![QUESTION 2 (25 MARKS] Figure 2 shows a three phase network circuit analysis of A-Y configuration with balanced load; Z. = Zo](http://img.homeworklib.com/questions/b5d7dc20-3ae9-11eb-bd0e-93f56baad8b6.png?x-oss-process=image/resize,w_560)
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QUESTION 2 (25 MARKS] Figure 2 shows a three phase network circuit analysis of A-Y configuration...
a) Discuss the main role of per-unit systems. (CO3:P01 - 3 marks) b) A single phase...
a) Discuss the main role of per-unit systems. (CO3:P01 - 3 marks) b) A single phase two winding transformer rated at 20 kVA, 415/230 volts 50 Hz is subjected to open and short circuit test. Table Q3 (a) summarize the results of the test; Table Q3 (a) Open Circuit Test 12 = 12 A P2 = 200 W Short Circuit Test V1 = 35 V P1 = 300 W I. Based on the short circuit test, determine the equivalent series...
QUESTION 3 [12 MARKS Figure 3 shows a balanced Y-Y connection. It has a positive abe...
QUESTION 3 [12 MARKS Figure 3 shows a balanced Y-Y connection. It has a positive abe sequence. Given, Van = 240 sin(wt + 50°) V, 2 = 5+5j, and 2y = 15 + 15j. Find the following i) Total complex power at the source. 6109.2 L=135°VA ii) Total complex power at the load. 4581-72_450VA iii) Total complex power at the line. 1827 2450 VA iv) Line voltage. V 45.6 21-10V [12 Marks CO2, PO2, C3) N a V Z Z...
A 400-MVA, 200-kV/20-kV, three phase Y-Y transformer has an equivalent series impedance of ZTL = 0.012...
A 400-MVA, 200-kV/20-kV, three phase Y-Y transformer has an equivalent series impedance of ZTL = 0.012 + 20.0162 per phase referred to the low-voltage side (secondary side). The transformer is supplying a three-phase load of 300-MVA, 0.8 power factor lagging at terminal voltage of 20 kV (line-to-line) on its low-voltage side (secondary side) as shown in Fig. 22. The primary is supplied from a transmission line with an impedance of ZL = 0.5 + j1.0 per phase. The line-to-neutral load...
Question 2 (14 Marks) Consider Fig. Q2 below. zi Z 23 R12002 R 1202 R 602...
Question 2 (14 Marks) Consider Fig. Q2 below. zi Z 23 R12002 R 1202 R 602 Xc 600 X.32492 Fig. Q2 The voltage Vrms = 240020° V is applied to a load Zi, Zz and Zs. a) Determine real, reactive and complex power by each load. (COI: PO1: C4 - 9 Marks) b) Determine total complex power in polar form, (C01: P01: C3-1 Marks) c) Sketch all the complex power S., S2. Ss and Stalin vector representation in plane diagram....
Fig. Q3 shows the one-line diagram of a three-phase power system. As shown in Fig. 23,...
Fig. Q3 shows the one-line diagram of a three-phase power system. As shown in Fig. 23, the two zones are connected by a 400 MVA, 240-kV/24-kV, Y-A three phase transformer. The Y-three phase transformer has an equivalent series impedance of 2T - 1.2 + |1.6 per phase referred to the high-voltage side (primary side). The three-phase power system can be studied with per unit quantities using base values of So=500 MVA and 240 kV in zone 1. 2 -1.61253.15" Line...
a) Discuss the main role of per-unit systems. (CO3:P01 - 3 marks) b) A single phase two winding transformer rated at 20 kVA, 415/230 volts 50 Hz is subjected to open and short circuit test. Table Q3 (a) summarize the results of the test; Table Q3 (a) Open Circuit Test 12 = 12 A P2 = 200 W Short Circuit Test V1 = 35 V P1 = 300 W I. Based on the short circuit test, determine the equivalent series...
QUESTION 3 [12 MARKS Figure 3 shows a balanced Y-Y connection. It has a positive abe sequence. Given, Van = 240 sin(wt + 50°) V, 2 = 5+5j, and 2y = 15 + 15j. Find the following i) Total complex power at the source. 6109.2 L=135°VA ii) Total complex power at the load. 4581-72_450VA iii) Total complex power at the line. 1827 2450 VA iv) Line voltage. V 45.6 21-10V [12 Marks CO2, PO2, C3) N a V Z Z...
A 400-MVA, 200-kV/20-kV, three phase Y-Y transformer has an equivalent series impedance of ZTL = 0.012 + 20.0162 per phase referred to the low-voltage side (secondary side). The transformer is supplying a three-phase load of 300-MVA, 0.8 power factor lagging at terminal voltage of 20 kV (line-to-line) on its low-voltage side (secondary side) as shown in Fig. 22. The primary is supplied from a transmission line with an impedance of ZL = 0.5 + j1.0 per phase. The line-to-neutral load...
Question 2 (14 Marks) Consider Fig. Q2 below. zi Z 23 R12002 R 1202 R 602 Xc 600 X.32492 Fig. Q2 The voltage Vrms = 240020° V is applied to a load Zi, Zz and Zs. a) Determine real, reactive and complex power by each load. (COI: PO1: C4 - 9 Marks) b) Determine total complex power in polar form, (C01: P01: C3-1 Marks) c) Sketch all the complex power S., S2. Ss and Stalin vector representation in plane diagram....
Fig. Q3 shows the one-line diagram of a three-phase power system. As shown in Fig. 23, the two zones are connected by a 400 MVA, 240-kV/24-kV, Y-A three phase transformer. The Y-three phase transformer has an equivalent series impedance of 2T - 1.2 + |1.6 per phase referred to the high-voltage side (primary side). The three-phase power system can be studied with per unit quantities using base values of So=500 MVA and 240 kV in zone 1. 2 -1.61253.15" Line...
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