1. Define briefly: (a) the fault level of a system or unit in a system (b)...
1. Define briefly:
(a) the fault level of a system or unit in a system
(b) base MVA.
State:
(c) the equation for percentage impedance or impedance
voltage
(d) the relationship between X% and X pu
(e) the units of X% and X pu
(f) X pu in terms of the fault level MVA and the base MVA.
Homework Answers
Add Answer to:
1. Define briefly:
(a) the fault level of a system or unit in a system
(b)...
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 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...
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...
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 ...
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...
Single line to ground fault analysis Example 9.4 Problem 1 A three-phase, il kV, 30 MVA alternato...
I need help in matlab codes please
Single line to ground fault analysis Example 9.4 Problem 1 A three-phase, il kV, 30 MVA alternator with grounded neutral has a direct axis subtransien pu respectively based on system base. A single line to ground fault has occurred in phase a. Determine the fault current, line to ground voltages in pu. t, negative sequence and zero sequence reactances of 0.2 pu, 0.3 pu and 0.1 Solution: Phase voltage E.0 pu From equation...
6. (i) For the system shown in FIGURE 4, determine the fault level for a fault on the cable at the 3.3 kV unit shown when the bus section switch is closed. The cable impedance is 90 microhms per metr...
6. (i) For the system shown in FIGURE 4, determine the fault level for a fault on the cable at the 3.3 kV unit shown when the bus section switch is closed. The cable impedance is 90 microhms per metre. Neglect cable resistance and use a base of 10 MVA ii) What would be the effect on the fault level of replacing the unit shown in FIGURE 4 with a running motor? 8 MW08 pf G ( G ) =...
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 ...
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...
For the system below compute the fault current and the branch contributions for a three phase...
For the system below compute the fault current and the
branch contributions for a three phase fault.
consider the unloaded system with a pre-fault voltage
of 1.1 pu.
Compute the fault current and the total current of
each branch. Show all calculations and tabulate the final
result.
For the system below compute the fault current and the branch contributions for a three-phase fault. Considerthe unloaded system with a pre-fault voltage 1.1 pu. Compute the fault current and the total current...
Problem 2 (10 pts) 132 kV TL 40 km 1 pu mid-point L-E fault 60 ΛΤΑ TL: Transmission line. L-E fault: Line-to-earth fault. Z. 0.07 pu 0.1 pu Generator 0.1 pu 0.1 pu 0.1 pu Transformers 2.5x Z] Transmi...
Problem 2 (10 pts) 132 kV TL 40 km 1 pu mid-point L-E fault 60 ΛΤΑ TL: Transmission line. L-E fault: Line-to-earth fault. Z. 0.07 pu 0.1 pu Generator 0.1 pu 0.1 pu 0.1 pu Transformers 2.5x Z] Transmission Line 0.7 Ω/km 0.7 Ω/km Suppose a single L-E fault happens at the mid-point of the transmission line. Determine the per unit phase voltage and current at point P (Choose Sbase-60 MVA and Vbase-132 kV). (4 pts) * The phase impedance...
Bus A Bus B R1 T1 line 1 20% 80% line 2 T2 R2 110 kV 11 kV The fault is located at point F, which...
Bus A Bus B R1 T1 line 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...
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 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...
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...
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...
I need help in matlab codes please
Single line to ground fault analysis Example 9.4 Problem 1 A three-phase, il kV, 30 MVA alternator with grounded neutral has a direct axis subtransien pu respectively based on system base. A single line to ground fault has occurred in phase a. Determine the fault current, line to ground voltages in pu. t, negative sequence and zero sequence reactances of 0.2 pu, 0.3 pu and 0.1 Solution: Phase voltage E.0 pu From equation...
6. (i) For the system shown in FIGURE 4, determine the fault level for a fault on the cable at the 3.3 kV unit shown when the bus section switch is closed. The cable impedance is 90 microhms per metre. Neglect cable resistance and use a base of 10 MVA ii) What would be the effect on the fault level of replacing the unit shown in FIGURE 4 with a running motor? 8 MW08 pf G ( G ) =...
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...
For the system below compute the fault current and the
branch contributions for a three phase fault.
consider the unloaded system with a pre-fault voltage
of 1.1 pu.
Compute the fault current and the total current of
each branch. Show all calculations and tabulate the final
result.
For the system below compute the fault current and the branch contributions for a three-phase fault. Considerthe unloaded system with a pre-fault voltage 1.1 pu. Compute the fault current and the total current...
Problem 2 (10 pts) 132 kV TL 40 km 1 pu mid-point L-E fault 60 ΛΤΑ TL: Transmission line. L-E fault: Line-to-earth fault. Z. 0.07 pu 0.1 pu Generator 0.1 pu 0.1 pu 0.1 pu Transformers 2.5x Z] Transmission Line 0.7 Ω/km 0.7 Ω/km Suppose a single L-E fault happens at the mid-point of the transmission line. Determine the per unit phase voltage and current at point P (Choose Sbase-60 MVA and Vbase-132 kV). (4 pts) * The phase impedance...
Bus A Bus B R1 T1 line 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...
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