Discuss the consequences of short circuit faults on electric power systems.
a- Discuss the consequences of short circuit faults on an electric power systems (5 points)
b- Protective schemes are routinely used for electric power transformers. Name at least three different types of transformer protective schemes (by function) and explain briefly their principles of operation. (5 points)
Consider the system shown in the single-line diagram of Figure 3. All reactances are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u.
c- Find the fault current due to a bolted-three-phase short circuit in the middle of line 1- 3. [5 points)
d- Find the voltages at buses 1 and 2 under the fault conditions of part c above [5 points)
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Discuss the consequences of short circuit faults on electric power systems.
PROBLEM 5 a Discuss the consequences of short circuit faults on electric power systems [5 Points...
PROBLEM 5 a Discuss the consequences of short circuit faults on electric power systems [5 Points Protective schemes are routinely used for electric power transformers. Name at least three different types of transformer protective schemes (by function) and explain briefly their principles of operation. [5 Points] Consider the system shown in the single-line diagram of Figure (4 per unit to the same base. Assume that the voltage at both sources is 1 p.u .) All reactances are shown in ind...
Consider the system shown in the single-line diagram of Figure 3. All reactances are shown in...
Consider the system shown in the single-line diagram of Figure 3. All reactances are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u. c- Find the fault current due to a bolted-three-phase short circuit in the middle of line 1- 3. [5 points d- Find the voltages at buses 1 and 2 under the fault conditions of part c above [5 points] 0.225 pu. 0.035 pu. 0.2p.u ? 0.15 p.u. 0.215...
Consider the system shown in the single-line diagram of Figure 3. All reactances are shown in...
Consider the system shown in the single-line diagram of Figure 3. All reactances are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u. a- Find the fault current due to a bolted- three-phase short circuit at bus 3. [10 points] b- Find the fault current supplied by each generator and the voltage at each of the buses 1 and 2 under fault conditions. [10 points] 0.1 p.u 0.06 ?.u. 0.25 p.11....
Question3 3000 kVA / 0.09 p.u. Alternators 2 40004VA 0.12 p.u 6kV Busbars 4000 LVA 0.05 p.. Transmission Lines Lin...
Question3 3000 kVA / 0.09 p.u. Alternators 2 40004VA 0.12 p.u 6kV Busbars 4000 LVA 0.05 p.. Transmission Lines Lines 4000 kV 0.05 p.ย. Step-Up Transformers 5000 kVA 5000 kVA 0.06 р.u. 0.06 p.u. 11 kV Basbars -150 kVA 0.05 pu. Secondary feeder line Step-Down 1500 kVA 0.03 p.u 415 V Busbars Fault Point Figure Q3 Figure Q3 shows a power system comprising two three phase alternators supplying 6 kV busbars. I wo paralilel transmission lines fed from these busbars...
Consider the system Shown in the single-line diagram of Figure (3). All reactance are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u.
Consider the system shown in the single-line diagram of Figure (3). All reactances are shown in per unit to the same base. Assume that the voltage at both sources is \(1 \mathrm{p}\).u.
a- Find the fault current due to a bolted- three-phase short circuit at bus \(3 .[10\) points \(]\)
b- Find the fault current supplied by each generator and the voltage at each of the buses 1 and 2 under fault conditions. \([10\) points \(]\)
Explain the reasons for applying system grounding in electric power systems.
Explain the reasons for applying system grounding in electric power systems. [4 points]
Consider the industrial plant distribution bus which is scpplied by a utility source with per-unit sequence reactances as shown in Figure (4-a). Assume that all reactances are given on a \(5,000-\mathrm{kVA}\) base, and that the plant"s bus voltage is \(4,160-\mathrm{V}\).
b- Determine the fault current for a single line to ground fault on phase A of the bus. \([4\) points]
Assume now that an ungrounded \(5,000 \mathrm{kVA}\)...
By MATLAB Code: Assume all emf = 1 p.u. ALL Faults happen at BUS 6:
By MATLAB Code:
Assume all emf = 1 p.u.
ALL Faults happen at BUS 6:
Step 3: Carry out symmetrical fault analysis at bus 6 showing the fault current, bus voltages and line currents during the fault. Step 4: Repeat step 3 with single-line-to-ground fault. Step 5: Repeat step 3 with line-to-line fault Step 6: Repeat step 3 with double-line-to-ground fault. We were unable to transcribe this imageLine & Transformer Data Generator Data From To X-XX 4 0.225 0.400 5...
Power system operation and control
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...
Problem 7 Consider the circuit shown in Figure (4.) Assume that E 1.2 p.u. and V 1.00 p.u. where a three-phase fault takes place at the point F as shown. The fault is cleared by opening the faulted l...
Problem 7 Consider the circuit shown in Figure (4.) Assume that E 1.2 p.u. and V 1.00 p.u. where a three-phase fault takes place at the point F as shown. The fault is cleared by opening the faulted line. a Find the initial power angle when the active component of the load on the circuit is 1 p.u. b Find the power angle curve, during the fault. [5 points] c Find the post fault power angle curve. [5 points] [5...
Consider the circuit as shown. Assume that E = 1.25 p.u. and V = 1.00 p.u. (You can assume that the transient reactance of the generator is j 0.03 pu.)
Consider the circuit as shown. Assume that E=1.25 p.u. and V=1.00 p.u. (You can assume that the transient reactance of the generator is j 0.03 pu.)
a) Find the initial power angle \(\delta\) when the active component of the load on the circuit is 2.8 p.u. [5 marks]
b) A three-phase short circuit takes place in the middle of transmission line 3 . Determine whether the system will remain stable or not when the fault is sustained (i.e., a permanent...
PROBLEM 5 a Discuss the consequences of short circuit faults on electric power systems [5 Points Protective schemes are routinely used for electric power transformers. Name at least three different types of transformer protective schemes (by function) and explain briefly their principles of operation. [5 Points] Consider the system shown in the single-line diagram of Figure (4 per unit to the same base. Assume that the voltage at both sources is 1 p.u .) All reactances are shown in ind...
Consider the system shown in the single-line diagram of Figure 3. All reactances are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u. c- Find the fault current due to a bolted-three-phase short circuit in the middle of line 1- 3. [5 points d- Find the voltages at buses 1 and 2 under the fault conditions of part c above [5 points] 0.225 pu. 0.035 pu. 0.2p.u ? 0.15 p.u. 0.215...
Consider the system shown in the single-line diagram of Figure 3. All reactances are shown in per unit to the same base. Assume that the voltage at both sources is 1 p.u. a- Find the fault current due to a bolted- three-phase short circuit at bus 3. [10 points] b- Find the fault current supplied by each generator and the voltage at each of the buses 1 and 2 under fault conditions. [10 points] 0.1 p.u 0.06 ?.u. 0.25 p.11....
Question3 3000 kVA / 0.09 p.u. Alternators 2 40004VA 0.12 p.u 6kV Busbars 4000 LVA 0.05 p.. Transmission Lines Lines 4000 kV 0.05 p.ย. Step-Up Transformers 5000 kVA 5000 kVA 0.06 р.u. 0.06 p.u. 11 kV Basbars -150 kVA 0.05 pu. Secondary feeder line Step-Down 1500 kVA 0.03 p.u 415 V Busbars Fault Point Figure Q3 Figure Q3 shows a power system comprising two three phase alternators supplying 6 kV busbars. I wo paralilel transmission lines fed from these busbars...
By MATLAB Code:
Assume all emf = 1 p.u.
ALL Faults happen at BUS 6:
Step 3: Carry out symmetrical fault analysis at bus 6 showing the fault current, bus voltages and line currents during the fault. Step 4: Repeat step 3 with single-line-to-ground fault. Step 5: Repeat step 3 with line-to-line fault Step 6: Repeat step 3 with double-line-to-ground fault. We were unable to transcribe this imageLine & Transformer Data Generator Data From To X-XX 4 0.225 0.400 5...
Problem 7 Consider the circuit shown in Figure (4.) Assume that E 1.2 p.u. and V 1.00 p.u. where a three-phase fault takes place at the point F as shown. The fault is cleared by opening the faulted line. a Find the initial power angle when the active component of the load on the circuit is 1 p.u. b Find the power angle curve, during the fault. [5 points] c Find the post fault power angle curve. [5 points] [5...
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