B- 1- Draw phasor diagram of an alternator works at lagging p.f.? Mention the alternator EMF equation taken for this phasor diagram? 2- What are the advantages of parallel operations of synchronous generators? List 1 conditions for proper synchronization of incoming generator with working genei See The Nsxt Page

B- 1- Draw phasor diagram of an alternator works at lagging p.f.? Mention the alternator EMF equation taken for this phasor diagram? 2- What are the advantages of parallel operations of synchronous generators? List 1 conditions for proper synchronization of incoming generator with working genei See The Nsxt Page

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter6: Power Flows

Section: Chapter Questions

Problem 6.48P

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9.09 The flux density distribution in the air-gap of a certain generator is such that it contains a fundamental, a third harmonic, and a fifth harmonic. The flux per pole due to the fundamental distribution is 9 x 10-3 weber, that due to the third harmonic distribution is 0.9 x 10-3 weber, that due to the fifth harmonic distribution is 0.4 x 103 weber. There are four armature slots per phase per pole, the connection are made for three-phase wye. and the coil pitch is 12/15. The frequency is 60 cycles and the generator has 4 poles. (a) Calculate the emf/turn. (b) If there are six turns/coil and two coil sides/slot, calculate the emf per phase. (c) Calculate the emf between line terminals. Ans. 2.32V; 212V; 364V
2. A synchronous generator is connected to an inductive load, please draw phasor diagram to show the relationship between the internal generated voltage of the generator and the terminal voltage across the load. If the same generator is connected to a capacitive load, please draw phasor diagram to show the relationship between the internal generated voltage of the generator and the terminal voltage cross the load again. Explain the difference of the terminal voltage responses at these two types of loads.
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.
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