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Old Course (2014)
Electrical Machines I
EG 2215 EE
Total: 6 hour /week
Year: II Lecture: 3 hours/week
Semester: II Tutorial: 1 hours/week
Practical: hours/week
Lab: 2 hours/week
Course Description:
This course covers the electrical machines, transformer, dc generator and dc motor. It deals with
the constructional details, operating principle, characteristics, testing methods of the above
machines.
Course Objectives:
After completion of this course, student will be able to explain the basic constructional details of
single-phase transformer, three-phase transformer and dc machine, operation and characteristics
of single-phase transformer, three-phase transformer, dc generator and dc motor, equivalent
circuit of transformer and dc machines, testing of transformer.
Course contents:
Unit 1. Single Phase Transformer : (14)
1.1 Operating Principle, Basic construction, operation, derivation of emf equation,
Transformation ratio, Concept of ideal transformer.
1.2 Constructional Details: Core type and shell type core construction, Stepped type
core cross-section, details of winding and its insulation.
1.3 No-load operation:phasor diagram, equivalent circuit for no-load operation
1.4 Operation of transformer with load: Magnetic circuit condition, amp-turn
balance.
1.5 Capacity of transformer: Definition, factors affecting the capacity of
transformer.
1.6 Equivalent circuit: Effect of winding resistance and leakage reactance,
equivalent circuit of real transformer, phasor diagram for resistive load and
inductive load, transformation of impedance, equivalent circuits refer to primary
side and secondary side, percentage impedance, voltage regulation.
1.7 Efficiency of transformer, Losses in transformer, Calculation of efficiency,
Condition for maximum efficiency, effect of load power factor on efficiency.
1.8 Testing of transformer – Polarity test, No-load test, Short-circuit test.
1.9 Auto transformer: Operating principle and application.
1.10 Parallel operation
1.11 Related numerical problems.
Unit 2. Three Phase Transformer: (8)
2.1 Introduction: Three units of single-phase transformers used as three-phase
transformer, evolution of three-phase transformer.
2.2 Three-phase transformer connections: Star/Star, Delta/Delta, Star/Delta,
Delta/Star, Open delta, their phasor group and applications, Relationship
between primary and secondary line and phase quantities.
2.3 Parallel operation of three-phase transformers 2.4 Parts of power transformer: Tank, Conservator, Breather, Explosion vent,
Transformer oil, Terminal bushing, Arching horns, Buchhloz’s relay, tap-
changer.
2.5 Study of name plate specification of transformer.
Unit 3. DC Generator : (13)
3.1 Constructional Details: Yoke, Field poles, Field winding, Armature and
itswinding.
3.2 Operation,operating principle, emf equation,
3.3 Types of dc generator: Separately excited and self-excited and voltage build-up
process, Shunt, series and compound generators, their circuit diagrams, relation
between emf generated and load terminal voltage, characteristics and
applications.
3.4 Losses and efficiency.
3.5 Armature reaction and method of reducing armature reaction.
3.6 Commutation
3.7 Related numerical problems
Unit 4. DC Motor : (10)
4.1 Operation:operating principle, torque equation, back emf, roles of back emf.
4.2 Types of dc motor: Shunt, series and compound, their characteristics and
applications.
4.3 Losses and efficiency.
4.4 DC motor starter
4.5 Speed control of dc motor
4.6 Related numerical problems
New Course (2022)
Electrical Machines I
EG2206EE
Year: II Total: 6 hours /week
Part: II Lecture: 3 hours/week
Tutorial: 1 hour/week
Practical: hours/week
Lab: 2 hours/week
Course Description:
This course covers the electrical machines, transformer, dc generator and dc motor. It deals
with the constructional details, operating principle, characteristics, testing methods of the
above machines.
Course Objectives:
After completion of this course, student will be able to
1. Explain the basic constructional details of single-phase transformer, three-phase
transformer and dc machine, operation and characteristics of single-phase transformer,
three-phase transformer, dc generator and dc motor, equivalent circuit of transformer
and dc machines, testing of transformer.
Course Contents:
Theory
Unit 1. Single Phase Transformer [14 Hrs.]
1.1. Operating Principle, Basic construction, operation, derivation of emf equation,
Transformation ratio, Concept of ideal transformer.
1.2. Constructional Details: Core type and shell type core construction, stepped type core
cross-section, Types of windings.
1.3. No-load operation: phasor diagram, equivalent circuit for no-load operation
1.4. Operation of transformer with load: Magnetic circuit condition, amp-turn balance.
1.5. Mutual and leakage fluxes, leakage reactance.
1.6. Capacity of transformer: Definition, factors affecting the capacity of transformer.
1.7. Equivalent circuit: Effect of winding resistance and leakage reactance, equivalent
circuit of real transformer, phasor diagram for resistive load and inductive load,
transformation of impedance, equivalent circuits refer to primary side and secondary
side, percentage impedance, voltage regulation.
1.8. Efficiency of transformer, Losses in transformer, Calculation of efficiency,
Condition for maximum efficiency, effect of load power factor on efficiency.
1.9. Testing of transformer – Polarity test, No-load test, Short-circuit test.
1.10. Auto transformer: Operating principle and application.
1.11. Parallel operation of single-phase transformer
1.12. Numerical problems.
Unit 2. Three Phase Transformer [8 Hrs.]
2.1. Introduction: Three units of single-phase transformers used as three-phase
transformer, evolution of three-phase transformer 2.2.Three-phase transformer connections: Star/Star, Delta/Delta, Star/Delta, Delta/Star, Open delta, their phasor group and applications, Relationship between primary and secondary line and phase quantities.
2.3. Parallel operation of three-phase transformers
2.4. Parts of power transformer: Tank, Conservator, Breather, Explosion vent,
Transformer oil, Terminal bushing, arching horns, Buchhloz’s relay, tap-changer.
2.5. Study of name plate specification of transformer.
2.6. Difference between power and distribution transformer
Unit 3. DC Generator [13 Hrs.]
3.1. Constructional Details: Yoke, Field poles, Field winding, Armature and its winding.
3.2. Operation, operating principle, emf equation,
3.3. Types of dc generator: Separately excited and self-excited and voltage build-up
process, Shunt, series and compound generators, their circuit diagrams, relation
between emf generated and load terminal voltage, characteristics and applications.
3.4. Losses and efficiency.
3.5. Armature reaction and method of reducing armature reaction.
3.6. Commutation and methods of improving commutation.
3.7. Application and significance of DC generator
3.8. Numerical problems
Unit 4. DC Motor [10 Hrs.]
4.1. Operation: operating principle, torque equation, back emf, roles of back emf.
4.2. Types of dc motor: Shunt, series and compound, their characteristics and
applications.
4.3. Losses and efficiency.
4.4. DC motor starter
4.5. Speed control of dc motor
4.6. Application and significance of DC motor
4.7. Numerical problems
Marking Scheme;
Final Note:
YOU CAN DOWNLOAD PDF NOTE OF THIS SUBJECT CLICKING DOWNLOAD BUTTON.
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