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For the system shown in Fig. P4.5 set up the positive, negative, and zero sequence networks...
6.2 For Problem 4.5, Fig. P4.5, calculate the fault currents at bus H for the following faults: a. a for a phase fault b. laF, IbF, leF for a bc phase fault c. lar, İbF,LF for a bc phase-to-ground fault d. laF, IbF, IeF for an a-to-ground fault. phase fault GEN. GEN. 30 NVA 30 NVA 13.8 kv 13.8:34.5 kv 20 MVA 34.5113.8 kv 13.8 kV 20 MVA x-8x2-221 Figure P45
A single line diagram of a power system is shown in Fig. 2. The system data with equipment ratings and assumed sequence reactances are given the following table. The neutrals of the generator and A-Y transformers are solidly grounded. The motor neutral is grounded through a reactance Xn 0.05 per unit on the motor base. Assume that Pre-fault voltage is takin as VF-1.0 ,0° per unit and Pre- fault load current and Δ-Y transformer phase shift are neglected In the...
1) Consider the power system shown in Fig. 1. Use a power base of 500 MVA to calculate the fault current in amperes for a double line-to-ground fault at bus B. G: 500 MVA, 13.8 kv, xa = 0.2 p.M., X2 = 0.2 p.j. and x = 0.1 p.u. G2:600 MVA, 26 kv, xa = 0.15 p.u., X2 = 0.15 p.u. and X, = 0.1 p.u. G3:400 MVA, 13.8 kv, x, = 0.2 p.u., x2 = 0.2 p.u. and x...
2. A single-line diagram of the power system considered is shown in Figure P2a, where negative- and zero-sequence reactances are also given. The neutrals of the generator and A-Y transformers are solidly grounded. The motor neutral is grounded through a reactance Xn = 0.05 per unit on the motor base. The per-unit zero-, positive and negative-sequence networks on a 100-MVA is shown in Figure P26, 13.8-kV base in the zone of the generator. a. Reduce the sequence networks to their...
QUESTION 4. A single-line diagram of a power system is shown in Figure Q3 below, where negative and zero-sequence reactances are also given. The neutrals of the generator and A-Y transformers are solidly grounded. The motor neutral is grounded through a reactance X.=0.05 per unit on the motor base. Prefault voltage is VF1.05<Oº per unit whereas prefault load current is zero. Take A-Y transformer phase shifts into consideration. M Line tool X, - X2 - 200 100 MVA X =...
The positive and zero sequence networks of a 3-bus power system are shown below:Determine the fault current on each phase for each of the following faults: a) Solid 3-phase fault at bus 3 b) LG fault at bus 3 (on phase A) c) LL fault at bus 3 (on phases B and C) d) LLG fault at bus 3 (on phases B and C)
3.13 A single-line diagram of a three-phase power system is shown in Fig. 3.51. The ratings of the equipment are shown below Generator G: 100 MVA, 11 kV, Xi -X2-0.20 pu, Xo -0.05 pu Generator G2 : 100 MVA, 20 kV, Xi=X2=0.25 pu, Xo=0.03 pu, X,,-0.05 pu Transformer T: 100 MVA, 11/66 kV, Xi -X2-Xo 0.06 pu Transformer T2: 100 MVA, 11/66 kV, Xi-X2 = Xo 0.06 pu Line: 100 MVA, X,-X2 = 0.15 pu, Xo = 0.65 pu A...
Four-bus power system shown in Fig. 1 are as follows: Generator G1: 200 MVA, 7.2 kv, X -0.15 p.u Generator G2: 250 MVA, 9.6 kV, X-0.12 p.u Generator G3: 500 MVA, 10 kV, X-0.25 p.u Transformer T1:200 MVA, 7.2 Δ /132 Y kV, X= 0.05 p.u Transformer T2: 250 MVA, 9.6 Δ /132 Y kV, X =0.15 p.u Transformer T3: 500 MVA, 10 Δ /132 Y kV, x-0.1 p.u Each 132-kV line:X,-10 Ω 1- A three-phase short circuit occurs at...
Please show all the clearly step Y11 ist j30 and Y44 isnt -j12.85 Consider the 4-bus power system shown in Fig. 1. The system parameters are given below: 50 MVA, 20 kV, X-2090 40 MVA, 20 kV, X-20%, X, = 5% 50 MVA, 20 kV Δ /110 kV Ý, X= 1090 50 MVA, 20 kV MI 10 kV Ý, X= 10% Xi-24.2 Ω Generator G: Motor M: Transformer T1 : Transformer T2 : Transmission line: 3 4 T2 nu)M Fig....
Question 4 The power system shown is supplying a balanced wye-grounded resistive load that consumes the MW at 1.1 kV. An SLG fault occurs at bus 3. Determine the fault current and the voltages at the fault point. Assume that the fault resistance is 6.6 2. The equipment parameters are shown in the figure. 3 4 2 (1 (1 + j5) 2 10 MW Tuto 20 MVA 22/1.1 kV X = X2 = Xo = 0.05 pu Generator 30 MVA...