Consider the system shown in Figure 9.18. (a) As viewed
Chapter , Problem 9.11(choose chapter or problem)
Consider the system shown in Figure 9.18. (a) As viewed from the fault at F, determine the Thevenin equivalent of each sequence network. Neglect DY phase shifts. (b) Compute the fault currents for a balanced three-phase fault at fault point F through three fault impedances ZFA _ ZFB _ ZFC _ j0:5 per unit. Equipment data in per-unit on the same base are given as follows: Synchronous generators: G1 X1 _ 0:2 X2 _ 0:12 X0 _ 0:06 G2 X1 _ 0:33 X2 _ 0:22 X0 _ 0:066 Transformers: T1 X1 _ X2 _ X0 _ 0:2 T2 X1 _ X2 _ X0 _ 0:225 T3 X1 _ X2 _ X0 _ 0:27 T4 X1 _ X2 _ X0 _ 0:16 Transmission lines: L1 X1 _ X2 _ 0:14 X0 _ 0:3 L1 X1 _ X2 _ 0:35 X0 _ 0:6
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