A 60-Hz turbo generator is rated 500 MVA, 22 kV. It is Y-connected and solidly grounded...
A 60-Hz turbo generator is rated 500 MVA, 22 kV. It is Y-connected and solidly grounded at rated voltage at no-load. It is disconnected from the rest of the system. Its reactances are X1=X2= 0.15 and X0= 0.05 per unit. Find the ratio of the subtransient line current for line-to-line fault to the subtransient current for a symmetrical 3 phase fault.
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A 60-Hz turbo generator is rated 500 MVA, 22 kV. It is
Y-connected and solidly grounded...
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?
A 300-MVA, 13.8-KV, three-phase, 60-Hz, Y-connected synchronous generator is adjusted to produce rated voltage on open...
A 300-MVA, 13.8-KV, three-phase, 60-Hz, Y-connected synchronous generator is adjusted to produce rated voltage on open circuit. A bal- anced three-phase fault is applied to the terminals at t = 0. After analyz- ing the raw data, the symmetrical transient current is obtained as 1 S.S. trans. iae(t) = 10(i + e 1/200 + 6e-1/15). sin ( 1 (a) Sketch inc(t) as a function of time for 0 st s 500 ms. (b) Determine X]" and X, in per unit...
1. A three-phase synchronous generator connected to a 345-KV transmission line through a transformer as shown...
1. A three-phase synchronous generator connected to a 345-KV transmission line through a transformer as shown in Figure P1. Parameters of both generator and transformer are given in the figure. Transformer losses and exciting current are neglected. A three-phase short-circuit occurs on the line side of the circuit breaker when the generator is operated at rated terminal voltage and at no-load. The breaker interrupts the fault three cycles after fault inception. Neglect the effect of the transformer on the time...
The following are the answers: Autumn 2013 T1 G1 5 kV 50 MVA 5/20 kV 50...
The following are the answers:
Autumn 2013 T1 G1 5 kV 50 MVA 5/20 kV 50 MVA 20 kV 50 MVA X 0.1 p.u Figure A13 In the system shown, per-unit series equivalent impedances are shown for each element. Before a balanced 3-phase fault occurs in the location shown, the pre-fault current is at its rated value at 90 % lagging power factor flowing from generator G1 The generator is operating at full voltage. How much current in kA is...
03 Consider the following one line diagram. The generator is rated at 25 MVA, IN has...
03 Consider the following one line diagram. The generator is rated at 25 MVA, IN has subtransient reactance of 20 %. The transmission line has a reactance of 10 The subtransient reactance of motorlis 0.345 pu where is that ol second more pu. Each motor has the following ratings. 10 MVA and 11 kV. Both transformers are rated at 25 MVA and have a reactance of 8.05% each; the transformers 1 and 2 have voltage ratio of 11/121 KV and...
Diesel Generator A 1 MVA diesel three-phase generator is rated at 4.16 kV, 60 Hz, and...
Diesel Generator A 1 MVA diesel three-phase generator is rated at 4.16 kV, 60 Hz, and connected as Y its neutral is kept floating. It is directly tied to three loads, one consuming 50% of its capacity, and each of the other two consuming 25% of its capacity. A three-phase to ground fault could occur at any of the loads. Draw a one-line diagram of this system, then describe what type of faults could occur in the generator and diesel...
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...
[32] QUESTION 2 A synchronous generator and motor are rated 30MVA, 11kV and both have subtransient...
[32] QUESTION 2 A synchronous generator and motor are rated 30MVA, 11kV and both have subtransient reactances of 20% The line connecting them has a reactance of 10% on the base of the machine rating The motor is drawing 20MVA at 0 8 power factor leadıng and the terminal voltage is 10 67kV when a symmetrical three phase fault occurs at the motor terminal Find the subtransient currents (in kA) in the generator, the motor and the fault by using...
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 =...
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?
A 300-MVA, 13.8-KV, three-phase, 60-Hz, Y-connected synchronous generator is adjusted to produce rated voltage on open circuit. A bal- anced three-phase fault is applied to the terminals at t = 0. After analyz- ing the raw data, the symmetrical transient current is obtained as 1 S.S. trans. iae(t) = 10(i + e 1/200 + 6e-1/15). sin ( 1 (a) Sketch inc(t) as a function of time for 0 st s 500 ms. (b) Determine X]" and X, in per unit...
1. A three-phase synchronous generator connected to a 345-KV transmission line through a transformer as shown in Figure P1. Parameters of both generator and transformer are given in the figure. Transformer losses and exciting current are neglected. A three-phase short-circuit occurs on the line side of the circuit breaker when the generator is operated at rated terminal voltage and at no-load. The breaker interrupts the fault three cycles after fault inception. Neglect the effect of the transformer on the time...
The following are the answers:
Autumn 2013 T1 G1 5 kV 50 MVA 5/20 kV 50 MVA 20 kV 50 MVA X 0.1 p.u Figure A13 In the system shown, per-unit series equivalent impedances are shown for each element. Before a balanced 3-phase fault occurs in the location shown, the pre-fault current is at its rated value at 90 % lagging power factor flowing from generator G1 The generator is operating at full voltage. How much current in kA is...
03 Consider the following one line diagram. The generator is rated at 25 MVA, IN has subtransient reactance of 20 %. The transmission line has a reactance of 10 The subtransient reactance of motorlis 0.345 pu where is that ol second more pu. Each motor has the following ratings. 10 MVA and 11 kV. Both transformers are rated at 25 MVA and have a reactance of 8.05% each; the transformers 1 and 2 have voltage ratio of 11/121 KV and...
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...
[32] QUESTION 2 A synchronous generator and motor are rated 30MVA, 11kV and both have subtransient reactances of 20% The line connecting them has a reactance of 10% on the base of the machine rating The motor is drawing 20MVA at 0 8 power factor leadıng and the terminal voltage is 10 67kV when a symmetrical three phase fault occurs at the motor terminal Find the subtransient currents (in kA) in the generator, the motor and the fault by using...
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 =...
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