Basic Electrical Technology ( Three phase AC ,Magnetic circuits & Core losses, Transformer ) module 5,8and 7

• Module-5 Three phase AC circuits
  • Lesson 18 Three-phase Balanced Supply [ Generation of Three-phase Balanced Voltages ~ Three-phase Voltages for Star Connection ~ Reversal of phase sequence from R-Y-B to R-B-Y ~ Relation between the Phase and Line Voltages for Star Connection ~ Relation between the Phase and Line Voltages for Delta Connection ~ Currents for Circuit with Balanced Load (Star-connected) ~ Total Power Consumed in the Circuit (Star-connected) ~ Delta(ÃŽ")-Star(Y) conversion and Star-Delta conversion ]
  • Lesson 19 Three-phase Delta-Connected Balanced Load [ Currents for Circuits with Balanced Load (Delta-connected) ~ Total Power Consumed in the Circuit (Delta-connected) ]
  • Lesson 20 Measurement of Power in a Three-phase Circuit [ Two-wattmeter Method of Power Measurement in a Three-phase Circuit ~ Phasor diagram for a three-phase balanced star-connected circuit ]
• Module-6 Magnetic circuits & Core losses
  • Lesson 21 Magnetic Circuits [ Different laws for calculating magnetic field ~ Biot-Savart law ~ Ampere's circuital law ~ Application of Ampere's circuital law in magnetic circuit ~ Reluctance & permeance ~ B-H Characteristics ~ Different zones of B-H characteristic ~ Analysis of Series magnetic circuit ~ Analysis of Series-parallel magnetic circuit ~ Important equations ~ General discussion on solving problems ~ Worked out example ]
  • Lesson 22 Eddy Current & Hysteresis Loss [ Voltage induced in a stationary coil placed in a time varying field ~ Eddy current ~ Use of thin plates or laminations for core ~ Derivation of an expression for eddy current loss in a thin plate ~ Hysteresis Loss ~ Undirectional time varying exciting current ~ Energy stored, energy returned & energy density ~ Hysteresis loop with alternating exciting current ~ Hysteresis loss & loop area ~ Seperation of core loss ~ Inductor ~ Force between two opposite faces of the core across an air gap ]
• Module-7 Transformer
  • Lesson 23 Ideal Transformer [ Ideal Transformer ~ Core flux gets fixed by voltage and frequency ~ Analysis of ideal transformer ~ No load phasor diagram ~ Transformer under loaded condition ~ Dot convention ~ Equivalent circuit of an ideal transformer ]
  • Lesson 24 Practical Transformer [ Practical transformer ~ Core loss ~ Taking core loss into account ~ Taking winding resistances and leakage flux into account ~ A few words about equivalent circuit ]
  • Lesson 25 Testing, Efficiency & Regulation [ Determination of equivalent circuit parameters ~ Qualifying parameters with suffixes LV & HV ~ Open Circuit Test ~ Short circuit test ~ Efficiency of transformer ~ All day efficiency ~ Regulation ]
  • Lesson 26 Three Phase Transformer [ Three phase transformer ~ Introducing basic ideas ~ A wrong star-star connection ~ Bank of three phase transformer ~ 3-phase transformer - a single unit ~ Vector Group of 3-phase transformer ]
  • Lesson 27 Auto-Transformer [ 2-winding transformer as Autotransformer ~ Autotransformer as a single unit ]
  • Lesson 28 Problem solving on Transformers [ Problems on 2 winding single phase transformers ~ Problems on 3-phase ideal transformer ~ Problems on ideal auto transformers ]
  
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