A A 13.8 kV, three-phase bus is supplied from a solidly grounded system with an effective...
A
A 13.8 kV, three-phase bus is supplied from a solidly grounded system with an effective reactance of 0.4 Ohm. A 5.4 MVA capacitor bank is connected to a bus. During switching operation to disconnect the capacitor from the bus, the switch reignites, the reignite ion occurring when the voltage across the switch is 18 kV. What will be the peak value of the reignition current? What voltage will be left trapped on the capacitor if this reignition current is interrupted? At its first current zero? At its second current zero? If following (a), a second reignition occurs exactly half a cycle after the first, what would then be the peak transient voltage appearing on the capacitor? Note: supply voltage is of the form vs(t) = Vs * sqrt(2) * cos(wt)
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A 13.8 kV, three-phase bus is supplied from a solidly grounded
system with an effective...
5.3 A 13.8 kV, three-phase bus is supplied from a solidly grounded system with an effective reactance of 0.4. A 5.4 MVA capacitor bank is connected to the bus. During switching operation to disconnec...
5.3 A 13.8 kV, three-phase bus is supplied from a solidly grounded system with an effective reactance of 0.4. A 5.4 MVA capacitor bank is connected to the bus. During switching operation to disconnect the capacitor from the bus, the switch reignites, the reignition occurring when the voltage across the switch is 18 kV. What wil be the peak value of the reignition current? What voltage will be left trapped on the capacitor if this reignition current is interrupted? PROBLEMS...
3. A 200 MVA, 20 kV, 60 Hz Y-connected solidly grounded three phase synchronous generator connect...
3. A 200 MVA, 20 kV, 60 Hz Y-connected solidly grounded three phase synchronous generator connected through a 200 MVA 20/138 KV Y-Y transformer to a 138 kV transmission line. The generator reactances to the machine's own base are X-1.10 Both of the transformers Y connections are solidly grounded and its positive, negative and zero sequence series resitances are all 0.10 pu. a. What is the voltage at the terminals of the generator during the sub transient period if a...
4. A generator having a solidly grounded neutral and rated 50-MVA, 30-kV has positive, negative-, and...
4. A generator having a solidly grounded neutral and rated 50-MVA, 30-kV has positive, negative-, and zero-sequence reactances of 35, 25, and 5 percent, respectively (a) What reactance must be placed in the generator neutral to limit the fault current for a bolted line-to-ground fault to that for a bolted three-phase fault? (b) What reactance must be placed in the generator neutral to limit the fault current for a bolted double line-to-ground fault to that for a bolted three-phase fault?
QUESTION 4. A single-line diagram of a power system is shown in Figure Q3 below, where...
QUESTION 4. A single-line diagram of a power system is shown in Figure Q3 below, 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 X.=0.05 per unit on the motor base. Prefault voltage is VF1.05<Oº per unit whereas prefault load current is zero. Take A-Y transformer phase shifts into consideration. M Line tool X, - X2 - 200 100 MVA X =...
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 #2 An industrial system bus is fed from an infinite bus thru a 150 MVA, 115kV/38kV, X=5% substation connected to a 75 MVA, 38kV/13.8kV, X-6.5% substation. A 25 MW, 13.8 kV, pf=.85, 3-phase...
Problem #2 An industrial system bus is fed from an infinite bus thru a 150 MVA, 115kV/38kV, X=5% substation connected to a 75 MVA, 38kV/13.8kV, X-6.5% substation. A 25 MW, 13.8 kV, pf=.85, 3-phase, x=16% diesel generator is also connected to the industrial system bus. Several feeders are connected to the 38kV bus. If a fault occurs in one of such feeders, plot sag voltage at the 13.8kV bus vs. distance to fault with and without the generator contribution. The...
2. A three-phase short circuit occurs at the bus 1 for the system shown in figure...
2. A three-phase short circuit occurs at the bus 1 for the system shown in figure below. Neglecting prefault currents and assuming that the generator is operating at its rated voltage, determine the subtransient fault current using superposition. bus 1 bus 2 j6522 ww m AY 25 MVA 13.8 kV 15% 25 MVA 13.2/69 KV 11% 25 MVA 69/13.2 kV 11% 15 MVA 13 kV 15%
a five bus system
The equipment ratings for a five bus system are given as Generator G1: 50 MVA, 12 kV, Xd
’’=X2=0.20, X0= 0.10 per unit Generator G2: 100 MVA, 15 kV, Xd
’’=0.2, X2=0.23, X0= 0.10 per unit Transformer T1: 50 MVA, 10 kV (Y)/138 kV (Y), X=0.10 per unit Transformer T1: 100 MVA, 15 kV (∆)/138 kV (Y), X=0.10 per unit Each 138 kV line: X1=40 Ohms, X0=100 ohms (1) Draw out the zero-, positive-, and negative- sequence reactance diagrams for the original system
using a 100-MVA,...
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...
Problem 2. [20 PT] A 25 MVA, three phase, 13.8 KV, A-connected, two pole, 60 Hz...
Problem 2. [20 PT] A 25 MVA, three phase, 13.8 KV, A-connected, two pole, 60 Hz synchronous generator was tested by open circuit and short circuit tests and following data was collected. Neglect the stator resistance for this question: Open Circuit Characteristics Line Voltage, KV 13.0 13.8 15.2 16.0 Field Current, A 320 365 380 475 570 14.1 Short Circuit Characteristics Field Current, A 320 Armature Current, A 1046 365 380 475 570 1190 1240 1550 1885 Compute a) [10...
5.3 A 13.8 kV, three-phase bus is supplied from a solidly grounded system with an effective reactance of 0.4. A 5.4 MVA capacitor bank is connected to the bus. During switching operation to disconnect the capacitor from the bus, the switch reignites, the reignition occurring when the voltage across the switch is 18 kV. What wil be the peak value of the reignition current? What voltage will be left trapped on the capacitor if this reignition current is interrupted? PROBLEMS...
3. A 200 MVA, 20 kV, 60 Hz Y-connected solidly grounded three phase synchronous generator connected through a 200 MVA 20/138 KV Y-Y transformer to a 138 kV transmission line. The generator reactances to the machine's own base are X-1.10 Both of the transformers Y connections are solidly grounded and its positive, negative and zero sequence series resitances are all 0.10 pu. a. What is the voltage at the terminals of the generator during the sub transient period if a...
4. A generator having a solidly grounded neutral and rated 50-MVA, 30-kV has positive, negative-, and zero-sequence reactances of 35, 25, and 5 percent, respectively (a) What reactance must be placed in the generator neutral to limit the fault current for a bolted line-to-ground fault to that for a bolted three-phase fault? (b) What reactance must be placed in the generator neutral to limit the fault current for a bolted double line-to-ground fault to that for a bolted three-phase fault?
QUESTION 4. A single-line diagram of a power system is shown in Figure Q3 below, 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 X.=0.05 per unit on the motor base. Prefault voltage is VF1.05<Oº per unit whereas prefault load current is zero. Take A-Y transformer phase shifts into consideration. M Line tool X, - X2 - 200 100 MVA X =...
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 #2 An industrial system bus is fed from an infinite bus thru a 150 MVA, 115kV/38kV, X=5% substation connected to a 75 MVA, 38kV/13.8kV, X-6.5% substation. A 25 MW, 13.8 kV, pf=.85, 3-phase, x=16% diesel generator is also connected to the industrial system bus. Several feeders are connected to the 38kV bus. If a fault occurs in one of such feeders, plot sag voltage at the 13.8kV bus vs. distance to fault with and without the generator contribution. The...
2. A three-phase short circuit occurs at the bus 1 for the system shown in figure below. Neglecting prefault currents and assuming that the generator is operating at its rated voltage, determine the subtransient fault current using superposition. bus 1 bus 2 j6522 ww m AY 25 MVA 13.8 kV 15% 25 MVA 13.2/69 KV 11% 25 MVA 69/13.2 kV 11% 15 MVA 13 kV 15%
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...
Problem 2. [20 PT] A 25 MVA, three phase, 13.8 KV, A-connected, two pole, 60 Hz synchronous generator was tested by open circuit and short circuit tests and following data was collected. Neglect the stator resistance for this question: Open Circuit Characteristics Line Voltage, KV 13.0 13.8 15.2 16.0 Field Current, A 320 365 380 475 570 14.1 Short Circuit Characteristics Field Current, A 320 Armature Current, A 1046 365 380 475 570 1190 1240 1550 1885 Compute a) [10...
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