The positive-sequence reactances for the power system shown in Figure 10.31 are in per unit on a common MVA base. Resistances are neglected and the negative-sequence impedances are assumed to be the same as the positive-sequence impedances. A bolted line-to-line fault occurs between phases b and c at bus 2.
Before the fault occurrence, all bus voltages are 1.0 per unit. Obtain the positive-sequence bus impedance matrix.
Find the fault current, the three-phase bus voltages during fault, and the line currents in each phase.
(a) Use hand calculation
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can you calculating this question and explain why? thanks The ratings and sequence reactances of the components for the power system shown in Figure 2 are given in Table 1. The pre-fault voltage is 1/0° per unit (pu). Bus 8 L3 Bus 1 T1 Bus 4 T2 Bus 2 Bus 5 L1 L2 G1 Bus 3 T3 Bus 7 Bus 6 D.6975 Figure Draw the per unit impedance sequence networks and determine the per unit (a) Thevenin impedances of the...
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...
The one-line diagram of a three-bus power system is shown in Figure 4. All impedances are expressed in per unit on a common MVA base. All resistances and shunt capacitances are neglected. Information on each component in this system is given below: • Each generator is represented by an emf behind the sub-transient reactance of j0.045 and their neutrals are connected to the ground. • Line 1-2 has reactance of j0.88 • Line 2-3 has reactance of j0.65 • Line...
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...
Note: # 1 states line to line fault occurs, while # 2 states double line to ground fault occurs Please explain the solution thoroughly with diagrams The positive, negative, and zero sequence reactances of a 15-MVA, 11-kV, 3ph, wye-connected generator are 11%, 8% and 3%, respectively. The neutral of the generator is grounded, and the generator is excited to the rated voltage on open circuit. A line-to-line fault occurs between phases b and c of the generator while phase a...
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...
Consider the 3-bus power system single diagram below. A bolted three phase fault occurs at bus 3. Using bus impedance matrix calculate the following: 1 j0,2 j0,5 0,3 A2 2 3 A3 j0,3 0,6 j0,2 1.1 1.2 1.3 Fault current Bus voltages Line currents during the fault.
QUESTION 1: Consider the 3-bus power system single diagram below. A bolted three phase fault occurs at bus 3. Using bus impedance matrix calculate the following: j0,2 j0,5 0,3 A2 2 3 A3 0,3 j0,6 j0,2 1.1 Fault current Bus voltages Line currents during the fault. 1.3
Bus A Bus B R1 TI ine 1 20% 80% line 2 T2 R2 110 kV 11 kV The fault is located at point F, which is 20% of the total line 2 length from Bus B Fault MVA 1524.20471 Three-phase fault level in MVA at bus A SPFL (kA) 8 MVA1 MVA2 X1 (96 X2 (96) R1 (2) R2 (Q) z' (Q) Zo (2) Rf (Q) Single phase to ground fault level (kA) at bus A Transformer 1 MVA...
The zero-, positive-, and negative-sequence bus impedance matrices for a three bus power system are given below 5. T0.10 0.15 0.121 Bu0.15 0.10 0.08 pu [0.16 0.10 0.15] Lo.15 0.14 0.30 0.12 0.08 0.35 ZBus ZBus0.10 0.20 0.14 pu Determine the per unit fault current and the bus voltages during fault for (a) A bolted three-phase fault at bus 2. (b) A bolted single line-to-ground fault at bus 2. (c) A bolted line-to-line fault at bus 2 (d) A bolted...