X,x²No SpacingNarmalHeading 1Heading 2TitleSubtitieep up-to-date with security updates, fixes, and improvements, choose Check for Updates.3.(33EMachine 2Machine 1* A YoY ATwo synchronous machines are connected through three-phasetransformers to the transmission line shown in below fig.The ratings and reactancesof the machines and transformers areMachines 1 and 2:100 MVA, 20 kV;X; = X, = X, = 20%,Xp = 4%,X, == 5%%3DTransformers T, and T,:100 MVA, 204/345Y kV;X 8%On a chosen base of 100 MVA, 345 kV in the transmission-linc circuit the liner cactances arc X, = X, = 15% and Xo = 50%. Draw cach of thc three sequencenetworks and find thc zcro-scqucncc bus impedancc matrix by mcans of the Z pusbuilding algorithm.%3DFind the fault current if L-G fault occurs at the terminals of Machine2.wordsEnglish (United States)

(3 T2 Machine 1 Machine 2 Y A Two synchronous machines are connected through three-phase transformers to the transmission line shown in below fig.The ratings and reactances of the machines and transformers are Machines 1 and 2: 100 MVA, 20 kV; X; = X, = X, = 20%, %3D %3D %3D X = 4%, X, = 5% %3D %3D Transformers T, and T,: 100 MVA, 204/345Y kV; X 8% On a chosen base of 100 MVA, 345 kV in the transmission-linc circuit the line r cactances arc X, = X2 = 15% and X networks and find the zcro-scqucncc bus impedance matrix by mcans of the Zpus building algorithm. = 50%. Draw cach of thc threc scquence %3D %3! Find the fault current if L-G fault occurs at the terminals of Machine2.

(3 T2 Machine 1 Machine 2 Y A Two synchronous machines are connected through three-phase transformers to the transmission line shown in below fig.The ratings and reactances of the machines and transformers are Machines 1 and 2: 100 MVA, 20 kV; X; = X, = X, = 20%, %3D %3D %3D X = 4%, X, = 5% %3D %3D Transformers T, and T,: 100 MVA, 204/345Y kV; X 8% On a chosen base of 100 MVA, 345 kV in the transmission-linc circuit the line r cactances arc X, = X2 = 15% and X networks and find the zcro-scqucncc bus impedance matrix by mcans of the Zpus building algorithm. = 50%. Draw cach of thc threc scquence %3D %3! Find the fault current if L-G fault occurs at the terminals of Machine2.

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

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.41P: Consider the single-line diagram of the power system shown in Figure 3.38. Equipment ratings are...

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The one-line diagram of a simple power system is shown in Figure below. The neutral of each generator is grounded through a current-limiting reactor of 0.25/3 per unit on a 100-MVA base. The system data expressed in per unit on a common 100-MVA base is tabulated below. The generators are running on no-load at their rated voltage and rated frequency with their emfs in phase. G Stark Item Base MVA Voltage Rating X' x² 20 kV 20 kV 20/220 kV 20/220 kV 100 0.05 0.15 0.15 0.10 0.10 220 kV 0.125 0.125 0.30 0.15 0.25 025 0.7125 0.15 100 100 0.15 0.05 0.10 0.10 0.10 100 0.10 100 100 Lu La 220 kV 0.15 220 kV 0.35 100 A balanced three-phase fault at bus 3 through a fault impedance Zf= jo.I per unit. The magnitude of the fault current in amperes in phase b for this fault is: Select one: A. 345.3 B. 820.1 C. 312500 3888888 产产

1. A single-phase power system as shown in Figure 1 consists of a 240 V, 60 Hz generator supplying a load, Zod = 8 + j6 Q through a transmission line of impedance, Zne = 0.08 + j0.14 Q. Answer the following questions: (1) transformer, T; and T2. Determine the voltage at the load and transmission line losses without the (ii) Determine the voltage at the load and transmission line losses with the transformer, T, and T2. T1 T2 1:10 10:1 IG Zaine Zioad source Figure 1
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