power factor isThe three phase power and line-line ratings of the below electric power system is given below:VgVmMG: 50 MVA20 KVX= 4%T: 50 MVA20/40 KVX= 4%M: 43.2 MVA36 KVX= 4%By choosing 100 MVA and 20 KV on the generator side as base values, the new per unit impedance of the generator isand the new perunit impedance of the motor is7.5%None of thesea load absorbs 50 MVA at 0.8 pf leading at line to line voltage of 18 KV 10.238%11.43%find the perunit impedance of this load on a base of 100MVA and 208.333%Select one:O a. 5.183-j3.888 puOb. 5.183 +j 3.888 puO c. 1.295 -j0.972 pu1:49 AMEN4/14/20 power factor isThe three phase power and line-line ratings of the below electric power system is given below:T.VmMG: 50 MVA20 KVX= 4%T: 50 MVA20/40 KVX= 4%M: 43.2 MVA36 KVX= 4%By choosing 100 MVA and 20 KV on the generator side as base values, the new per unit impedance of the generator isand the new perunit impedance of the motor is16 %None of these8%VA at 0.8 pf leading at line to line voltage of 18 KV.4%bedance of this load on a base of 100MVA and 20 KV.Select one:O a. 5.183-j3.888 puOb. 5.183 + j 3.888 puOc.1.295-10.972 puEN O1:49

In this question we will find reactance of generator and motor on new base ..

The three phase power and line-line ratings of the below electric power system is given below: Vg Vm M G: 50 MVA 20 KV X= 4% T: 50 MVA 20/40 KV X= 4% M: 43.2 MVA 36 KV X= 4% By choosing 100 MVA and 20 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 7.5% None of these a load absorbs 50 MVA at 0.8 pf leading at line to line voltage of 18 KV 10.238% 11.43% find the perunit impedance of this load on a base of 100MVA and 20 8.333% Select one: O a. 5.183 -j 3.888 pu Ob. 5.183 +j 3.888 pu OC. 1.295-10.972 pu 1:49 EN 4714

The three phase power and line-line ratings of the below electric power system is given below: Vg Vm M G: 50 MVA 20 KV X= 4% T: 50 MVA 20/40 KV X= 4% M: 43.2 MVA 36 KV X= 4% By choosing 100 MVA and 20 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 7.5% None of these a load absorbs 50 MVA at 0.8 pf leading at line to line voltage of 18 KV 10.238% 11.43% find the perunit impedance of this load on a base of 100MVA and 20 8.333% Select one: O a. 5.183 -j 3.888 pu Ob. 5.183 +j 3.888 pu OC. 1.295-10.972 pu 1:49 EN 4714

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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Number 17
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
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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
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.
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Figure below shows a power system. The rating of generators and transformers are:G1:25MVA, 6.6KV, jO.2 p.u. G2:15MVA, 6.6KV, jo.15 p.u. G3:30MVA, 13.2KV, jo.15 p.u. T1: 30MVA, 6.6A- 115Y KV, jo.1 p.u.T2: 15MVA, 6.6A- 115Y KV, jo.1 p.u. T3:single phase units each rated 10MVA, 69/ 6.9 KV, jo.1 p.u. Find te reactances in p.u, take a base of 30MVA, 6.6 KV in the circuit of G1 .=.XG1 G2} 4 A lubu T2 T1 T3 G1 G3 j120 2 j90 N
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
L-type equivalent circuit and parameters for a continuous sinusoidal phase of a 5.5 kW, 1460 rpm, line voltage 220 V and frequency 50 Hz star-connected 3-phase ASM, ignoring core (iron) losses given as follows: R1=0.21 Ohm, R2=0.18 Ohm, X1=X2=0.66 Ohm and Xm=9.9 Ohm How many times the inrush current will be the rated current when the ASM is started directly? Answer options group 3.7473 5.2280 8.0815 7.1534 1.2558 4.3763 2.6455 6.3414
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