O e. None of theseClear my choiceThe three phase power and line-line ratings of the below electric power system is given below:Vmut ofMG: 50 MVA11 KVX= 4%T: 50 MVA11/20 KVX= 4%M: 43.2 MVA18 KVX= 4%By choosing 100 MVA and 11 KV on the generator side as base values, the new per unit impedance of the generator isand the new perunit impedance of the motor is4A three-phase, 60-Hz lossless transmission line is 350 Km long. The line has a phase constant B of 0.001266825 rad/Km and a suimpedance Z of 326.09 N. What is the total receiving end reactive power Qr when the sending end voltage is 230 KV and the revoltage is 219 KV and the power angle & is 15 degrees?out of

The given system is, For generator: For motor: And

The three phase power and line-line ratings of the below electric power system is given below: T Vm M G: 50 MVA 11 KV - X= 4% T: 50 MVA 11/20 KV X= 4% M: 43.2 MVA 18 KV X= 4% By choosing 100 MVA and 11 KV on the generator side as base values, the new per unit impedance of the generator is and the new perunit impedance of the motor is

The three phase power and line-line ratings of the below electric power system is given below: T Vm M G: 50 MVA 11 KV - X= 4% T: 50 MVA 11/20 KV X= 4% M: 43.2 MVA 18 KV X= 4% By choosing 100 MVA and 11 KV on the generator side as base values, the new per unit impedance of the generator is and the new perunit impedance of the motor is

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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There is a three-phase system such that the phase current in the generator, lines and charging phase is the same. The phase voltage in the generator must be 1000 [V] with clockwise sequence. The connected load must be such that the phase current in each load is 10 [A] and its power factor is 0.97 “lagging”. a) Determine phase currents in the generator, lines and phase in the load
In the following power system M ilio YA T₂ L47 YA 5 ΔΥ synchronous generators G₁,G₂ and synchronous motor M all have the same per-unit impedances Xo=0.05, X₁=X₂=0.7 The three transformers T₁, T₂, T3 are identical with X=0.1pu. Finally, the three transmission lines L47, L57, L67 are identical with per-unit impedances X₁=0.2, X₁=X₂=0.1 Pre-fault all voltages are 1 pu. Then the a phase at bus 6 faults to ground (through zero impedance). What is the magnitude of the per-unit fault current? उह 4 7 L 67 L 57 Y
The figure below shows the one-line diagram of a four- bus power system. The voltages, the scheduled real power and reactive powers, and the reactances of transmission lines are marked at this one line diagram (The voltages and reactances are in PU referred to 100 MW base. The active power P2 in MW is the last three digits (from right) of your registration number (i.e for the student that has a registration number 202112396, P2 =396). [10] Starting from an estimated voltage at bus 2, bus 3, and bus 4 equals V2 (0) = 1.15<0°, V3 = 1.15 < 0°, V4 1.1< 0°. 1- Specify the type of each bus and known & unknown quantities at each bus. 2- Find the elements of the second row of the admittance matrix (i.e. [Y21 Y22 Y23 Y24]). 3- Using Gauss-Siedal fınd the voltage at bus 2 after the first iteration. 4- Using Newton-Raphson, calculate: |- The value of real power (P2), at bus 2 after the first iteration. Il- The second element in the first row of the Jacobian matrix after the first iteration. 2 P2…
a syn A: A sylienfonotus generator of 100 MVA, 22 kV, and 0.25 pu transient reactance supplies a motor of 50 MVA, 22 kV, and 0.2 pu transient reactance. The motor is drawing 40 MW at 0.8 power factor leading and terminal voltage of 21.9 kV. The line connecting them has a reactance of 0.05 pu on a base of 100 MVA. Find the transient currents in the generator, the motor, and the fault when a 3-ph fault occurs at the motor terminals. Take SB = 100 MVA, VB = 22 kV, and use the internal voltages %3D %3D of the machines method.
The reactance's of the alternator during the periods of steady state are given bellow, Leakage reactance(X)=0.18 ohm, and armature reactance (Xad) = 0.67 ohm. The value of the syncronous reactance during the steay state conditions is Syncronous Reactance in ohm
A generator is connected through a transformer to a synchronous motor as shown in the following figure. (All values in this problem are per unit.) Before the fault V,=0.9,1=1 with power factor 0.8 lagging. jX, P + jX ds jX" dm + E. E The reactances are Xd=0.15 , X,=0.1 , X âm=0.35. A symmetric fault occurs at P. Find the per-unit current magnitudes in the fault, the generator and the motor (a) using subtransient voltages. (b) using a Thevenin equivalent.
Three identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 24 MVA, 50 Hz, 0.85 PF lagging, 4-poles, Y-connected, with synchronous reactance of 2 Q and an armature resistance of 0.05 Q. Each of generators G1 , G2 , and G3 has a characteristic power-frequency slope of 4.2 MW/Hz , 4.5 MW/Hz, and 5.0 MW/Hz, respectively The no-load frequency of each generator is set to 52.4 Hz. The load increases with no changes in the settings of the no-load frequencies, until a generator reaches its maximum rated power first. At what system frequency does this limit occur? Select one: O a. fsys = 49.2 Hz O b. None O c. fsys = 48.9 Hz O d. fsys = 48.32 Hz Clear my choice
There are only two generators in a power system, and these generators supply a total load of 10 MW. The no-load frequencies and droop constants for the generators are 51 Hz, 0.5Hz/MW, and 52 Hz, 1Hz/MW, respectively. What is the frequency of the combined system? What are the powers produced by individual generators? At this loading condi- tion, if the generator 1 is delivered to producc equal amount of power as the generator 2, what should be the no-load frequency of the generator 1?
If the load draws a current of 2727 A, in phase, from a generator, which of the following statement is true? O A. The reactive power is flowing from generator to the load and the real power is flowing from the load to the generator. O B. Since the current is in phase with the generator voltage, both the real and reactive power is flowing from the generator to the load. O .Since the current is leading the generator, both the real and reactive power is flowing from the load to the generator. O D. The real power is flowing from generator to the load and the reactive power is flowing from the load to the generator. O E. None of the other choices are correct
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Three identical steam-turbine generators G1, G2, and G3 are operating in parallel. Each generator is: 7.2 KV, 25.4 MVA, 60 Hz, 0.77 PF lagging, 4-poles, Y-connected, with synchronous reactance of 2 Q and an armature resistance of 0.05 Q. Each of generators G¡ , and G2 has a characteristic power-frequency slope of 5.8 MW/Hz, and no-load frequency of 62.5 Hz. Generator G3 has a characteristic power-frequency slope of 6.0 MW/Hz. Find the no-load frequency of generator G3 for which all generators supply a load of 38.5 MW, at fsys = 60 Hz. Select one: O a. fsys = 62.5 Hz O b. fsys = 61.85 Hz O c. None O d. fsys = 61.58 Hz Clear my choice
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