NPTEL : NOC:Electrical Machines-I (Electrical Engineering)

Co-ordinators : Prof.Tapas Kumar Bhattacharya


Lecture 1 - Magnetic Circuit and Transformer

Lecture 2 - Magnetising Current from B-H Curve

Lecture 3 - Ideal Transformer, Dot Convention and Phasor Diagram

Lecture 4 - Operation of Ideal Operation with Load Connected

Lecture 5 - Equivalent Circuit of Ideal Transformer

Lecture 6 - Rating of Single Phase Transformer: Rated Current and Rated Voltage with Example

Lecture 7 - Transformer with Multiple Coils

Lecture 8 - Modelling of Practical Transformer - I

Lecture 9 - 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

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 (Continued...)

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 (Continued...)

Lecture 26 - Auto Transformer - Introduction

Lecture 27 - AutoTransformer versus Two Winding Transformer

Lecture 28 - AutoTransformer versus Two Winding Transformer (Continued...)

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

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 (Continued...)

Lecture 39 - Open Delta Connection

Lecture 40 - 3-Phase Cone Type and Shell Type Transformer

Lecture 41 - Zig Zag Connection

Lecture 42 - Effect 3rd Harmonic Exciting Current and Flux

Lecture 43 - Choosing Transformer Connection

Lecture 44 - Choosing Transformer Connection (Continued...)

Lecture 45 - Phase Conversion using Transformer: Scott Connection

Lecture 46 - Scott Connection (Continued...)

Lecture 47 - 3 Phase to 6 Phase Conversion 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 - ooling of Transformer and Fillings of Transformer

Lecture 53 - Output Equation of 3- Phase Transformer

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

Lecture 62 - Generated Voltage Across the Armature

Lecture 63 - Electromagnetic Troque 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

Lecture 71 - Armature Reaction (Continued...)

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

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 (Continued...)

Lecture 84 - D.C Motor Braking

Lecture 85 - Introduction to Series Motor

Lecture 86 - Series Motor Characteristics

Lecture 87 - Series Motor Speed Control

Lecture 88 - Universal Motor

Lecture 89 - Swinburne Test

Lecture 90 - Hopkinson Test

Lecture 91 - Efficiency Calculation

Lecture 92 - Field Test on D.C Series Motor

Lecture 93 - Simplex Wave winding

Lecture 94 - Wave Winding (Continued...)