The Component Parameters For The Power System

Question

The component parameters for the power system shown in Figure 2 are given in Table 1. The pre-fau…

The component parameters for the power system shown in Figure 2 are given in Table 1. The pre-fault voltage is 120° pu and Zx-j0.1 pu. Table 1 Ratings X2-Xi (pu)Xo (pu) 0.05 0.10 0.20 0.20 Components G1, G2 200 MVA, 20 kV 0.10 0.10 0.10 0.10 T1, T2, T3200 MVA, 20/200 kV L1 200 MVA, 200 kV し2 200 MVA, 20 kV (a) Draw the three sequence networks and determine the per-unit Thevenin impedance of each sequence network seen from Bus 4 (b)Ifa bolted double-phase-to-ground fault between phases b and c occurs at Bus 4, determine (i)the pu positive sequence current and voltage at Bus 4, (ii)the pu zero sequence current and its path in each component, and (iii) the pu negative sequence voltages at Bus 1 and Bus 6 Bus 1 T1 Bus3 G1 Bus 4 T3 Bus 5 Bus 6 R1 L2 R5 Bus 2 T2 R3 R4 G2 R2 Figure 2

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