CBCGS [2018 - current]

CBGS [2014 - 2017]

Old [2000 - 2013]

## Units and Topics

## Syllabus

100 Three Phase Transformers- Construction and Phasor Groups

- Construction, Three phase transformer connections and phasor groups.

200 Three Phase Transformers- Operation

- Parallel operation, Excitation Phenomenon in transformers, Harmonics in three phase transformers, Disadvantages of harmonics in transformers, Suppression of harmonics, Oscillating neutral phenomenon, Switching in transient phenomenon, Open delta or V- connection, Three phase to two phase conversion (Scott connection).

300 Three Phase Induction Motors-introduction

- Construction, Principle of operation, Rotor frequency, Rotor emf, Current and Power, Induction motor phasor diagram, Analysis of Equivalent circuit, Torque-speed characteristics in braking, motoring and generating regions, Effect of voltage and frequency variations on Induction motor performance, Losses and efficiency, Power stages, No load and block rotor test, Circle diagram, Applications of 3Φ IM.

400 Three Phase Induction Motors- Speed Control and Starting:

- Speed control methods including V/f method (excluding Slip power recovery scheme),
- Starting methods,
- High torque motors,
- Cogging and crawling,
- Basic principle of Induction Generator

500 Single Phase Induction Motor-introduction

- Principle of operation,
- Double field revolving theory,
- Equivalent circuit of single phase induction motor,
- Determination of equivalent circuit parameters from no load and block rotor test.

600 Single Phase Induction Motor- Starting Methods

- Staring methods, Split phase starting- Resistance spilt phase, capacitor split phase,
- capacitor start and run, shaded pole starting,
- Reluctance starting. Calculation of capacitor at starting.
- Applications of 1ΙΈ IM

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