same supply voltage and line current, also find the power delivered at unity power factor for both star and delta connected load. (6 Marks)
(BEKG 2433/BEKP 2323) QUESTION 2 a) A balance three-phase system comprises of star-connected generator and delta-connected...
(BEKG 2433/BEKP 2323) QUESTION 2 a) A balance three-phase system comprises of star-connected generator and delta-connected load are shown in Figure Q2(a). The system are operated based on positive sequence with line voltage Vy - 2402-15°V and load impedance ZxvZYB -ZR - 15+j622. Analyze the phase difference between the line and phase currents with the proper calculation and show the phasor diagrams (11 marks) Zar 1 Y Zvo Figure Q2 (a): A balance three-phase system.
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. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j...
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j...
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
Q3. (10 marks) A three-phase delta-connected load absorbs 7.5 kW at a lagging power factor of...
Q3. (10 marks) A three-phase delta-connected load absorbs 7.5 kW at a lagging power factor of 0.823 when connected to a 660 V, 3-phase supply. Calculate the three line currents in the circuit. Answers: (7.972 -34.61) A. (7972-154,61) A. (7.972-274.619) A.
QUESTION 4: A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A...
QUESTION 4: A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: ZA ZZ10410' BN A delta-connected load of equal phase impedances: ZB15435Z=30Z-75Zc=(19+j27 )n 4.1 Use VAB as reference and detemine the following quantities: The magnitude and angle of the currents drawn by the star-connected load (lAN lEN, ICN) 4.1.1 (6) 4.1.2 The magnitude and angle of the phase (IAB; lBc; IcA) and line (IA; lB; Ic) currents drawn...
A three-phase generator connected in a star generates a phase voltage of Vθ = 24 KVrms and supplies a three-phase transformer connected in star. The transformation ratio is 115: 1. Each of the three c...
A three-phase generator connected in a star generates a phase voltage of Vθ = 24 KVrms and supplies a three-phase transformer connected in star. The transformation ratio is 115: 1. Each of the three coils of the secondary transformer feed 3 equal charges each composed of them by R = 18Ω, XC = 2Ω and XL = 20Ω. a) Calculate the phase, line and charge currents after the b) Calculate the phase, line and load voltages c) Calculate the Apparent...
Q3 (3 marks) (4 marks) Two wattmeters are connected in the a and b phases, with the ends of the voltage coils connected in the c phase, of a balanced three phase star- connected lagging load. Draw a circuit diagram showing the three phases, the wattmeters and the load. Draw a phasor diagram of the phase voltages and currents, the voltages across the wattmeter voltage coils, and the angles between the wattmeter voltages and currents. Show that the sum of...
ELE2601/101/3/2019 QUESTION 4 A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: A delta-connected load of equal phase impedances: Use VAB as reference and determine the following quantities: 4.1 The magnitude and angle of the currents drawn by the star-connected load (IAN; lBN; ICN). 4.1.1 The magnitude and angle of the phase (IAB; lBc; ICa) and line (lA; ls; Ic) currents drawn by the delta-connected load. 4.1.2 (12)...
5 Three inductive coils each of inductance 45mH are connected in star to a 3 phase 400V, 50 Hz supply. Calculate the inductance of each coil, which when connected in delta to take the same supply voltage and line current, also find the power delivered at unity power factor for both star and delta connected load. (6 Marks)
(BEKG 2433/BEKP 2323) QUESTION 2 a) A balance three-phase system comprises of star-connected generator and delta-connected load are shown in Figure Q2(a). The system are operated based on positive sequence with line voltage Vy - 2402-15°V and load impedance ZxvZYB -ZR - 15+j622. Analyze the phase difference between the line and phase currents with the proper calculation and show the phasor diagrams (11 marks) Zar 1 Y Zvo Figure Q2 (a): A balance three-phase system.
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
I. A balanced three-phase positive sequence wye-connected 60Hz source voltage has line-neutral voltage of V, 1000 V. It is connected to a three- phase wye connected load whose impedance is z 50+j37.7 2 a. Find line currents ia ib, ic and line-line voltages Vab, Vbo Vac b. Find the total complex power delivered to the load. c. Find delta-connected capacitor bank needed to bring the PF to 0.95 (lagging) of system. d. Re-calculate currents la, ib, io with Case c....
Q3. (10 marks) A three-phase delta-connected load absorbs 7.5 kW at a lagging power factor of 0.823 when connected to a 660 V, 3-phase supply. Calculate the three line currents in the circuit. Answers: (7.972 -34.61) A. (7972-154,61) A. (7.972-274.619) A.
QUESTION 4: A 400 V three-phase, 50 Hz system, ABC sequence supplies the following loads: A star-connected load with the following phase impedances: ZA ZZ10410' BN A delta-connected load of equal phase impedances: ZB15435Z=30Z-75Zc=(19+j27 )n 4.1 Use VAB as reference and detemine the following quantities: The magnitude and angle of the currents drawn by the star-connected load (lAN lEN, ICN) 4.1.1 (6) 4.1.2 The magnitude and angle of the phase (IAB; lBc; IcA) and line (IA; lB; Ic) currents drawn...
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