Savitribai Phule Pune University, Maharashtra, Electrical Engineering Semester 4, Electrical Machines - I Syllabus

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Unit - 1 Transformers - 1

UNIT 1

Transformers

1.1 Single Phase Transformer

1.2 Concept of Ideal Transformer

1.3 Corrugated Core Transformer

1.4 Toroidal Core Transformer

1.5 Useful and Leakage Flux Its Effects

1.6 Resistance Leakage Reactance and Leakage Impedance of Transformer Winding and their effect on Voltage Regulation and Efficiency

1.7 Exact and Approximate Equivalent Circuits referred to L.V. And H.V. Side of the Transformer

1.8 Phasor Diagrams for NoLoad and On Load Conditions

1.9 Transformer Ratings

1.10 Losses in a Transformer their variation with Load Voltage Frequency on no Load Losses

1.11 Efficiency and Condition for Maximum Efficiency

1.12 All Day Efficiency

1.13 Auto Transformer their Ratings and Applications

1.14 Comparison with two Winding Transformers with respect to saving of Copper and Size

Unit - 2 Transformers - 2

UNIT 2

Transformers Three Phase Transformers

2.1 Polarity test

2.2 Parallel Operation of SinglePhase Transformers Conditions to be satisfied

2.3 Load Sharing under various conditions

2.4 Welding Transformer

2.5 Standard Connections of Three Phase Transformers and their suitability for various applications

2.6 Voltage Phasor Diagrams and Vector Groups

2.7 Descriptive Treatment of Parallel operation of Three Phase Transformers

2.8 Scott Connection or TT Connection

2.9 Open Delta or VV Connection

2.10 Three winding Tertiary Winding Transformers

Unit - 3 D.C. Machines (Part-1)

Unit 3

D.C. Machines Part–1

3.1 Construction Main Parts Magnetic Circuits Poles Yoke Field Winding Armature Core

3.2 Armature Windings Simple Lap and Wave Winding Commutator and Brush Assembly

3.3 Generating Action

3.4 E.M.F. Equation

3.5 Magnetization Curve

3.6 Flashing of Generator

3.7 Motoring Action

3.8 Types of DC Motors

3.9 Significance of Back E.M.F.

3.10 Torque equation

3.11 Working at NoLoad and OnLoad Losses

3.12 Power Flow Diagram and Efficiency

3.13 Descriptive Treatment of Armature Reaction

Unit - 4 D.C. Machines (Part-2)

Unit 4

D. C. Machines Part2

4.1 Characteristics of DC Motors

4.2 Applications of DC Series and Shunt Motors

4.3 Starting of DC Motors

4.4 Study of Starters for Series and Shunt motor

4.5 Solid State Starters

4.6 Speed Control of various Types of DC Motors

4.7 Commutation Process of Commutation Time of Commutation Reactance Voltage

4.8 Different forms of Commutations

4.9 Causes of Bad Commutation and its Remedies

Unit - 5 Three Phase Induction Motor

Unit 5

Three Phase Induction Motor

5.1 Construction Stator Squirrel Cage and Wound Rotors

5.2 Production of Rotating mmf

5.3 Principle of Working

5.4 Simplified Theory with Constant Air Gap Flux Slip Frequency of Rotor emf and Rotor Currents mmf produced by Rotor Currents Its speed w.r.t. Rotor and Stator mmf

5.5 Production of Torque TorqueSlip Relation

5.6 Condition for Maximum Torque

5.7 Torque Slip Characteristics

5.8 Effect of Rotor Resistance on Torque Slip Characteristics

5.9 Relation between Starting Torque Full Load Torque and Maximum Torque

5.10 Losses in Three Phase Induction Motor

5.11 PowerFlow Diagram

5.12 Relation between Rotor Input Power Rotor Copper Loss Gross Mechanical Power developed

5.13 Efficiency

Unit - 6 Three Phase Induction Motor

Unit 6

Three Phase Induction Motor

6.1 Induction Motor as generalized Transformer

6.2 Phasor Diagram

6.3 Exact and Approximate Equivalent Circuit

6.4 No Load and Blocked Rotor Tests to determine the Equivalent Circuit Parameters

6.5 Plotting the Circle Diagram Computation of Performance Characteristics from the Equivalent Circuit and Circle Diagram

6.6 Performance Curves

6.7 Necessity of Starter for 3Phase Induction Motors

6.8 Starters for SlipRing and Cage Rotor Induction Motor

6.9 Comparison of various Starters

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