II-II (2021-2022)
A6208
Electrical Machines - II

Instructor

Mr. A. Ananda Kumar
ananda@vardhaman.org
+91 78934 79612

Objectives

This Course Electrical Machines-II, is offered as an integrated course having theory and practice that gives hands-on training adequately supported by required hardware. It deals with Synchronous Machines, single phase motors and Transformers, where students will learn about their construction, operation and testing. The types and characteristics, testing methods will also be discussed. The performance of these electrical machines will be verified by conducting various experiments in the laboratory.

Course Outcomes

After the completion of the course, the student will be able to:

A6208.1. Apply rotating machine fundamentals for construction and operation of Synchronous machines and Single Phase motors.

A6208.2. Analyze the characteristics and performance of synchronous machines, transformers and single phase motors

A6208.3. Apply appropriate speed control technique and starting method for Synchronous and single phase motors for any industrial or house hold applications.

A6208.4. Identify suitable test to determine the performance parameters of synchronous machines and transformers.

A6208.5. Compare various methods for finding voltage regulation of alternators.

Syllabus

Single phase transformers: Principle of operation, types, constructional details, EMF equation, operation on no load and on load, phasor diagrams, Equivalent circuit, losses and efficiency, regulation. Effect of variations of frequency and supply voltage on iron losses.

Testing of single phase transformers: OC and SC test, Sumpner’s test, Load sharing and operation of transformers in parallel, Separation of core losses Test. Three phase transformers: Type of connections, Relation between line and phase voltages and currents, use of tertiary winding, scott connection of transformers for phase conversion.Site selection, Plant layout, Coal its storage, Preparation, Han-dling, Feeding and burning, Cooling towers, Ash handling, Water treatment plant, Highpressure boilers and steam turbines.

Synchronous generators: Constructional Features of round rotor and salient pole machines, Armature windings, Integral slot and fractional slot windings; Distributed and concentrated windings, pitch and winding factors, E.M.F Equation. Synchronous Generator Characteristics, Harmonics in generated E.M.F., suppression of harmonics, armature reaction, leakage reactance, synchronous reactance and impedance, phasor diagram, load characteristics.

Regulation of synchronous generators: Regulation by E.M.F., M.M.F., Z.P.F. and A.S.A. methods. Salient pole alternators, two reaction analysis, determination of Xd and Xq (Slip test). Synchronizing alternators with infinite bus bars, synchronizing power, torque, parallel operation and load sharing. Effect of change of excitation and mechanical power input.

Synchronous motors and single phase induction motors: Theory of operation, phasor diagram, Variation of current and power factor with excitation, synchronous condenser, Mathematical analysis for power developed. Double revolving field theory, capacitance starting motor, Capacitance start and capacitor run motor, permanent capacitor motor, Shaded pole motor, speed-torque characteristics, Equivalent circuit, phasor diagrams, Applications.

Text Books

  1. J. B. Gupta , Theory and Performance of Electrical Machines, 14th edition, S. K. Kataria Sons, New Delhi, 2006
  2. P. S .Bimbra , Electrical Machinery, 7th edition, Khanna Publishers, New Delhi, 2000

Reference Books

  1. E. Fritzgerald, C. Kingsley, S. Umans, Electric Machinery, 5th edition, Tata McGraw Hill Companies, New Delhi, 2002
  2. L. Theraja, A. K. Theraja, A text book of Electrical Technology, 2nd edition, S. Chand Publishers, New Delhi, 2002

Resources

Lecture Notes

  1. Unit I Download
  2. Unit II Download
  3. Unit III Download
  4. Unit IV Download
  5. Unit V Download

Coursework

Inform the instructor any time prior to the due date for an assignment that you wish to use a late day; you may then turn in the assignment up to 24 hours late. Multiple late days may be used on the same assignment. There are no partial late days; turning in an assignment 2 hours late or 20 hours late will both use 1 late day. Note that late days are intended to cover both normal circumstances (you simply want more time to work on the assignment) and exceptional circumstances. The late assignments will receive at most half credit.

Alternate Assessments

# Name Assigned Due
1 Assignment # 1 - -
1 Assignment # 2 - -
1 Assignment # 3 - -
1 Assignment # 4 - -

Practice

Cycle-1 Experiments Download

  1. O.C. & S.C. Tests on Single phase Transformer.
  2. Three phase transformer : Verification of relationship between voltages and currents.
  3. Scott Connection of Transformer.
  4. Separation of core losses of a single phase tranformer.
  5. Sumpners test on a Pair of Single phase Transformer.
  6. Regulation of A Three Phase Alternator By Synchronous Impedance Method.
  7. V And Inverted V Curves of A Three Phase Synchronous Motor. Cycle-2 Experiments Download
  8. Equivalent Circuit of A Single Phase Induction Motor.
  9. Determination of Xd And Xq Of A Salient Pole Synchronous Machine.
  10. Synchronization of Alternators.
  11. Brake Test on A Single Phase Induction Motor.
  12. Efficiency Of 3 Phase Alternator.

Lab attendance is required.

Continuous Assessment

# Name Question Paper Schema
1 CAT - I Download Download
2 CAT - II Download Download

Commitments

It is my ultimate goal for this course, and my teaching, to develop your academic skills, advance your learning of electrical and electronics engineering concepts. To do so will require commitments from myself and from you toward meeting this goal.

Active Participation

I will be prepared and on time for class each day, ready to use class time to help you understand the course material. I will respectfully listen to, understand, and answer questions asked in class.

You are expected to attend class and actively participate in discussions every day, answering questions, asking questions, presenting material, etc. Your participation will be respectful of your classmates, both of their opinions and of their current point in their educational journey, as we each approach the material with different backgrounds and contexts.

Constructive Feedback

I will keep office hours and be available for outside appointments, and respond to emails. I will provide feedback on group presentations, exams, projects, and homeworks.

You are encouraged to provide constructive comments for improving this course for furthering your learning throughout the semester. There will be an opportunity for anonymous course feedback at the end of the semester, in which I hope you all participate. Through your feedback I can improve this course and others for future students.

Academic Integrity

I will abide by the above syllabus and grade your work fairly.

  • All students have an equal right to their opinions and to receive constructive criticism.
  • Students should positively engage the course material and encourage their classmates to do the same.
  • No students should gain an unfair advantage or violate their peers' commitment to honest work and genuine effort. It follows that any work that a student submits for class will be that student's own work. The amount of cooperation undertaken with other students, the consistency and accuracy of work, and the test-taking procedure should adhere to those guidelines that the instructor provides.
  • Members of the Hendrix community value and uphold academic integrity because we recognize that scholarly pursuits are aimed at increasing the shared body of knowledge and that the full disclosure of sources is the most effective way to ensure accountability to both ourselves and our colleagues.