OSA) A 480-V 375-kVA 0.8-PF-lagging Y-connected synchronous generator has a synchronous reactance of 0.4 2 and a negligible armature resistance. This generator is Suppiying power to a 480-V 80-kW 0.8 PF leading Y-connected synchronous motor with a synchironous reactance of 1.1 and a negligible armature resistance. The synchronous generator is adjusted to have a terminal voltage of 480 V when the motor is drawing the rated power at unity power factor. (a) Calculate the magnitudes and angles of E, for both mnchines. (b) If the flux of the motor is increased by 10 percent, what happens to the terminal voltage of the power system? What is its new value? (c) What is the power factor of the motor after the increase in motor flux? 60 Hz, star-connect n per phase. When eld loss, and the pows eglect olimic resistanc he power factor. synchrs

OSA) A 480-V 375-kVA 0.8-PF-lagging Y-connected synchronous generator has a synchronous reactance of 0.4 2 and a negligible armature resistance. This generator is Suppiying power to a 480-V 80-kW 0.8 PF leading Y-connected synchronous motor with a synchironous reactance of 1.1 and a negligible armature resistance. The synchronous generator is adjusted to have a terminal voltage of 480 V when the motor is drawing the rated power at unity power factor. (a) Calculate the magnitudes and angles of E, for both mnchines. (b) If the flux of the motor is increased by 10 percent, what happens to the terminal voltage of the power system? What is its new value? (c) What is the power factor of the motor after the increase in motor flux? 60 Hz, star-connect n per phase. When eld loss, and the pows eglect olimic resistanc he power factor. synchrs

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...

See similar textbooks

Similar questions

23. As load is increased from no load to full load on a 3-phase squirrel-cage induction motor, what happens to the ..
13. A 250-V, 50-kW shunt generator has 1000 tuPAS ficld winding. On no load a current of 3'5 A in the field winding produces a terminal voltage of 250 V, but on full load the shunt current has to be increased to 5 A for the same terminal voltage at the same speed. Calculate the number of series field turns per pole required for level compounding.
Vi Q1) A 220 V, Four pole, 50 Hz Single phase induction motor hasy an actual impedances of Z1 = 1.86 +j 2.56, and Z2 = 3.56 +1 2.567 and total rotational losses (Pfe+ Pfw) of 62 W Find the motor Efficiency at Slip of (5%) Note Zf = 12.4 +j 17.15, Zb= 0.84 +j 1.26 Draw the equivalent circuit with the parameters? Solution: Rr ملاحظة: 72 تهمل لان الدائرة المكافئة لا تحتوي على Z2. 71=1.86 + 32.56.52 17 f = 12.4 +3 17.15 2 : Zb=0.84 + J 1.26 Zt 15.1 + j 20. 97 25.84 154.24.52 I in Put= 220 25-84 = 8.51 A 12= 733.31 1094.09 *100 = in Put Power = 220 * 8.51 * cos 54.24 1094.09 W iPd = 8.51² (12.4 -0.84) (1-0.05) = 795.31 w W out Put Power = 795.32-62 733.31 W 67.02% X1 = roo ea Xm xm R₂ R₂
Differentiate between a cumulative compound DC generator and a differential compound DC generator.
A 40 MVA, 24-KV, 0.85-PF-lagging, 50-Hz, 4-pole, Delta-connected, 3- phase, steam-turbine generator has a synchronous reactance of 10 per- phase, and a negligible armature resistance. The field current is adjusted for 26-KV generator output line voltage at no load. This generator is connected to operate in parallel with a large power system (infinite bus). If the field current is unchanged, determine the absolute maximum output power of this generator. Select one: a. Pout, max = 187.2 MW b. Pout, max = 108 MW O c. Pout, max = 62.4 MW %3D O d. None
2. A) Which of the following 3-phase motors has a wire wound rotor? a) polyphase induction motor b) polyphase wound rotor motor c) both "a" and "b" d) neither "a" nor "b" B) Which of the following 3-phase motors has a more maintenance free design. a) 3-phase wire wound rotor b) 3-phase squirrel-cage rotor
A 13.8-kV, 50-MVA, 0.9-power-factor-lagging, 60-Hz, four-pole Y-connected synchronous generator has a synchronous reactance of 2.5 Q and an armature resistance of 0.2 2. At 60 Hz, its friction and windage losses are 1 MW, and its core losses are 1.5 MW. The field circuit has a dc voltage of 120 V, and the maximum Ir is 10 A. The current of the field circuit is adjustable over the range from 0 to 10 A. The OCC of this generator is shown in Figure P4-1. 4.2 Open-circuit characteristic 20 18 (a) How much field current is required to make the terminal voltage V, (or line voltage V,) equal to 13.8 kV when the generator is running at no load? 16 (b) What is the internal generated voltage E, of this machine at rated conditions? 14 12 (c) What is the phase voltage V of this generator at rated conditions? 10 (d) How much field current is required to make the terminal voltage V, equal to 13.8 kV when the generator is running at rated conditions? (e) Suppose that this generator is running at…
Solve it within 30 min I will upvote
A non-salient pole synchronous generator having synchronous reactance of 0.8 pu is supplying 1 pu power to a unity power factor load at a terminal voltage of 1.1 pu. Neglecting the armature resistance, the angle of the voltage behind the synchronous reactance with respect to the angle of the terminal voltage in degrees is
Indui circuit resistance of 18 kW, 240V direct current series generator 0.12 Ohm, excitation winding resistance 0.08 is Ohm. Find the value of the moment induced in the inductor in this generator operating at 700 rpm at half load.
A 15-kV 35-KVA 0.76-PF-lagging 50-Hz four-pole Y-connected steam-turbine generator has a synchronous reactance of 3.50 0 per phase and an armature resistance of 0.75 0 per phase. This generator is operating in parallel with a large power system (infinite bus). a) What is the magnitude of E, at rated conditions? b) What is the generator's torque angle at rated conditions? c) If the field current is constant, what is the maximum power possible out of this generator? How much reserve power or torque does this generator have at full load? d) Sketch the corresponding phasor diagram and calculate for the armature current (assume the field current is still unchanged) e) At the absolute power possible, how much reactive power will this generator be supplying or consuming?
A 480-V, 500-kVA, 0.82-PF-lagging, Y-connected synchronous generator has a synchronous reactance of 0.38 2 and a negligible armature resistance. This generator is supplying power to a 480-V, 80-kW, 0.82- PF-leading, Y-connected synchronous motor with a synchronous reactance of 1.8 Q and a negligible armature resistance. The synchronous generator is adjusted to have a terminal voltage of 480 V when the motor is drawing the rated power at unity power factor. a) Calculate the magnitudes and angles of E4 for both machines. b) If the flux of the motor is increased by 12 percent, what happens to the terminal voltage of the system? c) Draw the resultant combined phasor diagram. power