B-Discuss the purposes of damper bars in synchronous machines?Q4: A-For synchronous machines :-i-Explain what are the advantages of star connection over delta connection for statorwindings of synchronous generator?ii-State the advantages of parallel operation of synchronous generators?iii-Define synchronous condenser?

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Answered: B-Discuss the purposes of damper bars…

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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Discuss the importance of synchronizing generators in a power plant and the consequences of asynchronous operation.
a. / E/=/V,7, torque angle is positive b. / E//V.7, torque angle is positive d. / E/>/ V.7, torque angle is 90° e. / E/=/ V.7, torque angle is negative Vo
Two identical 20 MW three-phase alternators operate in parallel. The governor of first machine is such that the frequency drops uniformly from 50 Hz on no-load to 48 Hz on full load. The corresponding uniform speed drop of the second machine is from 50 Hz to 47.5 Hz. How will the two machines share a load of 30 MW?
A 3-phase, 2000 kVA, 11 kV, 1800 rpm synchronous generator has a resistance of synchronous reactance of 15 ohms per phase. (a) The field current is adjusted to obtain the rated terminal voltage at open circuit. i. Determine the excitation voltage Ef ii. If a short circuit is applied across the machine terminals, find the stator current. (b) The synchronous machine is next connected to an infinite bus. The generator is made to deliver the rated current at 0.8 power factor lagging. i. Determine the excitation voltage Ef ii. Determine the maximum power the synchronous machine can deliver for the excitation current of part (b). Neglect Ra.
What are synchronous generators, and how do they contribute to power generation and stability in the grid?
there may be more than one answer
Subject:machines topic: synchronous machines
A 3-phase, 2000 kVA, 11 kV, 1800 rpm synchronous generator has a resistance of synchronous reactance of 15 ohms per phase. (a) The field current is adjusted to obtain the rated terminal voltage at open circuit. i.Determine the excitation voltage Ef . ii. If a short circuit is applied across the machine terminals, find the stator current. (b) The synchronous machine is next connected to an infinite bus. The generator is made to deliver the rated current at 0.8 power factor lagging. i.Determine the excitation voltage Ef . ii. Determine the maximum power the synchronous machine can deliver for the excitation current of part (b). Neglect Ra.
A 4-pole, 36-slot, 60-Hz, three-phase, Y-connected, synchronous generatorhas 10 turns per coil. The flux per pole is 50 mWb. For a series connection,determine (a) the synchronous speed, (b) the per-phase voltage, and (c) theline voltage
Two D.C shunt generators running in parallel supply s total load current of 125A. The shunt field and armature resistances of each machine are 50 ohms and 0.4 ohms respectively. The e.m.f.s. of the two generators at no load are 260 V and 250 V respectively. Determine the following a. Current supplied by each generator: and b.The bus bar voltage
A 30, 5 kVA, 208 V, four-pole, 60 Hz, star-connected synchronous machine has negligible Stator winding resistance and a synchronous reactance of 8 ohms per phase at rated terminal voltage. The machine is first operated as a generator in parallel with a 30, 208 V, 60 Hz power supply. (a) Determine the excitation voltage and the power angle when the machine is delivering rated kVA at 0.8 PF lagging. Draw the phasor diagram for this condition. (b) If the field excitation current is now increased by 20 percent (without changing the prime mover power), find the stator current, power factor, and reactive kVA supplied by the machine. (c) With the field current as in (a), the prime mover power is slowly increased. What is the steady-state (or static) stability limit? What are the corresponding values of the stator (or armature) current, power factor, and reactive power at this maximum power transfer condition?
A 60 MVA, 69.3 KV, three-phase synchronous generator has a synchronous reactance Xs = 15 ohm/phase. The generator is supplying its rated power (i.e. 60 MVA) to an infinite bus at 0.8 power factor lagging. Determine: a) The armature current Ia. b) The generator emf per phase (E). c) The power angle. d) The maximum power (P) that the generator can supply. Xs = j 150 la Vline = 69.3 KV

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