Problem 4.9: A 60-Hz synchronous generator rated 30 MVA at 0.90 powerfactor has the no-load frequency of 61 Hz. Determine (1) the prime moverspeed regulation, (2) generator frequency regulation, and (3) generatorfrequency droop rate.

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Answered: Problem 4.9: A 60-Hz synchronous…

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

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A 25-MVA, 11.5 kV synchronous machine is operating as a synchronous condenser, as discussed in Appendix D (section D.4.1). The generator short-circuit ratio is 1.68 and the field current at rated voltage, no load is 420 A. Assume the generator to be connected directly to an 11.5 kV sourc a. What is the saturated synchronous reactance of the generator in per unit and in ohms per phase? The generator field current is adjusted to 150 A. b. Draw a phasor diagram, indicating the terminal voltage, internal voltage, 15 urce. and armature current. c. Calculate the armature current magnitude (per unit and amperes) and its relative phase angle with respect to the terminal voltage. d. Under these conditions, does the synchronous condenser appear inductive or capacitive to the 11.5 kV system? e. Repeat parts (b) through (d) for a field current of 700 A.
A short shunt compound generator has an armature,shunt field and series field resistances of0.02 ohm, 80 ohm and 0.03 ohm respectively. The generator’s induced emf is 510V when theterminal voltage is 500V. How much load current is delivered under this condition.
2.A 10-MVA 4.6-kV 60-Hz 6-pole three phase synchronous generator has armature resistance of 2 ohms and synchronous reactance of 6 ohms. It is operated at rated frequency to supply rated load at rated voltage at a power factor of 0.9 lagging. Assume mechanical losses are negligible. a.Determine the magnitude of the line-to-line excitation voltage. b.Determine the input power for the generator, in MW. (Please compute in W or kW before converting to MW)
B) fill in the blanks: that of rotor MMF. 1)In a 3-phase synchronous motor the speed of stator MMF is ......... 2)The synchronous reactance of the synchronous machine is....... 3) When two transformers are operating in parallel, they will share the load as under...... 4)A synchronous motor is operating on no-load at unity power factor. If the field current is increased, power factor will become..
The internal characteristics of DC shunt generator can be obtained from *
Which of the following is true in the phasor diagrams drawn according to the ohmic, inductive and capacitive operating states of the round pole synchronous generator a) Due to the voltage Efd, the excitation current is large in capacitive operation and small in ohmic operation b) Due to the voltage Efd, the excitation current is large in ohmic operation and small in inductive operation c) Due to the voltage Efd, the excitation current is small in capacitive operation and large in inductive operation. d) Due to the voltage Efd, the excitation current is large in capacitive operation and small in inductive operation.
(use 2-decimal digits for solutions) A synchronous generator runs at 250 rpm and generates at 50-Hz. There are 216slots, each containing 5 conductors arranged in a full-pitched winding for 3-phasestar connection. All the conductors of each phase are in series and the flux perpole at no-load sinusoidally distributed over the pole pitch is 30 mWb. Find the emfinduced in each phase winding and the terminal voltage.
2.2 A three-phase synchronous generator has a reactance of 1.5 p.. and negligible resistance. It supplies a rated current of 1.0 p.. at 1.0 p.u. terminal voltage to a lagging load of 0.9 power factor. Determine the rated excitation voltage in p.u. and the internal load angle. Construct the performance chart of the generator in 2.1 (above) assuming its rating is 450 MVA.
Part 1:- SYNCHRONOUS GENERATOR 1. List the types of synchronous generators. 2. Explain the working principle of synchronous generators. 3. Synchronous generators can be subjected to two tests, what are they? 4. Draw the circuit for testing the synchronous generator on no load. 5. What the importance of Open Circuit Test of synchronous generators? 6. Draw the O.C.C. of 3 phase synchronous generators. What the bending of the cure represents for?
Which of the following is true for the phasor diagrams drawn according to the ohmic, inductive and capacitive operating states of a round pole synchronous generator? a) Due to the voltage Efd, the excitation current is equal in capacitive operation and inductive operation b) Due to the voltage Efd, the excitation current is large in capacitive operation and small in inductive operation c) Due to the voltage Efd, the excitation current is small in ohmic operation and larger in inductive operation d) Due to the voltage Efd, the excitation current is small in capacitive operation and large in inductive operation.
What are the conditions in paralleling of these DC Generators:a. Shuntb. Seriesc. Compound
The standard practice of synchronous generator construction now a days is to have Cylindrical field Rotating armature Either of the above Rotating field In an alternator, the armature reaction influences the magnitude of No load loss Wave form of generated voltage. Speed of the machine Flux Terminal voltage per phase

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Problem 4.9: A 60-Hz synchronous generator rated 30 MVA at 0.90 power factor has the no-load frequency of 61 Hz. Determine (1) the prime mover speed regulation, (2) generator frequency regulation, and (3) generator frequency droop rate.