Faults at bus \(n\) in Problem 9.8 are of interest (the instructor selects \(n=1,2,3,4\), or 5). Determine the Thévenin equivalent of each sequence network as viewed from the fault bus. Prefault voltage is 1.0 per unit. Prefault load currents and \(\Delta-Y\) phase shifts are neglected.

Data From Problem 9.8:-

Equipment ratings for the five-bus power system shown in Figure 7.15 are given as follows:

Draw the zero-, positive-, and negative-sequence reactance diagrams using a 100MVA, \(15-\mathrm{kV}\) base in the zone of generator G2. Neglect \(\Delta-\mathrm{Y}\) transformer phase shifts.

Figure 7.15:-

Transcribed Image Text:

Generator Gl: Generator G2: Transformer T1: Transformer T2: Each 138-kV line: X = 40 ohms, Xo = 100 ohms 50 MVA, 12 kV, X = X2 = 0.20, X = 0.10 per unit 100 MVA, 15 kV, X = 0.2, X2 = 0.23, X = 0.1 per unit 50 MVA, 10 kV Y/138 kV Y, X = 0.10 per unit 100 MVA, 15 kV A/138 kV Y, X = 0.10 per unit