Description:
Synchronous machines working principles like “electromagnetic induction”, “faradays law”. are 2 types i.e. Salient pole & Cylindrical pole
Synchronous motor working & starting methods of synchronous motor, Armature winding is most important part of synchronous machine.
Armature reaction , phasor diagram, voltage regulation of alternator, Power flow analysis from input to output , parallel operation of alternators also analyzed. Hunting & damper windings concepts and V & inverted V curves also dicussed regarding both alternator & synchronous motor.
Applications in power plants i.e. power generation and pumping purpose
Prerequisite
To have knowledge on DC machines , faraday’s law & lenz’s law.
For whom
This tutorial has been developed for Electrical and Electronics students to help them understand the basic to advance concepts related to the synchronous machines, for those students who are preparing them for their engineering syllabus
Reference Books
1. Electric machinery - A.E. Fitzgerald, C.Kingsley and S.Umans, Mc GrawHiII Companies, 5th edition
2. Electrical machines-PS Bhimbra, Khanna Publishers
3. Performance and Design of AC Machines by MG.Say, BPB Publishers
4. Theory of Alternating Current Machinery- by Langsdorf, Tata McGraw-Hill Companies, 2ee edition.
5. Electric Machines -by I. J. Nagrath & D.P.Kothari, Tata Mc Graw Hill, 7th Edition.2005
Q1 . What is armature reaction? With the help of neat diagrams explain its effect on main flux in synchronous machines.
Q2 . Explain the following terms related 3-phase a.c. windings. .
i)Single-layer and double-layer windings.
ii)Full-pitch and short-pitch windings.
iii)Integral slot and fractional slot windings.
Q3 . Discuss about experimental determination of Xd and Xq of salient pole alternator using slip test.
Q4 . Why at any load, the power factor decreases and the armature current increases if the field current is varied above and below the normal excitation.
Q5 . A synchronous motor has an equivalent armature reactance of 3.3Ω. The exciting current is adjusted to such a value that the open circuit emf is 950V. Find the p.f. at which the motor would operate when it takes 80kW from 800V supply line
Q6 . Explain the effect of change in excitation and mechanical power input on the alternator performance
Q7 . Explain the step by step procedure for synchronization of an alternator to the infinite bus system
Q8 . Develop a solution for regulation of a salient pole synchronous generator
Q9 . A. Explain the working of a synchronous -induction motor.
B. What is hunting and how it can be suppressed
Q10 . Analyze the performance of synchronous motor for development of torque
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