Subject Code:55014 L:4 T/P/D:1 Credits:4 Int. Marks:25 Ext. Marks:75 Total Marks:100
UNIT I: Construction and Principle of operation
Constructional Features of round rotor and salient pole machines – Armature windings – Integral slot and fractional slot windings; Distributed and concentrated windings – distribution, pitch and winding factors – E.M.F Equation.
UNIT II: Synchronous Generator Characteristics
Harmonics in generated e.m.f. – suppression of harmonics – armature reaction - leakage reactance – synchronous reactance and impedance – experimental determination - phasor diagram – load characteristics.
UNIT III: Regulation of Synchronous Generator
Regulation by synchronous impedance method, M.M.F. method, Z.P.F. method and A.S.A. methods – salient pole alternators – two reaction analysis – experimental determination of Xd and Xq (Slip test) Phasor diagrams – Regulation of salient pole alternators.
UNIT IV: Parallel Operation of Synchronous Generator
Synchronizing alternators with infinite bus bars – synchronizing power torque – parallel operation and load sharing - Effect of change of excitation and mechanical power input. Analysis of short circuit current wave form – determination of sub-transient, transient and steady state reactances.
UNIT V: Synchronous Motors – Principle of Operation
Theory of operation – phasor diagram – Variation of current and power factor with excitation – synchronous condenser – Mathematical analysis for power developed .
UNIT VI: Power Circles
Excitation and power circles – hunting and its suppression – Methods of starting – synchronous induction motor.
UNIT VII: Single Phase Motors
Single phase Motors: Single phase induction motor – Constructional features-Double revolving field theory – Elementary idea of cross-field theory – split-phase motors – shaded pole motor.
UNIT VIII: Special Motors
Principle & performance of A.C. Series motor-Universal motor – Principle of permanent magnet and reluctance motors.
TEXT BOOKS:
Electric Machines – by I.J.Nagrath & D.P.Kothari, Tata Mc Graw-Hill Publishers, 7th Edition 2005.
Electrical Machines – by P.S. Bimbra, Khanna Publishers.
REFERENCE BOOKS:
The Performance and Design of A.C.Machines – by M.G.Say, ELBS and Ptiman & Sons.
Electric Machinery – by A.E. Fitzgerald, C.Kingsley and S.Umans, Mc Graw-Hill Companies, 5th edition, 1990
Theory of Alternating Current Machinery by Langsdorf, Tata Mc Graw-Hill, 2nd edition
Electromachanics-III (Synchronous and single phase machines), S.Kamakashiah, Right Publishers