Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 4, Problem 4.4Q
Sketch the phasor diagrams and magnetic field relationships for a synchronous generator operating at (a) unity power factor, (b) lagging power factor, (c) leading power factor.
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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.
The power factor of a 3-phase, star-connected, salient-pole synchronous generator is ignored by the armature winding resistance;a) 0.8 inductiveb) 0.8 capacitivec) 1 ohmicDraw the phasor diagrams for the values.
Draw a complete circuit diagram of 1 phase synchronous alternator including the field excitation circuit. Then, draw the phasor diagram of the generator a general leading power factor. Include the phase resistance in the diagram.
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- Draw voltage phasor diagrams for different load cases of salient synchronous generators and derive the expression of the induced voltage.arrow_forward(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.arrow_forwardTwo 30 AC generators are such that one has twice the linear dimensions of the other. The field windings of each are excited to give identical sinusoidal air gap flux density waveform. Both have the same number of stator slots and identical winding patterns. The conductors per slot in big generator in K times that of the smaller one. The value of K to get equal no-load voltage at same frequency is (a)8 (b) 8 1 (d) 7 (c) 4arrow_forward
- A synchronous generator runs at 250 rpm and generates at 50-Hz. There are 216 slots, each containing 5 conductors arranged in a full-pitched winding for 3-phase star connection. All the conductors of each phase are in series and the flux per pole at no-load sinusoidally distributed over the pole pitch is 30 mWb. Find the emf induced in each phase winding and the terminal voltage.arrow_forwardWhat are the conditions in paralleling of these DC Generators:a. Shuntb. Seriesc. Compoundarrow_forwardThe 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 phasearrow_forward
- A synchronous generator is connected to a pure capacitive load. The field excitation is kept constant and the stator resistance is assumed negligible. Explain, with the help of phasor diagram(s), how the generator’s terminal voltage will vary when the capacitive load is increased while the power factor is kept constant.arrow_forwardA 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.arrow_forwardA long shunt compound generator delivers a current of 10A at 200V and has a series field resistance and shunt field resistance of 1 ohm and 200 ohms respectively. Then line current is a. 2A b. 1A c. 9A d. 10Aarrow_forward
- How does a synchronous generator operate, and what are its primary applications in power generation?arrow_forwardThe type generator field winding is supplied from the external D.C. source. separately excited Compound Shunt Self excitedarrow_forwardDuestion. Explain sompound DC :- describe its generator types of also and terminal characteristics compound DC. generatorarrow_forward
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