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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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.
(021) Q21) A 5-k VA, 220-V, Y-connected, three-phase, salient-pole synchronous generator is used to supply power to a unity pf load. By means of a slip test, the direct-axis synchronous reactance is found to be 122 and the quadrature-axis synchronous reactance 792. Assume that rated current is delivered to the load at rated voltage and that armature resistance is negligible. (a) Compute the corresponding value of the excitation voltage. (b) What is the value of the internal phase displacement angle Y. (c) What is the value of the power angle? (d) Draw a carefully labeled phasor diagram. Q22) Repeat Prob.21 for the case where the load pf is 0.8 lagging. Q23) Repeat Prob.21 for the case where the load pf is 0.8 leading.
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 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…
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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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