Electric machinery fundamentals
5th Edition
ISBN: 9780073529547
Author: Chapman, Stephen J.
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Textbook Question
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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Draw voltage phasor diagrams for different load cases of salient synchronous generators and derive the expression of the induced voltage.
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- (vi) Explain the concept of load transfer between the DC generators operating in parallel using load –voltage characteristics.arrow_forwardExplain the characteristics and usage areas of the asynchronous generator types.arrow_forwardWhich 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.arrow_forward
- Describe the operation of a synchronous generator and its role in power generation, including concepts such as excitation control and synchronization.arrow_forwardWrite and explain the parallel connection conditions of synchronous generators?arrow_forwardBriefly explain the impact of self-induced emf in a DC generator? What techniques are employed to minimize this impact? What measures are taken to overcome the demagnetizing effect in a generator?arrow_forward
- Explain the concept of load transfer between the DC generators operating in parallel using load -voltage characteristics.arrow_forwardIn a long-shunt compound generator, the terminal voltage is 220 Vwhen generator delivers 110 A. Determine (a) induced emf and (b)total power generated. Given that shunt field, series field,diverter and armature resistances are 90 Ω, 0.025 Ω, 0.04 Ω and0.03 Ω respectively.arrow_forwardDiscuss about Generator modeling in transient stability and derive the formula for the real and reactive power supplied by it.arrow_forward
- Describe the operation of a synchronous generator and its role in power generation.arrow_forwardQ/ During the test of separately excited generator the speed of rotation must be held constant and the generator field resistance must be adjusted to make the generator terminal voltage 220V at no load. True Falsearrow_forwarda) 3-phase star-connected synchronous generator supplies a current of 10A having phase angle of 20° lagging 400V (phase voltage). Given the direct and quadrature axis reactances as 10ohms and 6.5ohms respectively and neglecting armature resistance, Find: 1. The load angle 2 The direct and quadrature components of armature currents 3. Voltage regulationarrow_forward
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