Figure 2 shows a power system network with three unit of conventional generator, G., G, and Gs. Then, a distributed generator, DG, is comected to Bus 9 to improve supply reliability of the power system. The power system parameters are given in Table 3. Use Stue equals to 100 MVA. Initially, all circuit breakers, CBs, are in CLOSE position Bus 7 YTY CB CB7 CBE GRO Bus 2 T2 C32 T4 CD4 D3 CS3 CB-10 Lud CBI C014 CS5 CE6 CD 13 Bus 11 Y 15 Ti DO Figure 2.11-Bus Power System Network Network Component Generator 1 Generator 2 Generator 3 Distributed Generator Transformer 1 & 2 Transformer 3 & 4 Transformer 5 & 6 Transformer 7 & 8 0.20 p. 0.20 p. 0.20 p. 0,20 p. 0.25 pa 0.25 p. 0.15 p. 0.15 p. 0.20 p. 0.20 p. 0.20 p. 0.20 p. 0.20 pia 0.20 p. 0.20 p. 0.20 p. 0.10 p. 0.10 p. 0.10 p. 0.10 pu 0.10 p. 0.10 p. 0.10 p. 0.10 p.u 0.15 p. 0.15 p. 0.15 pu 0.15 p. 0.10 p. 0.10 p. 0.10 p. 0.10 p. 0.20 p. 0.05 p. 0.25 p. 0.25 p. 0.25p. 0.25 p 0.20 p. 0.20 p. 0.20 p. 0.20 p. 0.25 p. 0.25 p. 0.15 p. Line 4-7 Line 4-8 Line 5-7 Line 5-9 Line 6-8 Line 6-9 Line 11-9 a) Draw the positive, negative and pero sequence impedance network of the power system Show all reactance values in your drawing. [8 marka) b) A single-line-to-ground fault occurred on Bus 9 (phase a). The fault causes CB6, CB12. CB13 and CB14 to trip. Calculate the sequence impedances (Z. Z and 2), and the fault current, Irin per unit. Assunte pre-fault voltage is 1.0 per unit [11 mark) c) Based on the fault as described in part b), determine Bus 7phase a voltage during fault, 16 marka Figure 2 shows a power system network with three unit of conventional generator, G., G, and Gs. Then, a distributed generator, DG, is comected to Bus 9 to improve supply reliability of the power system. The power system parameters are given in Table 3. Use Stue equals to 100 MVA. Initially, all circuit breakers, CBs, are in CLOSE position Bus 7 YTY CB CB7 CBE GRO Bus 2 T2 C32 T4 CD4 D3 CS3 CB-10 Lud CBI C014 CS5 CE6 CD 13 Bus 11 Y 15 Ti DO Figure 2.11-Bus Power System Network Network Component Generator 1 Generator 2 Generator 3 Distributed Generator Transformer 1 & 2 Transformer 3 & 4 Transformer 5 & 6 Transformer 7 & 8 0.20 p. 0.20 p. 0.20 p. 0,20 p. 0.25 pa 0.25 p. 0.15 p. 0.15 p. 0.20 p. 0.20 p. 0.20 p. 0.20 p. 0.20 pia 0.20 p. 0.20 p. 0.20 p. 0.10 p. 0.10 p. 0.10 p. 0.10 pu 0.10 p. 0.10 p. 0.10 p. 0.10 p.u 0.15 p. 0.15 p. 0.15 pu 0.15 p. 0.10 p. 0.10 p. 0.10 p. 0.10 p. 0.20 p. 0.05 p. 0.25 p. 0.25 p. 0.25p. 0.25 p 0.20 p. 0.20 p. 0.20 p. 0.20 p. 0.25 p. 0.25 p. 0.15 p. Line 4-7 Line 4-8 Line 5-7 Line 5-9 Line 6-8 Line 6-9 Line 11-9 a) Draw the positive, negative and pero sequence impedance network of the power system Show all reactance values in your drawing. [8 marka) b) A single-line-to-ground fault occurred on Bus 9 (phase a). The fault causes CB6, CB12. CB13 and CB14 to trip. Calculate the sequence impedances (Z. Z and 2), and the fault current, Irin per unit. Assunte pre-fault voltage is 1.0 per unit [11 mark) c) Based on the fault as described in part b), determine Bus 7phase a voltage during fault, 16 marka