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EX-501 · Electrical Machine-II/Official Syllabus

Electrical Machine-II (EX-501) - Official Syllabus

1
Unit 1

D.C. Machine-I

  • Basic construction of DC machines
  • types of DC machines and method of excitation
  • lap and wave windings
  • Emf equation
  • armature reaction and methods of limiting armature reaction
  • Commutation process and methods for improving commutation
  • Basic performance of DC generators and their performance characteristics
  • Metadyne and Amplidyne
  • permanent magnet DC motors
  • Brush less dc motors
2
Unit 2

D.C. Machine-II

  • Basic operation of DC motors
  • Torque equation
  • Operating characteristics of DC motors
  • Starting of DC motors- 2point, 3 point and 4 point starters
  • speed control of DC motors
  • losses and efficiency of DC machines
  • testing of DC machines
  • direct testing
  • Swinburne’s test and Hopkinson’s test
  • Application of DC machines
3
Unit 3

Synchronous Machine-I

  • Construction
  • types of prime movers
  • excitation system including brushless excitation
  • polyphase distributive winding
  • integral slot and fractional slot windings
  • emf equation
  • generation of harmonics and their elimination
  • armature reaction
  • synchronous reactance and impedance
  • equivalent circuit of alternator
  • relation between generated voltage and terminal voltage
  • voltage regulation of alternators using synchronous impedance, mmf, zpf and new A.S.A method
4
Unit 4

Synchronous Machine-II

  • Salient pole machines
  • two reaction theory equivalent circuit model and phasor diagram
  • determination of $X_d$ and $X_q$ by slip test
  • SCR and its significance
  • regulation of salient pole alternator
  • power angle equation and characteristics
  • synchronizing of alternator with infinite busbar
  • parallel operation and load sharing
  • synchronizing current, synchronizing power and synchronising torque coefficient
  • synchro scopes and phase sequence indicator
  • effect of varying excitation and mechanical torque
5
Unit 5

Synchronous machine-III

  • Synchronous motor operation
  • starting and stopping of synchronous motor
  • pull in torque
  • motor under load power and torque
  • reluctance torque
  • effect of excitation
  • effect of armature reaction
  • power factor adjustment
  • V curves
  • inverted V curves
  • synchronous motors as power factor correcting device
  • super synchronous and sub synchronous motors
  • hunting and damper winding efficiency and losses
  • Analysis of short circuit oscillogram
  • determination of various transient, sub transient and steady reactances and time constants
  • expression of transient and sub transient reactances in terms of self and mutual inductances of various winding
  • short circuit current
  • equivalent circuit
  • Single phase synchronous motors- hysteresis motor, reluctance motor
  • Repulsion motor
  • stepper motor
  • switched reluctance

Laboratory Experiments

  • To plot magnetisation characteristic of a separately excited DC generator
  • To perform load test on DC generators.
  • To perform load test on DC series and shunt motor
  • To perform Swinburn’s test on a DC machine and find out its efficiency under full load condition.
  • To conduct Hopkinson’s test on a pair of DC shunt machine.
  • To perform OCC and SCC test on an alternator and determine its regulation.
  • To determine regulation of alternator using mmf and zpf methods.
  • To synchronise alternator with infinite bus bar.
  • To plot V and inverted V curves for a synchronous motor
  • To find Xdand Xqof salient pole synchronous machine by slip test.
  • To Determine negative sequence and zero sequence reactance of an alternator.
  • To determine subtransient direct axis and quadrature axis synchronous reactances of salient pole machine.

Reference Books

  • Performance & design of AC machines — M.G. Say — CBS publishers & distributors, Delhi — 3rd edition
  • The Performance & design of DC machines — A.E. Clayton, N.N. Nancock — CBS publications & distributors, Delhi — 3rd edition
  • Electrical Machinery — P.S. Bhimbra — Khanna Pub.
  • Generalized theory of Electrical Machines — P.S. Bhimbra — Khanna publishers, Delhi
  • Electric Machines — Ashfaq Husain — Dhanpat Rai, New Delhi
  • Electric Machines — I.J. Nagrath, D.P. Kothari — Tata McGraw Hill , New Delhi
  • Electric Machines & Power Systems, Volume I — Syed A. Nasar — Tata McGraw Hill, New Delhi
  • Electric Machinery — A.E. Fitzerald, C. Kingsley, S.D. Umans — Tata McGraw Hill ,New Delhi — 5thedition
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