9 Office Update To keep up-to-date with security updates, fixes, and Improvements, choose Check for Updates.3.O T, @3Machine 2Machine 1A 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%,X, = 4%, X, = 5%Transformers T, and T2:100 MVA, 204/345Y kV;X = 8%On a chosen base of 100 MVA, 345 kV in the transmission-line circuit, the lincrcactances arc X, = X, = 15% and X, = 50%. Draw cach of the three sequencenetworks and find thc zcro-scquencc bus impedancc matrix by mcans of thc Zusbuilding algorithm.Find the fault current if L-G fault occurs at the terminals of Machine2.e 2 of 3105 of 309 wordsEnglish (United States)MacBook Air

3 Machine 2 Machine 1 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, = X2 = 20%, %3D Xo 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 linc rcactances arc X, = X2 networks and find thc zcro-scquencc bus impedance matrix by mcans of the Zus building algorithm. = 15% and X, = 50%. Draw cach of thc threc sequc ncc %3! Find the fault current if L-G fault occurs at the terminals of Machine2 3.

3 Machine 2 Machine 1 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, = X2 = 20%, %3D Xo 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 linc rcactances arc X, = X2 networks and find thc zcro-scquencc bus impedance matrix by mcans of the Zus building algorithm. = 15% and X, = 50%. Draw cach of thc threc sequc ncc %3! Find the fault current if L-G fault occurs at the terminals of Machine2 3.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...

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Please help me solve question 1 below. Please provide a clear and readable solution. Thanks in advance!!! The course subject is Electrical Machines 2. NOTE: The answers are given below. Please provide the solution. If the answer given below is wrong, please give the correct answer. Thanks a lot!!!
A load of 1600 kW at 0-8 p.f. is shared by two 1000 kVA transformers having equal turn ratios and connected in parallel on their primary and secondary side. The full load resistance drop is 1% and reactive drop is 6% in one of the transformers, the corresponding values in the other transformer being 1.5% and 5%. Calculate the power and power factor at which each transformer is operating.
A conventional phase transformer given in the figure will be connected as an autotransformer in two different ways. Each For a connection, find the input and output powers by drawing the connection. a) Connection of 1220 / 220V autotransformer b) 1000 / 1220V autotransformer connection
For a 50 kVa distribution transformer, which on its high voltage side is 2400 V and on the short-circuit low voltage secondary has a voltage of 240 V with a frequency of 60 Hz, it has a leakage impedance of 0.72+j0.92 Ω on the high voltage side and 0.0070+j0.0090 Ω on the high voltage side low tension. The short-circuit test presented values of 48 V, 20.8 A and 617 W for high voltage. The impedance responsible for the excitation current is 6.32+j43.7 Ω referring to the low voltage side. One open circuit test, with the low voltage side energized, presented the values of 240 V, 5.14 A and 186W. According to the information presented, determine: a. Draw the equivalent circuit on the high voltage side and present the impedance values in the circuit. b.Draw the equivalent circuit on the low voltage side and present the impedance values in the circuit. c. For the high voltage value, calculate the value of the current flowing in the magnetizing impedance. d.Determine the yield for an…
Q1. The following figure shows the differential protection of power transformers with specifications of 20 MVA, 66/11 KV.Trans is No load.If a two-phase short circuit occurs between phases b and ¢ It is desirable to calculate the currents passing through the CTs and relays R, Y, B. If these relays are three overcurrent relays with inverse characteristics as T=0.63 / log (I / Iset) and Iset =0.5A.Will this work for short circuit relays? If yes, which relay works faster and at what time?
Q.4 A 3-phase transmission line operating at 10 KV and having a resistance of 1 Q and reactance of 4 0 is connected to the generating station bus-bars through 5 MVA step-up transformer having a reactance of 5%. The bus bars are supplied by a 10 MVA alternator having 10% reactance. Calculate the short-circuit KVA fed to symmetrical fault between phases if it occurs (i) at the load end of transmission line. (ii) at the high voltage terminals of the transformer.
There single-phase transformers are 3 transformers (Each of them is to be connected Delta-Delta) is rated at 50kVA, 2200/400 V , Zeq = 1.4 + j1.8 ohms (Ref. the high-voltage side of the transformer). The high voltage side of the transformer receives 2200 V by the transmission line (impedance of transmission line is 0.15+j0.80 ohms). The Low voltage side of the transformer disburses load by the transmission line (impedance of transmission line is 0.001+j0.003 ohms). Determine Load Voltage when the transformer works at rated by PF=0.85 lagging
The conversion ratio of 300KVA single phase transformer is N1/N2=4 and the equivalent model is as follows. jX, i, jX, R, eee R. JA ml Here; R1+jX1=0.85+j4.8 Ohm, R2+jX23D0.012+j0.07 Ohm. Neglecting (assuming absent) the magnetizing current/arm; When the secondary ends, namely ZL, are short-circuited, find the voltage that must be applied by the primary in order for a current of 100 A to flow from the secondary side. 150.2751 VI. 80.0174 dercce O371.5707 IV). 80.0662 derece 257.9380 VI. 79 9753 derecc O 110 5621 VL 30 0174 derece O 123 8569 VI. 80 0662 derece 475.6493 VI 79.9753 derccc er
Q3: At the parallel operation of three-phase transformers: a) Give an explanation for the following cases: i. Two-lamps are glow-up ii. Three-lamps are glow-up b) Two three-phase 11kV/ 380 V transformers are connected in parallel to serve a load of 36 kVA at unity power factor. The secondary side current for one transformer is 14.1 A, determine the load sharing for each transformer and the current of the other transformer.