NOC:Electrical Machines-I


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...)