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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...
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...
Consider a 3-phase inverter with a delta-connected load operating from a 150 V DC input voltage....
Consider a 3-phase inverter with a delta-connected load operating from a 150 V DC input voltage. The AC load consists of 3 identical impedances with R = 6 Ω and L = 30 mH and a frequency of 60 hz. a. Determine the RMS line voltage VAB. b. Obtain mathematical expressions for each phase of the load currents, IAB, IBC, and ICA.
A three unbalanced delta-connected load is connected a three-phase 380 V, 50 Hz power source with phase sequence ABC as shown in figure Q2. The impedance of the loads Z1, Z2, and Z3 are 30 + j25 Ω, 25 + j10 Ω , 15 - j35 Ω respectively. By taking the phase
(a) the line voltages VAB, VBC, VCA; (3 marks)
(b) the phase currents Iab, Ibc and Ica of the load; (6 marks)
(c) the line currents IAa, IBb and ICc; (6 marks)
(d) the total real power PT dissipation of the load; (2 marks)
(e) the total reactive power QT of the load; (2 marks)
(f) the apparent power drawn by the load; and (2 marks)
(g) the overall power factor of the system. (2 marks)
Q2. A three-phase unbalanced delta-connected load containing impedances Z1, Z2 and resistor R3 is connected to...
Q2. A three-phase unbalanced delta-connected load containing impedances Z1, Z2 and resistor R3 is connected to a three-phase power source of 380 V, 50 Hz in positive sequence A-B-C as shown in figure Q2. It is known that line current Ic is 54 292° A. The power consumption of load R3 is 18050 W. The impedance of Zi is 20 -70° 2. By taking VAB as reference, calculate B BB/ Z2 TBC figure Q2 (a) the line voltage VAB, VBC...
In a balanced three-phase Y-A system, the source has an ABC phase sequence and Van=114/_43° V...
In a balanced three-phase Y-A system, the source has an ABC phase sequence and Van=114/_43° V rms. The line and load impedances are Z1 = R1 + jX1 = 2 + j1.82 and Zab = Rab + jXab = 54 + j3922, respective А RijX w IAa a VAN n Lab Ica јХca, Rab VON N VBN Rca jXab C B Roc jXbo с b RjX2 Wm Wm R3 jX3 Find the magnitude of the delta current Iab, Ibc, or...
b) The load connected to a three-phase supply comprises three similar coils connected in star. If...
b) The load connected to a three-phase supply comprises three similar coils connected in star. If the phase currents are 10A and the total active power and power factor absorb by the loads are 3kW and 0.8 lagging, respectively. Find: i. The magnitude of phase and line voltages (4 marks) ii. Total apparent power (1 mark) iii. The impedance of each coil. (2 marks) c) If the coil in Q3(b) are now connected in delta to the same three-phase supply,...
2. A 230V, 3 phase, 3 wire abc system supplies a wye connected load with impedances,...
2. A 230V, 3 phase, 3 wire abc system supplies a wye connected load with impedances, Za-10+j0, Zb=3+j4 and Zc 0-j 10, all in ohms. Determine: a. ) Find the line currents a and b. b.) Determine the total power of the system. c.) Verify (b), using two wattmeter method, with line 'a' as the free node. d.) What are the symmetrical components of the line currents using the result in (a). Verify your answers if correct using Fortesques theory.
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system supplies a 20 kVA, three-phase induction motor load at a power factor of 0 8 lagging, and a star-connected set of...
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system supplies a 20 kVA, three-phase induction motor load at a power factor of 0 8 lagging, and a star-connected set of impedances, each having a resistance of 10 Ω and an inductive reactance of 8 Ω Calculate the capacitance of delta-connected capacitors required to improve the overalil power factor to 0 95 lagging [14] TOTAL 1001
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system...
connected 3-phase load consisting of three identical impedances Z= 48ے36.870 W. 3-Phase System Using MATLAB/Simulink Analysis of Y-Y connected balanced 3-phase circuit using Matlab A 2400-V...
connected 3-phase load consisting of three identical impedances Z=
48ے36.870 W.
3-Phase System Using MATLAB/Simulink Analysis of Y-Y connected balanced 3-phase circuit using Matlab A 2400-V rms balanced 3-phase 60-Hz supply is applied to a balanced Y-connected 3-phase load consisting of three identical impedances Z- 4836.870 W. The circuit diagram is shown in Fig. 3. Taking the phase to neutral voltage Van as reference. Calculate 1) The phase &line voltage Van, Vab 2) The phase current for any phase- line...
Question 2: Three phase circuit. (100p) A wye connected generator supplies a delta connected balanced load...
Question 2: Three phase circuit. (100p) A wye connected generator supplies a delta connected balanced load through short feeder. seree the load line to neutral voltage as reference voltage phase angle zero. 02.1 Q2.2 Q2.3 Q2.4 Draw the equivalent circuit. 10p Calculate the load line-to-neutral voltages and line-to-line voltages. 20p Calculate the delta load currents and feeder currents. 20p Calculate the supply wye connected generator line-to-neutral voltages. Is the obtained values are acceptable? Calculate the generator real and reactive power...
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...
Q2. A three-phase unbalanced delta-connected load containing impedances Z1, Z2 and resistor R3 is connected to a three-phase power source of 380 V, 50 Hz in positive sequence A-B-C as shown in figure Q2. It is known that line current Ic is 54 292° A. The power consumption of load R3 is 18050 W. The impedance of Zi is 20 -70° 2. By taking VAB as reference, calculate B BB/ Z2 TBC figure Q2 (a) the line voltage VAB, VBC...
In a balanced three-phase Y-A system, the source has an ABC phase sequence and Van=114/_43° V rms. The line and load impedances are Z1 = R1 + jX1 = 2 + j1.82 and Zab = Rab + jXab = 54 + j3922, respective А RijX w IAa a VAN n Lab Ica јХca, Rab VON N VBN Rca jXab C B Roc jXbo с b RjX2 Wm Wm R3 jX3 Find the magnitude of the delta current Iab, Ibc, or...
b) The load connected to a three-phase supply comprises three similar coils connected in star. If the phase currents are 10A and the total active power and power factor absorb by the loads are 3kW and 0.8 lagging, respectively. Find: i. The magnitude of phase and line voltages (4 marks) ii. Total apparent power (1 mark) iii. The impedance of each coil. (2 marks) c) If the coil in Q3(b) are now connected in delta to the same three-phase supply,...
2. A 230V, 3 phase, 3 wire abc system supplies a wye connected load with impedances, Za-10+j0, Zb=3+j4 and Zc 0-j 10, all in ohms. Determine: a. ) Find the line currents a and b. b.) Determine the total power of the system. c.) Verify (b), using two wattmeter method, with line 'a' as the free node. d.) What are the symmetrical components of the line currents using the result in (a). Verify your answers if correct using Fortesques theory.
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system supplies a 20 kVA, three-phase induction motor load at a power factor of 0 8 lagging, and a star-connected set of impedances, each having a resistance of 10 Ω and an inductive reactance of 8 Ω Calculate the capacitance of delta-connected capacitors required to improve the overalil power factor to 0 95 lagging [14] TOTAL 1001
QUESTION 6 (MULTI-PHASE SYSTEMS) A 400 v, 50 Hz, three-phase distribution system...
connected 3-phase load consisting of three identical impedances Z=
48ے36.870 W.
3-Phase System Using MATLAB/Simulink Analysis of Y-Y connected balanced 3-phase circuit using Matlab A 2400-V rms balanced 3-phase 60-Hz supply is applied to a balanced Y-connected 3-phase load consisting of three identical impedances Z- 4836.870 W. The circuit diagram is shown in Fig. 3. Taking the phase to neutral voltage Van as reference. Calculate 1) The phase &line voltage Van, Vab 2) The phase current for any phase- line...
Question 2: Three phase circuit. (100p) A wye connected generator supplies a delta connected balanced load through short feeder. seree the load line to neutral voltage as reference voltage phase angle zero. 02.1 Q2.2 Q2.3 Q2.4 Draw the equivalent circuit. 10p Calculate the load line-to-neutral voltages and line-to-line voltages. 20p Calculate the delta load currents and feeder currents. 20p Calculate the supply wye connected generator line-to-neutral voltages. Is the obtained values are acceptable? Calculate the generator real and reactive power...
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