Please answer, logically. Thank you. The ratings of the generators, motors, andtransformers of the network shown are:20 MVA, 18 kV, X," = 20%20 MVA, 18 kV, X," = 20%Generator 1:%3DGenerator 2:`dSynchronous Motor 3:30 MVA, 13.8 kV, X," = 20%Three-phase Y-Y Trans.: 20 MVA, 138/20 kV, X = 10%Three-phase Y-A Trans.: 15 MVA, 138/13.8 kV, X = 10%Draw the reactance diagram with all values markedin per unit. Choose a base of 50 MVA, 138 kV in the40Ω line.j40 Oj20 aj20 0AT3MA모ㅇ3

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The ratings of the generators, motors, and transformers of the network shown are: 20 MVA, 18 kV, X," = 20% 20 MVA, 18 kV, X," = 20% Generator 1: %3D Generator 2: %3D Synchronous Motor 3: Three-phase Y-Y Trans.: 20 MVA, 138/20 kV, X = 10% Three-phase Y-A Trans.: 15 MVA, 138/13.8 kV, X = 10% 30 MVA, 13.8 kV, X," = 20% %3D %3D Draw the reactance diagram with all values marked in per unit. Choose a base of 50 MVA, 138 kV in the

The ratings of the generators, motors, and transformers of the network shown are: 20 MVA, 18 kV, X," = 20% 20 MVA, 18 kV, X," = 20% Generator 1: %3D Generator 2: %3D Synchronous Motor 3: Three-phase Y-Y Trans.: 20 MVA, 138/20 kV, X = 10% Three-phase Y-A Trans.: 15 MVA, 138/13.8 kV, X = 10% 30 MVA, 13.8 kV, X," = 20% %3D %3D Draw the reactance diagram with all values marked in per unit. Choose a base of 50 MVA, 138 kV in the

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter9: Unsymmetrical Faults

Section: Chapter Questions

Problem 9.5P

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2A. What is another term for "shunt"? a) in series b) in parallel c) compounded d) none of the above 2B. Which of the following is/are a basic type of DC generator connection? a) series b) shunt c) compound d) all of the above
two alternators A and B having 5% speed regulation are working in parallel at a station. Alternator A is rated at 15 MW while B is at 20 MW. When the total load to be shared is 12 MW, then how much of the load will be shared by the alternator B?
1 Example-1: In a single-loop distribution system shown in the figure consider the generator to be of infinite short-circuitcapacity and with a voltage of 1.0 pu. Determine the fault currents flowing in circuit breakers B1, B2 and Bz for a Three phase to ground fault in the midde of line 4-5 when: a) Both transformers, T, and T2 are in service b) Only T1 is in service 1 T1 2 From То Impedance 0.0 + j0.01(T,) 0.0 + j0.01(T2) 0.0 + j0.08 0.02 + j0.05 0.01 + j0.03 0.0 + j0.06 0.01 + j0.09 0.01 + j0.09 1 B. B2 Вз -머 3 4 4 T2 7 6 5 6. 7 7
The following are the data for the unloaded synchronous generator with neutral is solidly grounded. Negative sequence generated voltage=0 Negative sequence current = 2.01 p.u Negative sequence impedance= 0.066 p.u The negative sequence component of voltage Va2 is
A. The DC generator in Figure 2 on Worksheet 4 is a_________a) cumulatively connected short-shunt compound DC generator b) differentially connected long-shunt compound DC generator c) differentially connected short-shunt compound DC generator d) series DC generator B. The DC generator in Figure 3 on Worksheet 4 is a_______a) cumulatively connected short-shunt compound DC generator b) differentially connected long-shunt compound DC generator c) differentially connected short-shunt compound DC generator d) series DC generator C. The DC generator in Figure 4 on Worksheet 4 is a_______a) cumulatively connected short-shunt compound DC generator b) differentially connected long-shunt compound DC generator c) differentially connected short-shunt compound DC generator d) series DC generator
A 3-phase generator (30 MVA, 13.8 KV, 0.15) supplies two motors (rated at 20 MVA, 12.8 KV, 20%, and 10 MVA, 12.8 KV, 20%, respectively) through a step-up transformer - transmission line - step- down transformer arrangement. The 3-phase transformers are rated at 35 MVA, 13.2 KV-A/115 KV-Y with 10 % leakage reactance. The line reactance is 80 ohms. Draw the equivalent per unit reactance diagram by selecting 30 MVA, 13.8 KV in the generator circuit. Also, calculate the current supplied by the source and the currents of each motor
With the same transformer banks as in Problem 3.47, Figure 3.41 shows the oneline diagram of a generator, a step-up transformer bank, a transmission line, a stepown transformer bank, and an impedan load. The generator terminal voltage is 15 kV (line-to-line). (a) Draw the per-phase equivalent circuit, aounting for phase shifts for positive-sequence operation. (b) By choosing the line-to-neutral generator terminal voltage as the reference, determine the magnitudes of the generator current, transmiss ion-line current, load current, and line-to-line load voltage. Also, find the three-phase complex power delivered to the load.
Equipment ratings for the five-bus power system shown in Figure 7.15 are as follows: Generator G1:Â Â Â Â 50Â MVA,Â 12kV,Â X=0.2 per unit Generator G2: 100Â MVA, 15 kV, X=0.2 per unit Transformer T1: 50 MVA, 10 kV Y/138kVY,X=0.10 per unit Transformer T2: 100 MVA, 15 kV /138kVY,X=0.10 per unit Each 138-kV line: X1=40 A three-phase short circuit occurs at bus 5, where the prefault voltage is 15 kV. Prefault load current is neglected. (a) Draw the positive-sequence reactance diagram in unit on a 100-MVA, 15-kV base in the zone of generator G2. Determine (b) the ThĂ©venin equivalent at the fault, (c) the subtransient fault current in per unit and in kA rms, and (d) contributions to the fault from generator G2 and from transformer T2.
Three single-phase two-winding transformers, each rated 3kVA,220/110volts,60Hz, with a 0.10 per-unit leakage reactance, are connected as a three-phase extended autotransformer bank, as shown in Figure 3.36(c). The low-voltage winding has a 110 volt rating. (a) Draw the positive-sequence phasor diagram and show that the high-voltage winding has a 479.5 volt rating. (b) A three-phase load connected to the low-voltage terminals absorbs 6 kW at 110 volts and at 0.8 power factor lagging. Draw the per-unit impedance diagram and calculate the voltage and current at the high-voltage terminals. Assume positive-sequence operation.
Consider the oneline diagram shown in Figure 3.40. The three-phase transformer bank is made up of three identical single-phase transformers, each specified by X1=0.24 (on the low-voltage side), negligible resistance and magnetizing current, and turns ratio =N2/N1=10. The transformer bank is delivering 100 MW at 0.8 p.f. lagging to a substation bus whose voltage is 230 kV. (a) Determine the primary current magnitude, primary voltage (line-to-line) magnitude, and the three-phase complex power supplied by the generator. Choose the line-to-neutral voltage at the bus, Va as the reference Account for the phase shift, and assume positive-sequence operation. (b) Find the phase shift between the primary and secondary voltages.
Equipment ratings for the four-bus power system shown in Figure 7.14 are as follows: Generator G1: 500 MVA, 13.8 kV, X=0.20 per unit Generator G2: 750 MVA, 18 kV, X=0.18 per unit Generator G3: 1000 MVA, 20 kV, X=0.17 per unit Transformer T1: 500 MVA, 13.8/500YkV,X=0.12 per unit Transformer T2: 750 MVA, 18/500YkV,X=0.10 per unit Transformer T3: 1000Â MVA, 20/500YkV,X=0.10 per unit A three-phase short circuit occurs at bus 1, where the prefault voltage is 525 kV. Prefault load current is neglected. Draw the positive-sequence reactance diagram in per unit on a 1000-MVA, 20-kV base in the zone of generator G3. Determine (a) the ThĂ©venin reactance in per unit at the fault, (b) the subtransient fault current in per unit and in kA rms, and (c) contributions to the fault current from generator G1 and from line 1-2.
A three-phase, 100-MVA, 20-kV generator is connected to a three-phase, 100-MVA, 20-kV motor through a transmission line. The reactances of the generator and motor are 0.25 and 0.20 per unit, respectively. The line reactance is 0.10 per unit. The motor is taking 50 [MW] at 0.8 power factor leading at rated voltage. Suppose a three-phase short circuit occurs at the generator terminals, determine the transient currents in the generator and motor as well as the short-circuit current.