IIT Kharagpur Course , Prof. Debaprasad Kastha

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IIT Kharagpur Course , Prof. Debaprasad Kastha

Contents:

Fundamentals of single phase transformers : Introduction; Basics of magnetic circuits, Amperes law, linear and nonlinear magnetic circuits; Faradays law of electromagnet induction - Concept of an ideal transformer, assumptions; ideal transformer at no load and on load, phasor diagram, voltage current and power relations; basic construction of a practical single phase transformer, conceptual differences with an ideal transformer - Constructional details of a practical single phase transformer, core, winding,insulation and cooling methods; circuit model of a practical transformer incorporating an ideal transformer - Analysis of a practical single phase transformer, exact and approximate equivalent circuits, phasor diagram, relation between referred variables and parameters, per unit system of representation - Worked out examples, question - answer session.

Testing and performance of single phase transformers : Experimental determination of single phase transformer equivalent circuit parameters, Open circuit and short circuit tests, per unit parameters; worked out example - Percentage regulation of a single phase transformer, phasor diagram, derivation, per unit representation; worked out example - Efficiency of a single phase transformer, maximum efficiency, all day efficiency; Sumpners test for experimental determination of a single phase transformer efficiency - Worked out examples, question - answer session.

Fundamentals of three phase transformers : Bank of three single phase transformers, voltage, current and kVA rating with different connections, open . connection; worked out example - Three phase transformer as a single unit; constructional features, three limb,five limb, core type and shell type constructions; comparison with bank of three single phase transformers - Three phase transformer connections, polarity and terminal convention,vector groups; Y/Y and ./. connections, connection and phasor diagram,per phase equivalent circuit based analysis - Y/.and ./Y connections. Connection and phasor diagrams, per phaseequivalent circuit based analysis; worked out examples - Y/Z and ./Z connections. Connection and phasor diagrams, voltage,current relations.

Operation and performance of three phase transformers : Tap changing transformer - Parallel operation of single and three phase transformers, conditions and connection diagrams, per phase equivalent circuit based analysis with equal and unequal no load voltages, load sharing - Harmonics and switching transients in transformers, effect of transformer connections, inrush current - Worked out examples, question - answer session.

Special purpose transformers : Single and three phase three winding transformer, equivalent circuit, phasor diagram, tests - Single and three phase autotransformers, advantages, equivalent circuit and phasor diagram - Three phase to two phase conversion using Scott connection, connection and phasor diagram, analysis with balanced and unbalanced loads - Worked out examples, question - answer session.

Construction and operating principle of three phase induction machines : Basic constructional features of round rotor polyphase ac machines. Airgap mmf and flux waveforms due to single phase distributed winding - Airgap mmf and flux waveform in round rotor machines due to balanced three phase distributed winding excited by balanced three phase alternating current, rotating magnetic field - Generated voltage and torque expression in three phase round rotor ac machine with distributed winding - Construction and types of three phase induction machines, wound rotor and squirrel cage induction machines; representation of the squirrel cage by a balanced three phase winding - Basic operating principle, motoring and generating mode of operation, generated rotor voltage, synchronous speed, slip speed, per unit slip.

Analysis of three phase induction machines : Exact and approximate per phase equivalent circuit; phasor diagram under no load and loaded condition - Power flow diagram in a three phase induction machine, airgap power, slip power, mechanical power; torque-slip and current-slip characteristics - Starting torque, breakdown slip, breakdown torque, maximum mechanical power, effect of equivalent circuit parameters - Worked out examples, question - answer session.

Testing of three phase induction machines : No load and blocked rotor tests for determining equivalent circuit parameters; losses and efficiency - Induction machine performance computation from circle diagram - Cogging torque and crawling; induction machines with deep bar and double cage rotors - Worked out examples, question - answer session.

Starting and speed control of three phase induction machines : Direct on line starting, stator resistance and reactance based starting, rotor resistance based starting - Y/. and auto transformer based starting; worked out examples - Speed control of induction motors by stator voltage variation and pole changing techniques - Variable frequency speed control of induction machines, v/f control method, slip power control method - Worked out examples, question - answer session.

Fundamentals of single phase transformers : Introduction; Basics of magnetic circuits, Amperes law, linear and nonlinear magnetic circuits; Faradays law of electromagnet induction - Concept of an ideal transformer, assumptions; ideal transformer at no load and on load, phasor diagram, voltage current and power relations; basic construction of a practical single phase transformer, conceptual differences with an ideal transformer - Constructional details of a practical single phase transformer, core, winding,insulation and cooling methods; circuit model of a practical transformer incorporating an ideal transformer - Analysis of a practical single phase transformer, exact and approximate equivalent circuits, phasor diagram, relation between referred variables and parameters, per unit system of representation - Worked out examples, question - answer session.

Testing and performance of single phase transformers : Experimental determination of single phase transformer equivalent circuit parameters, Open circuit and short circuit tests, per unit parameters; worked out example - Percentage regulation of a single phase transformer, phasor diagram, derivation, per unit representation; worked out example - Efficiency of a single phase transformer, maximum efficiency, all day efficiency; Sumpners test for experimental determination of a single phase transformer efficiency - Worked out examples, question - answer session.

Fundamentals of three phase transformers : Bank of three single phase transformers, voltage, current and kVA rating with different connections, open . connection; worked out example - Three phase transformer as a single unit; constructional features, three limb,five limb, core type and shell type constructions; comparison with bank of three single phase transformers - Three phase transformer connections, polarity and terminal convention,vector groups; Y/Y and ./. connections, connection and phasor diagram,per phase equivalent circuit based analysis - Y/.and ./Y connections. Connection and phasor diagrams, per phaseequivalent circuit based analysis; worked out examples - Y/Z and ./Z connections. Connection and phasor diagrams, voltage,current relations.

Operation and performance of three phase transformers : Tap changing transformer - Parallel operation of single and three phase transformers, conditions and connection diagrams, per phase equivalent circuit based analysis with equal and unequal no load voltages, load sharing - Harmonics and switching transients in transformers, effect of transformer connections, inrush current - Worked out examples, question - answer session.

Special purpose transformers : Single and three phase three winding transformer, equivalent circuit, phasor diagram, tests - Single and three phase autotransformers, advantages, equivalent circuit and phasor diagram - Three phase to two phase conversion using Scott connection, connection and phasor diagram, analysis with balanced and unbalanced loads - Worked out examples, question - answer session.

Construction and operating principle of three phase induction machines : Basic constructional features of round rotor polyphase ac machines. Airgap mmf and flux waveforms due to single phase distributed winding - Airgap mmf and flux waveform in round rotor machines due to balanced three phase distributed winding excited by balanced three phase alternating current, rotating magnetic field - Generated voltage and torque expression in three phase round rotor ac machine with distributed winding - Construction and types of three phase induction machines, wound rotor and squirrel cage induction machines; representation of the squirrel cage by a balanced three phase winding - Basic operating principle, motoring and generating mode of operation, generated rotor voltage, synchronous speed, slip speed, per unit slip.

Analysis of three phase induction machines : Exact and approximate per phase equivalent circuit; phasor diagram under no load and loaded condition - Power flow diagram in a three phase induction machine, airgap power, slip power, mechanical power; torque-slip and current-slip characteristics - Starting torque, breakdown slip, breakdown torque, maximum mechanical power, effect of equivalent circuit parameters - Worked out examples, question - answer session.

Testing of three phase induction machines : No load and blocked rotor tests for determining equivalent circuit parameters; losses and efficiency - Induction machine performance computation from circle diagram - Cogging torque and crawling; induction machines with deep bar and double cage rotors - Worked out examples, question - answer session.

Starting and speed control of three phase induction machines : Direct on line starting, stator resistance and reactance based starting, rotor resistance based starting - Y/. and auto transformer based starting; worked out examples - Speed control of induction motors by stator voltage variation and pole changing techniques - Variable frequency speed control of induction machines, v/f control method, slip power control method - Worked out examples, question - answer session.

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3.2 (375 Ratings)

Electrical Machines-I by Prof. Debaprasad Kastha, Department of Electrical Engineering, IIT Kharagpur. For more details on NPTEL visit httpnptel.iitm.ac.in

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- 1.Mod-01 Lec-01 Lecture-01-Introduction
- 2.Mod-01 Lec-02 Lecture-02-Operating Principles and Construction of Single Phase Transformers
- 3.Mod-01 Lec-03 Lecture-03-Modeling of Single Phase Transformers
- 4.Mod-01 Lec-04 Lecture-04-Equivalent Circuits of Single Phase Transformers
- 5.Mod-01 Lec-05 Lecture-05-Testing of Single Phase Transformers
- 6.Mod-01 Lec-06 Lecture-06-Efficiency of Single Phase Transformers
- 7.Mod-01 Lec-07 Lecture-07-Voltage Regulation of Single Phase Transformers
- 8.Mod-01 Lec-08 Lecture-08-Parallel Operation of Single Phase Transformers
- 9.Mod-01 Lec-09 Lecture-09-Harmonics and Switching Transients in Single Phase Transformers
- 10.Mod-01 Lec-10 Lecture-10-Introduction to Three Phase Transformer
- 11.Mod-01 Lec-11 Lecture-11-Construction of Three Phase Transformers
- 12.Mod-01 Lec-12 Lecture-12-Three Phase Transformer Connections
- 13.Mod-01 Lec-13 Lecture-13-Three Phase Transformer Phase Groups Part - I
- 14.Mod-01 Lec-14 Lecture-14-Three Phase Transformer Phase Groups Part - II
- 15.Mod-01 Lec-15 Lecture-15-Analysis and Testing of Three Phase Transformers
- 16.Mod-01 Lec-16 Lecture-16-Operation of Three Phase Transformers
- 17.Mod-01 Lec-17 Lecture-17-Auto Transformers
- 18.Mod-01 Lec-18 Lecture-18-Three Winding Transformers
- 19.Mod-01 Lec-19 Lecture-19-Scott Connected Transformers
- 20.Mod-01 Lec-20 Lecture-20-Potential and Current Transformers
- 21.Mod-01 Lec-21 Lecture-21-Operating Principles of DC Machines
- 22.Mod-01 Lec-22 Lecture-22-Constructional Features of DC Machines
- 23.Mod-01 Lec-23 Lecture-23-Generated EMF and Torque in DC Machines
- 24.Mod-01 Lec-24 Lecture-24-Armature Reaction
- 25.Mod-01 Lec-25 Lecture-25-Commutation in DC Machines
- 26.Mod-01 Lec-26 Lecture-26-Separately Excited DC Generators
- 27.Mod-01 Lec-27- Lecture-27-DC Shunt Generators
- 28.Mod-01 Lec-28 Lecture-28-Compound DC Generators
- 29.Mod-01 Lec-29 Lecture-29-Interconnected DC Generators
- 30.Mod-01 Lec-30 Lecture-30-Characteristics of DC Shunt Motors
- 31.Mod-01 Lec-31 Lecture-31-Starting of DC Shunt Motors
- 32.Mod-01 Lec-32 Lecture-32-Speed Control of DC Shunt Motors
- 33.Mod-01 Lec-33 Lecture-33-Braking of DC Shunt Motors
- 34.Mod-01 Lec-34 Lecture-34-Electronic Control of DC Shunt Motors
- 35.Mod-01 Lec-35 Lecture-35-Testing of DC Shunt Motors
- 36.Mod-01 Lec-36 Lecture-36-Characteristics of DC Series Motors
- 37.Mod-01 Lec-37 Lecture-37-Starting and Braking of DC Series Motors
- 38.Mod-01 Lec-38 Lecture-38-Speed Control and of DC Series Motors
- 39.Mod-01 Lec-39 Lecture-39-Testing of DC Series Motors
- 40.Mod-01 Lec-40 Lecture-40-Characteristics of Compound DC Series Motors

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