# Basic Electrical Technology

Indian Institute of Science Bangalore

Course contents:

• Introduction:
1. Sources of energy, Power generation: steam, hydel, gas, wind & nuclear; Power generation in Indian context.
2. General structure of electrical power system; power transmission & voltage levels; power distribution through overhead lines & underground cables.
• D.C Networks:
1. Basic concepts; concepts of linear, nonlinear, active, passive, unilateral and bilateral elements; ideal and practical voltage & current sources – conversion from one from the other.
2. Kirchoff’s laws – statements & explanation with example.
Mesh current method – definition of mesh & loop, advantage; illustrative example.
3. Node voltage method – Definition of a node, formation of equations, advantage & illustrative example.
Delta-Star & Star-Delta conversion; necessity, equivalence & relations; illustration with example.
4. Superposition principle – statement, limitations; explanation & illustration with examples; practical verification.
Thevenin’s theorem – statement, advantages in case of complex networks; explanation & illustration with examples.
5. Norton’s theorem – concept of duality; explanation & illustration; practical verification.
6. Nonlinear circuits – d.c circuits with one nonlinear element; its solution with example.
• D.C. Transients:
R-L & R-C transients – solution for current , voltage or charge as a function of time; time constants; R-L-C transients – under damped, over damped and critically damped conditions.
• Single Phase A.C. Circuits:
1. Generation of single phase a.c. voltage and determination of average (mean) and RMS (effective) values of voltage and current with special reference to sinusoidal waveforms; Form factor and peak factor for various waves.
2. Representation of sinusoidal time varying quantities as phasors; concepts of reactance, impedance and their representation in complex forms using j operator.
3. Steady state analysis of series R-L-C circuit & its phasor diagram.
4. Concept of power & power factor; expression of power in complex notation.
5. Concept of admittance, susceptance in parallel circuits; calculation of branch currents in parallel circuits.
6. Analysis of series parallel circuits & phasor diagrams.
7. Resonance in series and parallel circuits.
• Three phase A.C. Circuits:
1. Generation of 3-phase balanced sinusoidal voltage; star & delta connections; line & phase quantities (current & voltage).
2. Solution of 3-phase star/delta circuits with balanced supply voltage and balanced load; phasor diagram; 3-phase, 4-wire circuits.
3. Measurement of three phase power by two wattmeter method; phasor diagram with balanced load and determination of load power factor from wattmeter readings.
• Magnetic Circuit:
1. Ampere circuital law; magnetic circuit & its similarity with electric circuits; solution of series, parallel & series parallel magnetic circuits.
2. Iron losses – hysteresis & eddy current losses; relationship between B-H loop & hysteresis loss.
3. Energy stored in a magnetic field and force of attraction between pole faces.
• Transformer:
1. Constructional features and principle of operation; concept of ideal transformer under no load & loaded conditions; its equivalent circuit.
Practical transformer rating & its equivalent circuit.
2. Regulation – definition & importance; derivation of expression for it: Losses & efficiency, condition for maximum efficiency.
3. O.C & S.C. tests and determination of equivalent circuit parameters.
Various types of three phase connections of transformers.
4. Autotransformer – principle of operation & relative advantages & disadvantages over a two winding transformer.
• Rotating Machines:
1. Introduction of general constructional features (stator, rotor & air gap); conditions for production of steady electromagnetic torque.
2. Multi polar machine & concept of mechanical & electrical angle and their relation; importance of the relation n = 2f/p.
3. Expression for generated emf in a coil rotating relative to a field.
• Three phase induction motor:
1. Elementary balanced 3-phase distributed winding & production of revolving magnetic field; comment on its strength, speed and direction of rotation.
2. Constructional features and principle of operation; types of induction motors; definition of slip and its importance; relation between stator & rotor frequencies.
3. Per phase equivalent circuit; relation between air gap power, rotor copper loss and mechanical power developed; expression for electromagnetic torque developed.
4. Torque-slip characteristic, stable & unstable zones; modification of torque-slip characteristic for supply voltage, rotor resistance and frequency variation.
5. Basic principles of starting induction motor by direct on line, reactor, autotransformer, star-delta and rotor resistance starters.
• D.C. Machines:
1. Constructional features; elementary lap & wave windings; parallel paths in armature circuit.
2. EMF & torque expressions and their uses in both generating & motoring modes.
3. Classification of d.c. generators; characteristics of shunt, separately and compound generator; armature reaction & its effect.
4. Classification of d.c motors; characteristics of shunt & series motors.
Starting of d.c shunt motor; 3-point starter for shunt motor.
5. Speed control of shunt and series motors; field of applications.
• Measuring Instruments:
1. DC PMMC instruments – constructional feature and principle of operation; moving iron meters – construction and principle of operation.
2. Dynamometer type wattmeter; induction type energy meter construction & principle of operation.
• ##### Lecture 1 & 2 - Basic Electrical Technology
Prof. L. Umanand
• ##### Lecture - 3 Passive Components
Prof. L. Umanand
• ##### Lecture - 4 Sources
Prof. L. Umanand
• ##### lecture 5 Kirchoff&#39;&#39;s Law
Prof. L. Umanand
• ##### Lecture - 6 Modelling of Circuit
Prof. L. Umanand
• ##### Lecture - 07 Modeling of Circuit 2
Prof. L. Umanand
• ##### Lecture - 8 Analysis Using MatLab
Prof. L. Umanand
• ##### Lecture - 9 Sinusoidal steady state
Prof. L. Umanand
• ##### Lecture - 10 Transfer Function and Pole Zero domain
Prof. L. Umanand
• ##### lecture 11 - Transfer function &amp; pole zero
Prof. L. Umanand
• ##### Lecture - 12 The Sinusoid
Prof. L. Umanand
• ##### lecture 13 Phasor Analysis
Prof. L. Umanand
• ##### Lecture - 14 Phasor Analysis part 2
Prof. L. Umanand
• ##### Lecture - 15 Power Factor
Prof. L. Umanand
• ##### Lecture - 16 Power ports
Prof. L. Umanand
• ##### Lecture - 17 Transformer Basics
Prof. L. Umanand
• ##### Lecture - 18 Transformer Basic part 2
Prof. L. Umanand
• ##### Lecture - 19 Transformer Basics part 3
Prof. L. Umanand
• ##### Lecture - 20 The Practical Transformer
Prof. L. Umanand
• ##### Lecture - 21 Transformer 2
Prof. L. Umanand
• ##### Lecture - 22 The Practical Transformer Part 3
Prof. L. Umanand
• ##### Lecture - 23 DC Machine
Prof. L. Umanand
• ##### lecture 24 - DC Machines Part 2
Prof. L. Umanand
• ##### Lecture - 25 DC Generators
Prof. L. Umanand
• ##### Lecture - 26 DC Generators 2
Prof. L. Umanand
• ##### Lecture - 27 D C Motors
Prof. L. Umanand
• ##### Lecture - 28 DC Motor 2
Prof. L. Umanand
• ##### Lecture - 29 DC Motor 3
Prof. L. Umanand
• ##### Lecture - 30 Three Phase System
Prof. L. Umanand
• ##### Lecture - 31 Three Phase System 2
Prof. L. Umanand
• ##### Lecture - 32 Three Phase System - 3
Prof. L. Umanand
• ##### Lecture - 33 Three Phase System 4
Prof. L. Umanand
• ##### Lecture - 34 Three Phase Transformer
Prof. L. Umanand
• ##### Lecture - 35 Three Phase Transformer 2
Prof. L. Umanand
• ##### lecture 36 - Induction motor
Prof. L. Umanand
• ##### Lecture - 37 Induction Motor 2
Prof. L. Umanand
• ##### Lecture - 38 Induction Motor 3
Prof. L. Umanand
• ##### Lecture - 39 Induction Motor 4
Prof. L. Umanand
• ##### Lecture 40 - Synchronous Machine
Prof. L. Umanand