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QUESTION 3 [12 MARKS Figure 3 shows a balanced Y-Y connection. It has a positive abe...
QUESTION 2 (25 MARKS] Figure 2 shows a three phase network circuit analysis of A-Y configuration...
QUESTION 2 (25 MARKS] Figure 2 shows a three phase network circuit analysis of A-Y configuration with balanced load; Z. = Zo = Z = 60-100 . 1.-52. 120° A VE 1.2 52 120° A Voe mo + Z. zo Vos le $ VD vu z. V2 I-520A + Figure 2 a) Determine load currents (Iza, Izo and Ize) in polar form. (3 Marks) (CO2, PO2, C4) b) Determine load voltage (Vza, Vzo and Vze) in polar form. [9 Marks)...
a) Figure 3 shows a Y-connected source driving a A-connected load. This system has a balanced load where Zs-Zb-Z-502...
a) Figure 3 shows a Y-connected source driving a A-connected load. This system has a balanced load where Zs-Zb-Z-50225°2. The polar expression for VLI is 784197e V. From Figure 3, Lu V. Figure 3 i) Determine the load voltages. (3 Marks) ii Determine the magnitude the line currents. (1 Mark) ) Determine the magnitude of phase currents. (1 Mark) iv) Draw a phasor diagram of phase voltages and line voltages. (6 Marks) v) Determine the load currents. 3 Marks)
a)...
The three figures below show a balanced three phase Delta, its Wye equivalent and the single...
The three figures below show a balanced three phase Delta, its Wye equivalent and the single phase equivalent of the three phase Wye. All three representations have a complex load ZALD or ZYLD and a complex line impedance ZLINE Refer to these diagrams when answering questions 1-4. ZLINE Vab= 679 L 30° ZLINE ZALD ZLINE = 2+1 DELTA ZALD= 18+24j2 LINE ZLINE ZLINE ZYLD 7yun WYE WYE ZYLD ZLINE ZLINE Van Complex Load ZYLD Single Line WYE 1) In the...
QUESTION 5 In a Y-connected, 3-phase, 4-wire p.p.s load, a current of 45.9L -36 A is...
QUESTION 5 In a Y-connected, 3-phase, 4-wire p.p.s load, a current of 45.9L -36 A is flowing in the neutral. The positive and negative symmetrical components of the current in line b are: 1b2 = 18.6 L-15 A 1b1 = 21.3 L 64 A The voltage drops across the phases of the load are: Vc = 184 L 52 V Vo=226 L 60 V Va= 204 L-85 V 5.1 Calculate the impedances of the load [14] 5.2 Calculate the total...
5 points uestion # Part-l Figure 4 shows a Δ-A configuration of a Δ-connected 3-phase source supp...
5 points uestion # Part-l Figure 4 shows a Δ-A configuration of a Δ-connected 3-phase source supplying power to a Δ- connected 3-phase load. The following parameters are known Source Voltage Source Impedance Load Impedance Feeder Impedance y, = 180.0-v (rms) z, = 0.15 +/0.45 Ω Z1-0.1 +/0.2 Ω lA Vp AB ZA Zi ICA Feeder Lines 3-Phase Source Balanced Load Figure 4 a. Compute the line currents IA IB, and lc. (5 points) b. Find the load currents IAB,...
Question 4 [12 marks] Some applications of mathematics require the use of very large matrices (several...
Question 4 [12 marks] Some applications of mathematics require the use of very large matrices (several thousand rows for example) and this in turn directs attention to efficient ways to manipulate them. This question focuses on the efficiency of matrix multiplication, counting the number of numerical arithmetic operations (addition, subtraction and multiplication) involved. We start with very simplest case of 2x2 matrices. (a) The standard way of multiplying 2x2 matrices uses 8 multiplications and 4 additions. List the 8 products...
QUESTION 2 (25 MARKS] Figure 2 shows a three phase network circuit analysis of A-Y configuration with balanced load; Z. = Zo = Z = 60-100 . 1.-52. 120° A VE 1.2 52 120° A Voe mo + Z. zo Vos le $ VD vu z. V2 I-520A + Figure 2 a) Determine load currents (Iza, Izo and Ize) in polar form. (3 Marks) (CO2, PO2, C4) b) Determine load voltage (Vza, Vzo and Vze) in polar form. [9 Marks)...
a) Figure 3 shows a Y-connected source driving a A-connected load. This system has a balanced load where Zs-Zb-Z-50225°2. The polar expression for VLI is 784197e V. From Figure 3, Lu V. Figure 3 i) Determine the load voltages. (3 Marks) ii Determine the magnitude the line currents. (1 Mark) ) Determine the magnitude of phase currents. (1 Mark) iv) Draw a phasor diagram of phase voltages and line voltages. (6 Marks) v) Determine the load currents. 3 Marks)
a)...
The three figures below show a balanced three phase Delta, its Wye equivalent and the single phase equivalent of the three phase Wye. All three representations have a complex load ZALD or ZYLD and a complex line impedance ZLINE Refer to these diagrams when answering questions 1-4. ZLINE Vab= 679 L 30° ZLINE ZALD ZLINE = 2+1 DELTA ZALD= 18+24j2 LINE ZLINE ZLINE ZYLD 7yun WYE WYE ZYLD ZLINE ZLINE Van Complex Load ZYLD Single Line WYE 1) In the...
QUESTION 5 In a Y-connected, 3-phase, 4-wire p.p.s load, a current of 45.9L -36 A is flowing in the neutral. The positive and negative symmetrical components of the current in line b are: 1b2 = 18.6 L-15 A 1b1 = 21.3 L 64 A The voltage drops across the phases of the load are: Vc = 184 L 52 V Vo=226 L 60 V Va= 204 L-85 V 5.1 Calculate the impedances of the load [14] 5.2 Calculate the total...
5 points uestion # Part-l Figure 4 shows a Δ-A configuration of a Δ-connected 3-phase source supplying power to a Δ- connected 3-phase load. The following parameters are known Source Voltage Source Impedance Load Impedance Feeder Impedance y, = 180.0-v (rms) z, = 0.15 +/0.45 Ω Z1-0.1 +/0.2 Ω lA Vp AB ZA Zi ICA Feeder Lines 3-Phase Source Balanced Load Figure 4 a. Compute the line currents IA IB, and lc. (5 points) b. Find the load currents IAB,...
Question 4 [12 marks] Some applications of mathematics require the use of very large matrices (several thousand rows for example) and this in turn directs attention to efficient ways to manipulate them. This question focuses on the efficiency of matrix multiplication, counting the number of numerical arithmetic operations (addition, subtraction and multiplication) involved. We start with very simplest case of 2x2 matrices. (a) The standard way of multiplying 2x2 matrices uses 8 multiplications and 4 additions. List the 8 products...
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