Syllabus - Electrical Machine-I (EE402)

Electrical Engineering

Electrical Machine-I (EE402)

IV

Transformer-I

Working principle, e.mf. 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.

Autotransformer

working, advantages, its equivalent circuit and phasor diagram.

Transformer-II

Three phase its construction, groups and connections, their working and applications; Scottconnection; Parallel operation of Transformers: application, advantages, requirement and load sharing; Tap changers, cooling, conservator and breather. Pulse and high frequency transformers. transformer:

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 field

Single Phase Motors

Single Phase 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 Induction motor; double revolving

Practicals

  • 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 variousload.

  • 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 performancecharacteristics.

  • Study various types of starters used for 3- IMs.

  • Perform No-load and block rotor test on a 1- phase IM and determine its equivalentcircuit.

Reference Books

  • Electrical Machines by Nagrath and Kothari, McGraw-Hill

  • P.S.Bimbhra, Electrical Machines,Khanna Publishers

  • V.Del Toro, “Electrical Machines & Power Systems”, 1985, Prentice-Hall, Inc., EnglewoodCliffs

  • S K Bhattacharya, Electrical Machines, McGraw-Hill

  • Ashfaq Hussain, Electrical Machines, Dhanpat Rai & Co

  • Langsdorf, A.C. Machines, McGraw-Hill

  • Samarajit Ghosh, Electrical Machines, Pearson