Basic Electrical Machines1. Unit-1
2. Unit-2
3. Unit-3
4. Unit-4
5. Unit-5
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Basic Electrical Machines SyllabusUnit –1Analysis of Transformers Revision of transformer fundamentals, Excitation phenomenon in transformers, switching transients, autotransformers, equivalent circuit, phasor diagram, three phase transformers, phase groups, different connections, three winding transformers, equivalent circuit. Unit-2 Operation of Transformers Parallel operation of transformers, connection from three phase to two phase, single phase and six phases, open delta operation, back to back test, separation of losses, on load tap changing. Unit-3 Principles of DC Machines Construction of DC machine, Blv and Bli concepts, voltage and torque productions in DC generator and DC motor, generated emf equation, generated torque equation, armature reaction in generator and motor, flux and mmf distribution, effect of brush shift, compensating winding commutation, methods of attaining linear commutation. Unit-4 Principles of DC Machines Types of DC generator, conditions of self-excitation, operating characteristics of DC generators, types of DC motors, characteristics of DC motors, starters of DC shunt and series motors, methods of speed control, losses and efficiency of DC machines. Unit-5 Testing of DC Machines Swinburns test, Hopkinsons test, retardation test, field test, separation of losses, plugging, dynamic breaking, regenerative breaking, DC machine applications, parallel operation of DC shunt and series generators. |