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The one-line diagram of a power system is given below. Draw the impedance diagram of the...
The one-line diagram of a simple power system is shown in Figure 1. The neutral of...
The one-line diagram of a simple power system is shown in Figure 1. The neutral of each generator is grounded through a current-limiting reactor of 0.25/3 per unit on a 100-MVA base. The system data expressed in per unit on a common 100-MVA base is tabulated below. The generators are running on no-load at their rated voltage and rated frequency with their emfs in phase. Determine the fault current for the following faults giving Zo = 0.35, Z = 0.22...
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...
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...
PROBLEM 5 (20 pts]: Draw an impedance diagram for the electric power system given in the...
PROBLEM 5 (20 pts]: Draw an impedance diagram for the electric power system given in the Figure 4 showing all impedances in per unit on a 100MVA base. Choose 20/200 kV as the voltage base. If there is a three-phase to ground solid fault at the load bus, what will be fault current taken from generator 1. The three-phase power and line-line ratings are given below. Gl: 90 MVA, 20 kV, X = 9%; TR1: 80 MVA, 20/200 kV, X...
(POWER SYSTEM ANALYSIS) Load + Load Figure 1. One line diagram of a three bus power...
(POWER SYSTEM ANALYSIS) Load + Load Figure 1. One line diagram of a three bus power transmission system. In Figure 1, the power flows in the transmission lines are to be found. In this system, 100 MVA and 154 kV are the base values. The generator bus, which is shown as Bus 1, is considered to be an infinite bus and the voltage magnitude and the angle are 1 and 0°, respectively. The voltages of Bus 2 and Bus 3...
1. For the following three-phase network, draw the positive sequence diagram and the zero sequenc...
1. For the following three-phase network, draw the positive sequence diagram and the zero sequence diagram. Choose a system base of 120 MVA, 154 KV in the L1 portion of the system. Next, find the thevenin impedance at Bus A (in pu) for both the positive sequence and zero sequence diagrams G 1: 1 3.2KV, 80 MVA, XI-X2-9%, X0-6%, xn-4% on gen rating T1: 1 3.8KV delta/161 KV Wye, 60 MVA, X-9% T1 Bus A L1 G1 Xn
1. For...
3.13 A single-line diagram of a three-phase power system is shown in Fig. 3.51. The ratings...
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...
The diagram shows one phase of a 3-phase generation and distribution system. We would like to...
The diagram shows one phase of a 3-phase generation and
distribution system. We would like to determine the 12 kV short
circuit (maximum) current at the indicated location attributed to
the generation, in the event of a fault.
For this question, we work in the per unit pu system.
a. We pick S(base)=100 MVA, and V(base) = 12 kV. Then I(base)
and Z(base) are fixed. The 12 kV of the transformer secondary is
line-neutral voltage since this is a grounded...
Question 4 The power system shown is supplying a balanced wye-grounded resistive load that consumes the...
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...
Al power system is shown in the diagram below. A phase A-C fault occurs just before the A radi tr...
al power system is shown in the diagram below. A phase A-C fault occurs just before the A radi transmission line. Calculate the per-unit fault c pu. urrent in phases A and C. The fault impedance is O.001 Yg Ye TLine Load 0.1j 11kv/66kv x(+)-0.04j x()-0.04i 11 kv Kg(-)-005i Use Sbase 10 MVA. All impedances are given in pu and on 10 MVA base.
al power system is shown in the diagram below. A phase A-C fault occurs just before...
The single line diagram of a simple power system is shown in Figure 1. The system...
The single line diagram of a simple power system is shown in Figure 1. The system data are given in the table below. Choose a base power of 100 MVA and a base voltage of 132kV in Line4. Draw the impedance diagram of the system. Calculate and mark all impedances in pu on the diagram. Calculate the line to line voltage of Bus 3 in pu and in kV if the motor draws its rated power at rated voltage and...
The one-line diagram of a simple power system is shown in Figure 1. The neutral of each generator is grounded through a current-limiting reactor of 0.25/3 per unit on a 100-MVA base. The system data expressed in per unit on a common 100-MVA base is tabulated below. The generators are running on no-load at their rated voltage and rated frequency with their emfs in phase. Determine the fault current for the following faults giving Zo = 0.35, Z = 0.22...
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...
PROBLEM 5 (20 pts]: Draw an impedance diagram for the electric power system given in the Figure 4 showing all impedances in per unit on a 100MVA base. Choose 20/200 kV as the voltage base. If there is a three-phase to ground solid fault at the load bus, what will be fault current taken from generator 1. The three-phase power and line-line ratings are given below. Gl: 90 MVA, 20 kV, X = 9%; TR1: 80 MVA, 20/200 kV, X...
(POWER SYSTEM ANALYSIS) Load + Load Figure 1. One line diagram of a three bus power transmission system. In Figure 1, the power flows in the transmission lines are to be found. In this system, 100 MVA and 154 kV are the base values. The generator bus, which is shown as Bus 1, is considered to be an infinite bus and the voltage magnitude and the angle are 1 and 0°, respectively. The voltages of Bus 2 and Bus 3...
1. For the following three-phase network, draw the positive sequence diagram and the zero sequence diagram. Choose a system base of 120 MVA, 154 KV in the L1 portion of the system. Next, find the thevenin impedance at Bus A (in pu) for both the positive sequence and zero sequence diagrams G 1: 1 3.2KV, 80 MVA, XI-X2-9%, X0-6%, xn-4% on gen rating T1: 1 3.8KV delta/161 KV Wye, 60 MVA, X-9% T1 Bus A L1 G1 Xn
1. For...
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...
The diagram shows one phase of a 3-phase generation and
distribution system. We would like to determine the 12 kV short
circuit (maximum) current at the indicated location attributed to
the generation, in the event of a fault.
For this question, we work in the per unit pu system.
a. We pick S(base)=100 MVA, and V(base) = 12 kV. Then I(base)
and Z(base) are fixed. The 12 kV of the transformer secondary is
line-neutral voltage since this is a grounded...
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...
al power system is shown in the diagram below. A phase A-C fault occurs just before the A radi transmission line. Calculate the per-unit fault c pu. urrent in phases A and C. The fault impedance is O.001 Yg Ye TLine Load 0.1j 11kv/66kv x(+)-0.04j x()-0.04i 11 kv Kg(-)-005i Use Sbase 10 MVA. All impedances are given in pu and on 10 MVA base.
al power system is shown in the diagram below. A phase A-C fault occurs just before...
The single line diagram of a simple power system is shown in Figure 1. The system data are given in the table below. Choose a base power of 100 MVA and a base voltage of 132kV in Line4. Draw the impedance diagram of the system. Calculate and mark all impedances in pu on the diagram. Calculate the line to line voltage of Bus 3 in pu and in kV if the motor draws its rated power at rated voltage and...
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