- Question 3 50 Marks Figure 1 Shows A Five Bus Power System Equipment Parameters Are As Given Below Synchronous Gene 1 (37.89 KiB) Viewed 23 times
- Question 3 50 Marks Figure 1 Shows A Five Bus Power System Equipment Parameters Are As Given Below Synchronous Gene 2 (79.54 KiB) Viewed 23 times
T3: 500MVA, 13.8kV A/500kV Y X = 0.10 p.u. T4: 1000MVA, 20.0kV A/500kV Y X=0.10 p.u. Transmission Lines: TL_12 : 500MVA, 500kV, Xı = 5002 TL_23 : 500MVA, 500kV, Xi = 5092 TL_24 : 500MVA, 500kV, X1 = 500 TL_35: 500MVA, 500kV, Xi = 5002 Bus 1 Bus 2 Xe =1502 Xo = 1500 Xo = 1500 X = 15002 Bus 3 TL_12 DO TL_23 4 AY T BA YA T4 TL_241 TL_35 Bus 4 OBA Bus 5 T2 Da! T3 OBE Δ Figure 1 per Using a 500MVA base, and a 500kV base in the zone of the transmission lines, draw the unit sequence networks. Neglect the A-Y transformer phase shifts. (b) Determine the Thevenin equivalent networks of the sequence networks "looking in" at bus 4. Faults at bus 4 will be of interest. Neglect pre-fault currents, and assume a pre-fault voltage of V; = 1.0 p.u. 20° at all buses. Consider a balanced three-phase fault at bus 4. Calculate the per unit sequence currents (10.1.2), per unit sequence voltages (V0.1.2), per unit phase currents (IA.B.C) and per unit phase voltages (VAB.c). Also express all these voltages and currents in physical units (Volts and Amps). (d) Same for a solid line to ground fault; (e) Same for a solid line to line fault; (1) Same for a solid double line to ground fault.