CHHATTISGARH SWAMI VIVEKANAND TECHNICAL UNIVERSITY BHILAI (C.G.)
Semester :III Branch: Electrical & Electronics Engg.
Subject:Basic Electrical Machines
Unit –1 Analysis 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
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
Text Books for DC Machines
1. Electric Machines-I.J. Nagrath D.P. Kothari
2. Performance and design of DC machines-A.E. Claytor and Hancock
Text Book for Transformers
1. Performance and Design of AC Machines – M.G. Say
2. Electric Machines-I.J. Nagrath D.P. Kothari
Reference Books :
1. Electrical Machinery – Dr. P.S. Bhimbhara