Electrical System I ( EX-402 )
( EX - 4th Sem )
Course Outcomes
After Completion of this Course students will:
- Understand concepts of Electrical Machines.
- Understand concepts of Transformes, their types, equations and all types of factors related to them.
- Understand concepts of Induction motor, its working, equationns, procedures etc.
- Understand concepts of Motors working on both 1 and 3 phases.
- Be able to solve numericals related to electrical machines.
Course Content
Main Contents of this course which students needs to learn are:
- Transformer-I: Working principle, e.m.f. equation, construction, phasor diagrams, equivalent circuit, voltage regulation, losses, separation of hysteresis and eddy current losses, efficiency, tests: open circuit and short circuit, load, Sumpner’s test, Condition for maximum efficiency and regulation, Power and distribution transformer, allday efficiency, Excitation phenomenon. Auto transformer: working, advantages, its equivalent circuit and phasor diagram.
- Transformer-II: Three phase transformer: its construction, groups and connections, their working and applications; Scott connection; Parallel operation of Transformers: application, advantages, requirement and load sharing; Tap changers, cooling, conservator and breather. Pulse and high frequency transformers.
- Three phase Induction Motor- I:Working principle, construction, comparison of slip ring and squirrel cage motors, steady state analysis, phasor diagram and equivalent circuit, power flow diagram, torque-speed and power-speed characteristics, Losses and efficiency, No load and block rotor test, circle diagram
- Three phase Induction Motor-II: Starting of squirrel cage and slip ring motors, power factor control, Cogging & Crawling, Double cage & Deep bar Indication Motor, impact of unbalanced supply and harmonics on performance, speed control, braking, Induction Generator. Applications
- Single Phase Motors: Single Phase Induction motor; double revolving field theory, equivalent circuit and its determination, performance calculation, starting methods and types of single phase Induction motors: their working principle and applications, comparison with three phases Induction Motor. Single phase A.C. series motor, Servo motors, Linear Induction Motor
Book References
Some books which will help you to learn this course:
- V.Del Toro, “Electrical Machines & Power Systems”, 1985, Prentice-Hall, Inc., EnglewoodCliffs
- .S K Bhattacharya, Electrical Machines, McGraw-Hil
- Ashfaq Hussain, Electrical Machines, Dhanpat Rai & Co
- Langsdorf, A.C. Machines, McGraw-Hill
- Samarajit Ghosh, Electrical Machines, Pearson
List of Experiments
- Perform turn ratio and polarity test on 1-phasetransformer.
- Perform load test on a 1-phase transformer and plot its loadcharacteristic.
- Perform OC and SC tests on a 1-phase transformer and determine its equivalent circuit. Also find its efficiency and regulation at different load and powerfactor.
- Perform OC and SC tests on a 3-phase transformer and determine its equivalent circuit. Also find its efficiency and regulation at different load and powerfactor.
- Perform Sumpner’s test on two 1-phase transformer and determine its efficiency at various load.
- Perform No-load and block rotor test on a 3- phase IM and determine its equivalentcircuit.
- Perform load test on a 3- phase IM and plot its performance characteristics.
- Study various types of starters used for 3- IMs.
- Perform No-load and block rotor test on a 1- phase IM and determine its equivalent circuit.
Experiment Notes
Cousre Notes
For "Course Notes" you can refer our Notes Section for 2nd Year( Click Here )
