A 287 -MVA, 115 -kV, 0.9-PF-lagging, 50-Hz, two-pole, del-connected synchronous generatorhas a per unit synchronous reactance of 1.8 and a per-unit armature resistance of 0.711(a) What are its synchronous reactance and armature resistance in ohms?(b) What is the magnitude of the internal generated voltage Ea at 125% rated condition(c) Find torque angle ô at these conditions?(d) Draw vector diagram for this circuit.(e) Ignoring losses in this generator, what torque must be applied to its shaft by the primemover at150% of full load?O If the field current is held constant, what is the maximum power possible out of thisgenerator?Page 2 of 2361 wordsD'Focus国目100%

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Answered: A 287 -MVA, 115 -kV, 0.9-PF-lagging,…

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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Under short circuit, the reactance’s of the synchronous generator during the steady state condition are following, Leakage reactance(Xl)= 0.11 ohm and Armature reactance (Xad)= 0.7 ohm The direct axis synchronous (steady state) reactance (Xd) is
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
1) A 50 Hz, 3.75 MVA, 3.18 kV, three-phase synchronous generator with rated (nominal) currentof In = 682 A has open- and short-circuit characteristic listed in Table 1 and Table 2 respectively.Determine saturated and unsaturated synchronous reactance in per-unit and in Ohms and calulateshort circuit ratio (SCR). The generator is delivering rated power at 0.95 power factor leading atthe rated therminal voltage. Using given open-circuit characteristic approximately determine thefield current under rated loading.
A synchronous generator of 100 MVA, 14.4kv, power factor 0.8 lagging, connected in Y, has a resistor in the armature negligible, a synchronous reactance of 1.0 per unit and a speed drop of 3%. The generator is connected in parallel with an infinite bus of 60hz and 14.4kv. a) What is the synchronous reactance of the generator in ohms? b) what is the internal voltage generated in nominal conditions? c) what is the frequency without load of the generator so that it delivers the nominal power of the system? d) Assume that the generator initially operates at nominal conditions. if it decreases 5% generated internal voltage Ea, what will be the new armature current Ia?
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A 10 KVA, 400 V, 3 phase, star cónnected synchronous generator has an armature resistance of 0.80 per phase and synchronous reactance of 1.5 Q per phase. The voltage regulation at a power factor 0.6 lagging is
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Energy Question-1) Three identical synchronous generators were connected in parallel and the idle frequency values of each generator were set to 54 Hz. The frequency - power characteristic slopes of the first and second generators are 5.3 MW/Hz and the slope of the third generator is 3.9 MW/Hz. When these three identical synchronous generators feed a load together, the system frequency becomes f=51.7 Hz. According to this;a-) Calculate the active power value that the first generator will provide to the load.b-) Find the active power that the second generator will provide to the load.c-) Find the active power that the third generator will provide to the load.d-) Calculate the power of the load.(All values in options a, b, c, and d in this Question will be entered as two digits after the comma.) NOTE: If the information in the text and the photo is different, please solve the question using the information given in the photo. Help me please... Thank you so much.
Cascaded outages will cause individual generators to and results Select one: O a. make heavy losses, complete shutdown O b. heat up the windings, lose of synchronism O c. lose the synchronism, complete shutdown O d. lose the synchronism, heavy losses
Electrical machines
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