Consider the system of Figure(4) The reactances of all components in p.u, are indicated in Table (2)
Consider the system of Figure (4) The reactances of all components in p.u. are indicated in Table (2)
a- Sketch and label carefully the positive, negative, and zero sequence equivalent networks for this system including the switch S. Note that the switch is normally closed when the high voltage side of the transformer is grounded. An open switch means a broken ground connection. 15 Points)
b. Assume that a double line to ground fault takes place on phases B and C at bus 2, while switch S is closed. Find the current through phase B of line L1. [10 Points)
c- Repeat part (b) with the switch open (ungrounded transformer T1.) What is the effect of grounding the transformer on the fault current? (10 Points)
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Consider the system of Figure(4) The reactances of all components in p.u, are indicated in Table (2)
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 \(5,000 \mathrm{kVA}\)...
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....
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...
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...
can you calculating this question and explain why? thanks The ratings and sequence reactances of the components for...
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...
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...
The positive, negative and zero-sequence reactances of a 20-MVA, 13.2 kV synchronous generator are 0.3 pu,...
The positive, negative and zero-sequence reactances of a 20-MVA, 13.2 kV synchronous generator are 0.3 pu, 0.2 pu, and 0.1 pu respectively. The generator is solidly grounded and is not loaded. If a double line-to-ground fault occurs at the generator terminals, calculate: (i) The fault current (ii) The line voltages (iii) Explain the steps that was carried out in the sequence voltage changes at all buses of the system. (Do include explanations and analysis of your solutions such as use...
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...
(10 points) For the power system shown below, sketch the sequence circuit connections for a 02,...
(10 points) For the power system shown below, sketch the sequence circuit connections for a 02, phase A to ground fault at bus B, and develop the equation for calculating the fault current in sequence coordinates. The sequence impedances of the generator and transformer are shown in the figure. T1 B (GENHH OH SLG FAULT Generator: Zs1 = Zs2, Zso, Y-grounded T1: Zy1 = Z12 = Zto, Delta-Wye Grounded Fault: Phase A to Ground, Z = 0
2. A single-line diagram of the power system considered is shown in Figure P2a, where negative-...
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...
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....
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...
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...
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...
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...
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...
(10 points) For the power system shown below, sketch the sequence circuit connections for a 02, phase A to ground fault at bus B, and develop the equation for calculating the fault current in sequence coordinates. The sequence impedances of the generator and transformer are shown in the figure. T1 B (GENHH OH SLG FAULT Generator: Zs1 = Zs2, Zso, Y-grounded T1: Zy1 = Z12 = Zto, Delta-Wye Grounded Fault: Phase A to Ground, Z = 0
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...
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