1. ELECTROMAGNETISM:
Review of electromagnetism, Magnetic field strength, Magnetic force.
2. MAGNETIC CIRCUITS:
Magneto motive force , reluctance, laws of magnetic circuits , determination of ampere-turns for series and
parallel magnetic circuits , magnetic leakage and fringing, hysteresis and eddy current losses.
3. ELECTROMAGNETIC INDUCTION:
Faraday's laws, Lenz's law, statically and dynamically induced E.M.F., Energy stored in magnetic field.
4. TRANSFORMERS:
Introduction, Principle of working, construction of single phase transformer, EMF equation, phasor diagram
on no-load, leakage reactance, transformer on load, equivalent circuit, voltage regulation, power and energy
efficiency, open circuit and short circuit tests, equivalent circuit parameters estimation.
Effect of saturation on exciting current, in-rush current phenomenon.
Parallel operation of single phase transformer.
5. AUTO TRANSFORMER:
Principle of operation, comparison with two winding transformers.
6. THREE-PHASE TRANSFORMERS:
Different winding connections, Voltage and current ratios, comparative features, effect of connections on
exciting current,
Parallel operation.
Three winding transformer-equivalent circuit, off-load and on-load tap changing transformer, Scott
connections.