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 engine. Explain at least three types of protection strategies that have to be implemented in such a system, and show necessary fault current calculations. Assume that any fault impedance you may need is 9.02 pu, and any component impedance is 0.4 pu.
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Diesel Generator A 1 MVA diesel three-phase generator is rated
at 4.16 kV, 60 Hz, and...
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...
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.
A 3-phase, 60-Hz, synchronous generator has the following data
A 3 -phase, \(60-\mathrm{H} 2\), synchronous generator has the following data:Rated MVA \(=22.8 \mathrm{MVA}\)Rated voltage \(=13.8 \mathrm{kV}\)\(X_{d}=1.8\) pu on rated MVA and rated voltage base \(X_{d}^{\prime}=0.3\) pu on rated MVA and rated voltage base CT ratio \(=1200 \mathrm{~A}: 5 \mathrm{~A}\)PT ratio \(=14.4 \mathrm{kV}: 120 \mathrm{~V}\)a) Explain why it is important to have synchronous generator under-exciation or loss of excitation protection. [5 marks]b) Design a loss of excitation relay for this generator based on the standard single mho circle design, and...
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...
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...
Problem #2: A three-phase synchronous generator is rated 16 kV and 200 MVA, has negligible losses...
Problem #2: A three-phase synchronous generator is rated 16 kV and 200 MVA, has negligible losses and has reactance of 1.65 pu. The generator is operated on an infinite bus of 15 kV voltage and delivers 100 MVA at 0.8 Power Factor, lagging. a)Determine the internal voltage (E_i), the power angle (5), and the line current of the machine. b)If the field current of the machine is reduced by 10%, while the mechanical power input to the machine is maintained...
A 60-MVA, 69.3-kV, three-phase synchronous generator has a synchronous reactance of 15 Ω/phase and negligible armature...
A 60-MVA, 69.3-kV, three-phase synchronous generator has a synchronous reactance of 15 Ω/phase and negligible armature resistance. -a. The generator is delivering rated power at 0.8 power factor lagging at the rated terminal voltage to an infinite bus bar. Determine the magnitude of the generated emfper phase and the power angle δ. -b. If the generated emfis 36 kV per phase, what is the maximum three-phase power that the generator can deliver before losing its synchronism? Winter
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 5 A 3-phase, 22 kV (phase), 500 MVA star-connected synchronous generator has a per phase...
QUESTION 5 A 3-phase, 22 kV (phase), 500 MVA star-connected synchronous generator has a per phase reactance Xg of 1.5 pu and supplies 0.8 pu per phase real power (P) at the rated voltage, with a lagging power factor of 0.6 to the load. Find the actual excitation voltage Vo in kV (line value). 96.392
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...
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...
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...
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...
Problem #2: A three-phase synchronous generator is rated 16 kV and 200 MVA, has negligible losses and has reactance of 1.65 pu. The generator is operated on an infinite bus of 15 kV voltage and delivers 100 MVA at 0.8 Power Factor, lagging. a)Determine the internal voltage (E_i), the power angle (5), and the line current of the machine. b)If the field current of the machine is reduced by 10%, while the mechanical power input to the machine is maintained...
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 5 A 3-phase, 22 kV (phase), 500 MVA star-connected synchronous generator has a per phase reactance Xg of 1.5 pu and supplies 0.8 pu per phase real power (P) at the rated voltage, with a lagging power factor of 0.6 to the load. Find the actual excitation voltage Vo in kV (line value). 96.392
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...
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