Course Title: Energy Conversion I
Type of Course: Compulsory, Theory
Offered to: EEE
Pre-requisite Course(s): None
Single-phase Transformer: principle of operation, construction, no load and excitation current, behavior during loading, effect of leakage flux, ideal transformer, leakage reactance and equivalent circuit of a transformer, equivalent impedance, voltage regulation, per unit quantities, regulation, losses and efficiency, determination of parameters by tests, polarity of transformer windings, vector group, transformer parallel operation. Harmonics in excitation current, transformer inrush current.
Poly-phase Transformer: three phase transformers, connections, harmonic suppression in three phase transformer connection.
Autotransformer: construction, working principle, auto-transformer vs. potential divider, copper saving, advantages/disadvantages, phasor diagrams, equivalent circuits, conversion of a two-winding transformer to an auto-transformer, applications.
Instrument transformers: measurement of high voltages and currents in power system using P.T. and C.T. (respectively). Use of P.T. and C.T. with protective devices.
Three-phase Induction Motor: rotating magnetic field, reversal of rotating magnetic field, synchronous speed, torque in induction motor. Construction - squirrel cage, wound rotor; slip and its effect on rotor frequency and voltage, equivalent circuit of an induction motor, air gap power, mechanical power and developed torque, torque speed characteristic, losses, efficiency & power factor, classification, motor performance as a function of machine parameters, shaping torque speed characteristic and classes of induction motor, per unit values of motor parameters, determination of induction motor parameters by tests, methods of braking, speed control.
Induction Generator: operation, characteristics, voltage build up, applications in wind turbine.
To understand the construction and operations of various transformers, 3-phase induction motor and induction generator
To analyse the characteristics of polyphase induction motors, to calculate various machine parameters based on design data and test results
To demonstrate the parallel operation of polyphase transformers
Application of induction generator for harvesting renewable energy e.g., wind turbine
Fundamental concepts of Electrical Circuits I & II course, and application of Faraday’s law
| CO No. | CO Statement | Corresponding PO(s)* | Domains and Taxonomy level(s)** | Delivery Method(s) and Activity(-ies) | Assessment Tool(s) |
|---|---|---|---|---|---|
| 1 | Explain the operations of transformers and 3-φ induction motor/generator by applying the knowledge of electrical circuits and electromagnetic induction | PO(a) | C2, C3 | Lectures, Discussions | Assignment, Class test, Final exam |
| 2 | Analyse the techniques of parallel operations of transformers (single to single phase, poly to poly phase) | PO(b) | C4 | Lectures, Discussions | Assignment, Class test, Final exam |
| 3 | At the end of the course the students will be able to design/develop three-phase transformer using single-phase transformers | PO(c) | C6 | Lectures, Discussions | Assignment, Final exam |
* Cognitive Domain Taxonomy Levels: C1 – Knowledge, C2 – Comprehension, C3 – Application, C4 – Analysis, C5 – Synthesis, C6 – Evaluation, Affective Domain Taxonomy Levels: A1: Receive; A2: Respond; A3: Value (demonstrate); A4: Organize; A5: Characterize; Psychomotor Domain Taxonomy Levels: P1: Perception; P2: Set; P3: Guided Response; P4: Mechanism; P5: Complex Overt Response; P6: Adaptation; P7: Organization
Program Outcomes (PO): PO(a) Engineering Knowledge, PO(b) Problem Analysis, PO(c) Design/development Solution, PO(d) Investigation,
PO(e) Modern tool usage, PO(f) The Engineer and Society, PO(g) Environment and sustainability, PO(h) Ethics, PO(i) Individual work and team work,
PO(j). Communication, PO(k) Project management and finance, PO(l) Life-long Learning
* For details of program outcome (PO) statements, please see the departmental website or course curriculum
| K1 | K2 | K3 | K4 | K5 | K6 | K7 | K8 | P1 | P2 | P3 | P4 | P5 | P6 | P7 | A1 | A2 | A3 | A4 | A5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 🗸 | 🗸 | 🗸 | 🗸 | 🗸 | 🗸 | 🗸 | 🗸 |
| Week | Lectures | Topic |
|---|---|---|
| 1 | 1-3 | Single-phase Transformer: principle of operation, construction, no load and excitation current, behaviour during loading, effect of leakage flux. |
| 2 | 4-6 | Ideal transformer, leakage reactance and equivalent circuit of a transformer, equivalent impedance, voltage regulation. |
| 3 | 7-9 | Per unit quantities, regulation, losses and efficiency, determination of parameters by tests. |
| 4 | 10-12 | Polarity of transformer windings, vector group, transformer parallel operation. Harmonics in excitation current, transformer inrush current. |
| 5 | 13-15 | Poly-phase Transformer: three phase transformers, connections, harmonic suppression in three phase transformer connection. |
| 6 | 16-18 | Autotransformer: construction, working principle, auto-transformer vs. potential divider, copper saving, advantages/disadvantages. |
| 7 | 19-21 | Phasor diagrams, equivalent circuits, conversion of a two-winding transformer to an auto-transformer, applications. |
| 8 | 20-24 | Instrument transformers: measurement of high voltages and currents in power system using P.T. and C.T. (respectively). Use of P.T. and C.T. with protective devices. |
| 9 | 25-27 | Three-phase Induction Motor: rotating magnetic field, reversal of rotating magnetic field, synchronous speed, torque in induction motor. |
| 10 | 28-30 | Construction - squirrel cage, wound rotor; slip and its effect on rotor frequency and voltage, equivalent circuit of an induction motor, air gap power, mechanical power and developed torque. |
| 11 | 31-33 | Torque speed characteristic, losses, efficiency & power factor, classification, motor performance as a function of machine parameters. |
| 12 | 34-36 | Shaping torque speed characteristic and classes of induction motor, per unit values of motor parameters. |
| 13 | 37-39 | Determination of induction motor parameters by tests, methods of braking, speed control. |
| 14 | 40-42 | Induction Generator: operation, characteristics, voltage build up, applications in wind turbine. Summary review. |
Class participation will be judged by in-class evaluation; attendance will be recorded in every class.
Continuous assessment will be done in the form of quizzes, assignments, in-class evaluations.
Final Examination: A comprehensive term final examination will be held at the end of the Term following the guideline of academic Council.
Homework, Assignment and Quizzes 20%
Final Examination 70%
Total 100%
Main Textbook
Electric Machinery Fundamentals by Stephen J. Chapman, McGraw-Hill, 2012 (5th edition)
Principles of Electric Machines and Power Electronics by P.C. Sen, 2014 (3rd edition)
Handbook of Renewable Energy Technology edited by A. F. Zobaa, World Scientific Co., 2011
Alternating Current Machines by A.F. Puchstein and T.C. Lloyd, 1942 (2nd edition)
Online resources or supplementary materials will be shared with the class on a need basis
Besides going through relevant topics of the textbook, it is strongly advised that the students follow the class Lectures and discussions regularly for a thorough understanding of the top