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Subject Details

Dept : EEE

Sem : 3

Regul : R2023

Faculty : Mr.T.Tharankumar

phone : NIL

E-mail : tharan.engineer@gmail.com

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Lecture Notes

UNIT 1:

Constructional features of a DC machines

Principles of operation of DC generator

DC Generator types and methods of excitation

no load and load characteristics of DC generators

EMF equation

armature reaction and commutation

UNIT 2:

back EMF â€“ torque equation

Principles of operation of DC motor

Types of DC motor

speed control

starting methods

characteristics of DC motors

UNIT 3:

Losses and efficiency

Testing of DC machines

Brake test of DC Motor

Swinburneâ€™s Test

Applications of DC Machines

Hopkinson’s tests

UNIT 4:

Principles of operation

constructional features of single phase and three phase transformers

EMF equation â€“ transformer on no load and load

effects of resistance and leakage reactance of the windings

phasor diagram of transformer

equivalent circuit â€“ regulation

UNIT 5:

Auto transformer

three phase transformers connections

Tap changing. Applications: Instrument, Isolation, Distribution and Power Transformers

polarity test

open circuit and short circuit tests

Losses and efficiency â€“ all day efficiency

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