Syllabus of GTU Electrical Machine 3rd Sem EC

Syllabus of GTU Electrical Machine 3rd Sem EC


Electronics and Communication Engineering

B.E Semester: 3


Subject Code 131701

Subject Name Electrical Machine


1 Transformers:

Single Phase Transformer:

Working principle, Construction, types, EMF equation, Transformer losses,

effect of load, magnetic and resistive leakage, equivalent circuit,

transformer testing, regulation of transformer, transformer efficiency, effect

of power factor variation on efficiency, auto transformer.

Three Phase Transformer:

connections, Power supplied by V – V bank, Three – phase to Two-phase

conversion, Two – phase to Three – phase conversion, Parallel operation of

three – phase transformers, Instrument transformers, Current transformers,

Potential transformers


2 Principles of Electromagnetic Energy Conversion:

Forces and Torques in Magnetic Field Systems; Singly Excited and Multiply

Excited Field Systems; Elementary Concepts of Rotating Machines; Losses

and efficiency, ventilation and cooling, machine ratings, leakage and

harmonic fluxes


3 Induction Machines:

Constructional features of poly-phase induction machines; Stator and

Rotating Magnetic Field; Torque production; Slip; Equivalent circuit of a

Polyphase Induction Machine; equivalent circuit from test data; Threephase

induction machine performance; Torque-Slip characteristic; Circle

diagram; Speed control of Polyphase induction motors, Starting methods for

polyphase induction motors; Induction generator, Cogging and crawling;

Single-phase induction motors; No-load and Blocked-rotor test; Starting

methods for single-phase induction motors; Application


4 Synchronous Machines:

Constructional features of synchronous machines; Elementary synchronous

machine; Equivalent circuit of a synchronous machine, Voltage regulation;

Power – angle and other performance characteristics; Effect of Saliency;

Determining reactance by test data; Parallel operation of interconnected

synchronous generators; Steady – state stability; Excitation systems;

Hunting and damper winding; Applications


5 Direct-Current Machines:

Constructional features of DC machines; Elementary DC machine; Methods

of excitation of DC machines; Equivalent circuit of DC machine;

Commutator action; Armature reaction; Interpoles and compensating

windings; Magnetization characteristic of a DC machine; Characteristics of

a separately excited DC generator; Self excitation; Characteristic of a DC

shunt generator; Characteristic of a DC series generator; Characteristic of a

DC compound generator; DC motor characteristics; Control of DC motors;

Testing and efficiency; Applications


Reference Books:

1. Electrical machines; Mulukutla S. Sharma, and Mikesh K. Pathak; Cengage Publication

2. A Text of Electrical Technology; B. L. Theraja, and A. K. Theraja; S. Chand Publication

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