Course10810515594 lectures
Electrical Machines - I
Prof. Tapas Kumar Bhattacharya · IIT Kharagpur
About
Transformer and D.C rotating machine will be the main topics to be discussed in this course. Working principle of ideal transformer and its equivalent circuit referred to two sides. Analysis of practical transformer & its equivalent circuit. Equivalent circuit referred to different sides and phasor diagram. Core loss and copper loss. Regulation & efficiency. Three phase transformer connection & vector group. Parallel operation of transformers. Autotransformer. Basic constructional features of D.C machine. Elementary lap and wave winding used in armature. Emf and torque equations of D.C. machine – generator and motor mode. Armature reaction and its effect. Compensationg winding. Shunt, series and compound machines. Generator characteristics. Motor characteristics. Efficiency, Basic tests.
Intended audience: UG Electrical Engineering as core subject. UG Mechanical and Mining Engineering as Elective subject.
Prerequisites: Basic Electrical Technology: Knowledge of elementary calculus
Lectures
Week 1
- Lecture 01 : Magnetic Circuit and Transformer
- Lecture 02 : Magnetising Current from B-H Curve
- Lecture 03 : Ideal Transformer, Dot Convention and Phasor Diagram
- Lecture 04 : Operation of Ideal Operation with Load Connected
- Lecture 05 : Equivalent Circuit of Ideal Transformer
- Lecture 06 : Rating of Single Phase Transformer: Rated Current and Rated Voltage with Example
- Lecture 07 : Transformer with Multiple Coils
Week 2
- Lecture 08 : Modelling of Practical Transformer - I
- Lecture 09 : Modelling of Practical Transformer - II
- Lecture 10 : Modelling of Practical Transformer - III
- Lecture 11 : Core Loss - Eddy Current Loss
- Lecture 12 : Factors on Eddy Current Loss Depends
- Lecture 13 : Hysteresis Loss
- Lecture 14 : Exact Equivalent Circuit
- Lecture 15 : Approximate Equivalent Circuit
- Lecture 16 : Determination of Equivalent Circuit Parameters - No Load Test
Week 3
- Lecture 17 : Short Circuit Test
- Lecture 18 : Choosing Sides to Carry Out O.C / S.C Test
- Lecture 19 : Efficiency of Transformer - Losses
- Lecture 20 : Efficiency (Contd.)
- Lecture 21 : Condition for Maximum Efficiency When Load Power Factor Constant
- Lecture 22 : Family of Efficiency Curve at Various Power Factor and Energy Efficiency
- Lecture 23 : Load Description and Energy Efficiency
- Lecture 24 : Regulation: its Expression
- Lecture 25 : Regulation: its Expression (Contd.)
Week 4
- Lecture 26 : Auto Transformer - Introduction
- Lecture 27 : Auto Transformer versus Two Winding Transformer
- Lecture 28 : Auto Transformer versus Two Winding Transformer (Contd.)
- Lecture 29 : Numerical Problems on Ideal Auto Transformer
- Lecture 30 : Two Winding Transformer Connected as Auto Transformer
- Lecture 31 : Practical Auto Transformer
- Lecture 32 : Equivalent Circuit of an Auto Transformer
- Lecture 33 : Polarity Test and Sumpner Test
Week 5
- Lecture 34 : 3 Phase Transformer Using 3 Single Phase Transformer
- Lecture 35 : Various Connections of 3-Phase Transformer - I
- Lecture 36 : Various Connections of 3-Phase Transformer - II
- Lecture 37: Vector Group of 3-Phase Transformer
- Lecture 38 : Vector Group (Contd.)
- Lecture 39 : Open Delta Connection
- Lecture 40 : 3-Phase Core Type and Shell Type Transformer
- Lecture 41 : Zig Zag Connection
- Lecture 42 : Effect of 3rd Harmonic Exciting Current and Flux
- Lecture 43 : Choosing Transformer Connection
- Lecture 44 : Choosing Transformer Connection (Contd.)
Week 6
- Lecture 45 : Phase Conversion using Transformer : Scott Connection
- Lecture 46 : Scott Connection (Contd.)
- Lecture 47 : 3 Phase to 6 Phase Conversion and O.C / S.C Test on 3 Phase Transformer
- Lecture 48 : Parallel Operation of Transformers - I
- Lecture 49 : Parallel Operation of Transformers - II
- Lecture 50 : Parallel Operation of Transformers - III
- Lecture 51 : Specific Magnetic and Electric Loadings
- Lecture 52 : Cooling of Transformer and Fillings of Transformer
- Lecture 53 : Output Equation of 3- Phase Transformer
Week 7
- Lecture 54 : Introduction to D.C Machine
- Lecture 55 : Single Conductor D.C Generator / Motor Operation
- Lecture 56 : Homopolar D.C Generator
- Lecture 57 : Homopolar D.C Motor
- Lecture 58 : Introduction to Rotating D.C Machines
- Lecture 59 : Armature Winding of D.C Machine - I
- Lecture 60 : Armature Winding of D.C Machine - II
- Lecture 61 : Armature Winding of D.C Machine - III
Week 8
- Lecture 62 : Generated Voltage Across the Armature
- Lecture 63 : Electromagnetic Torque in D.C Machine
- Lecture 64 : Generator and Motor Operation - Basics
- Lecture 65 : O.C.C and Load Characteristic of Separately Excited Generators
- Lecture 66 : Voltage Build Up in Shunt Generator
- Lecture 67 : Load Characteristic of Shunt Generator
- Lecture 68 : Qualitative Discussion on Armature Reaction
- Lecture 69 : ILL Effects of Armature Reaction
- Lecture 70 : Compensating and Interpoles
Week 9
- Lecture 71 : Armature Reaction (Contd.)
- Lecture 72 : Field Flux Density, Armature Flux Density and Resultant Field Distribution
- Lecture 73 : Field Patterns for Both Motor and Generators
- Lecture 74 : Demagnetising and Cross Magnetising mmf for Brush Shifted Machine
- Lecture 75 : Calculation of Compensating, Interpole and Series Field Turns
- Lecture 76 : Estimating Armature and Field Resistance from its Rating
- Lecture 77 : Power Flow Diagram, Rotational Loss
- Lecture 78 : Shunt Motor: Basic Equation
Week 10
- Lecture 79 : Starting of D.C Motor - 3- Point Starter
- Lecture 80 : Speed Control of Shunt Motor - I
- Lecture 81 : Speed Control of Shunt Motor - II
- Lecture 82 : Speed Control of Shunt Motor - III
- Lecture 83 : Field Control (Contd.)
- Lecture 84 : D.C Motor Braking
- Lecture 85 : Introduction to Series Motor
Week 11
- Lecture 86 : Series Motor Characteristics
- Lecture 87 : Series Motor Speed Control
- Lecture 88 : Universal Motor
- Lecture 89 : Swinburne Test
- Lecture 90 : Hopkinson Test
Week 12
Syllabus and materials
At NPTEL, as the course publishes them.
Credits and licence
- Institution
- IIT Kharagpur
- Department
- Electrical Engineering
- Teacher
- Prof. Tapas Kumar Bhattacharya
- Level
- Undergraduate
- Language
- English
- Subjects
- Engineering
- Source
- NPTEL
- Licence
- CC BY-NC-SA, as NPTEL states it. Non-commercial use only. NPTEL's terms
- Attribution
- NPTEL states: "Distributed under Creative Commons Attribution-ShareAlike / CC BY - NC - SA", beside a BY-NC-SA badge.
- Who can watch
- NPTEL gives no rating. Invisible Network shows it to Tweens profiles and older, judged from what the source says about it. How courses are placed
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