BE3254 – NOTES & QP
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BE3254 – SYLLABUS
UNIT I TRANSFORMER
Introduction – Ideal and Practical Transformer – Phasor diagram-– Per Unit System – Equivalent circuit- Testing- Efficiency and Voltage Regulation– Three Phase Transformers –Applications- Auto Transformers, Advantages- Harmonics.
UNIT II DC MACHINES
Introduction – Constructional Features– Motor and Generator mode – EMF and Torque equation – Circuit Model – Methods of Excitation- Characteristics – Starting and Speed Control – Universal Motor- Stepper Motors – Brushless DC Motors- Applications
UNIT III AC ROTATING MACHINES
Principle of operation of three-phase induction motors – Construction –Types – Equivalent circuit, Speed Control – Single phase Induction motors -Construction– Types–starting methods. Alternator: Working principle–Equation of induced EMF – Voltage regulation, Synchronous motors- working principle-starting methods – Torque equation.
UNIT IV MEASUREMENTS AND INSTRUMENTATION
Functional elements of an instrument , Standards and calibration, Operating Principle , types – Moving Coil and Moving Iron meters, Measurement of three phase power, Energy Meter, Instrument Transformers-CT and PT,DSO- Block diagram- Data acquisition.
UNIT V BASICS OF POWER SYSTEMS
Power system structure -Generation , Transmission and distribution , Various voltage levels, Earthing – methods of earthing, protective devices- switch fuse unit- Miniature circuit breaker- moulded case circuit breaker- earth leakage circuit breaker, safety precautions and First Aid