No. of credits = 03
Transformer:
Principle of operation, construction – Core and Shell type, EMF equation, Equivalent circuit, Losses, Efficiency and Voltage Regulation, OC and SC tests – determination of Equivalent circuit parameters, predetermination of Efficiency and Voltage Regulation, applications. - 8 hrs.
Three phase Induction Motor:
Rotating magnetic field, working principle, construction – Squirrel Cage and Slip ring type, rotor frequency, Torque equation, Torque – slip characteristics, Losses and Efficiency.
Starters – Autotransformer and Star-Delta type starters.
Speed control – rotor resistance control and pole changing methods.
Applications. - 10 hrs
Synchronous Motor:
Principle of operation, construction, synchronous impedance, Back EMF, Effect of excitation, V and inverted V curves, Mechanical power developed, starting methods, synchronous condenser, applications. - 8 hrs.
References:
1.Langsdorf H., “Theory of Alternating Current Machines”, 2nd Edition, TMH, 1994.
2.Say M. G., “Alternating Current Machines”, 5th edition, ELBS, 1994.
3.Fitzerald, Kingsley and Umans, “Electrical Machinery”.
4.Stephen J. Champman, “Electrical Machinery Fundamentals”.
5.Parkersmith S, Problems in Electrical Engineering, Asia Publishing House, 1984
ANALYSIS AND CONTROL OF ELECTROMAGNETIC DEVICES LABORATORY
1. Load test on single-phase transformer to determine Efficiency and Voltage Regulation.
2. O.C. and S.C. tests on single-phase transformer to determine Equivalent circuit parameters, predetermination of Efficiency and Voltage Regulation.
3. Separation of No load losses of 3-phase Induction motor.
4. No load and Blocked rotor tests to determine Equivalent circuit parameters and performance characteristics of 3-phase Induction motor.
5. Load test on 3-phase Induction motor.
6. V and inverted V curves of Synchronous motor.