Handout

BIRLA INSTITUTE OF TECHNOLOGY AND SCIENCE, Pilani Pilani Campus INSTRUCTION DIVISION FIRST SEMESTER 2012-2013 Course Handout (Part II) Date: 02/08/2013 In addition to part-I (General Handout for all courses appended to the time table) this portion gives further specific details regarding the course. Course No. Course Title Instructor-in charge Team of Instructors

: EEE F211/INSTR F211 : Electrical Machines : HITESH DUTT MATHUR : Dheerendra Singh, Hari Om Bansal, Srinivas Reddy, Aishwarya Pandey, Jitendra, Yogesh Krishan.

1. Course Description : Theory, performance, testing, applications and control of DC machines, induction machines, synchronous machines and transformers. Experiments on testing and control of machines and transformers. Fractional HP motors and miniature motors. 2. Scope and objective of the Course : Thorough knowledge of principle and working of machines like transformers, dc machines, synchronous machines and induction machines. Parameters governing performance and factors influencing control during normal and extreme working conditions shall be made known to the students. 3. Text Book : 1. Nagrath I J and D P Kothari - Electric Machines - TMH, 4th ed., 2010. 2. Electrical Machines Laboratory Manual by Nagrath I.J & M.R. Poonkuzhali (EDD Notes), 1998. 4. Reference Books : 1. 2. 3.

M.G. Say – Performance and Design of AC machines –Pitman P.S. Bimbhra, Electrical Machinary, Khanna Publishers P.S. Bimbhra, Generalized Theory of Electrical machines, Khanna Publishers

5. Course Plan : Lec. No.

Learning Objectives

Topic to be Covered

References

1-2

To review Transformer

Construction, operation, equivalent circuit, phasor diagrams, losses, efficiency and voltage regulation

3.1 to 3.9 of T1/ 1.1 to 1.12 of R2

3-4

To learn three phase transformer operation

Connections, Phasor groups, Applications and Harmonics

3.13 of T1/ 8.1 to 8.2 and 8.4.1 to 8.4.4 of R3

5-6

To learn parallel transformers

Parallel operation and load sharing

3.14 of T1 / 1.13 of R2

7

To learn about phase conversions

Three phase to two phase conversions ( Scott connection)

3.16 of T1/ 8.9 of R3

8

To learn excitation phenomenon in transformers

Excitation phenomenon

3.10 of T1/ 8.4 of R3

9

To learn about transformers

No load and On load tap changers

3.17 of T1 / 1.14 of R2

operation

tap

changers

of

in

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BIRLA INSTITUTE OF TECHNOLOGY AND SCIENCE, Pilani Pilani Campus 10

Transformer transformers

testing

&

11-12

3 phase Auto-transformer

Star and delta connection

3.11 of T1 and 8.12.1-8.12.2 of R3

13

To review DC machines

Construction, EMF and Torque, Commutation

7.1-7.11 of T1

14

To review DC motors characteristics

Shunt, series & compound motors

7.12 of T1

15

Starting of DC motors

Shunt motor starter step calculation

7.13 of T1

16

Braking of DC motors & applications

Plugging, dynamic & regenerative braking

7.15 of T1

17

Performance machines

Efficiency & testing of DC machines

7.16 of T1/ 4.14 of R2

18-19

To learn about synchronous machines

Operation, circuit model, armature reaction, synchronous reactance, determination of synchronous impedance

8.5 to 8.6 (Review of 8.1 -8.4) of T1

20

To learn about synchronizing and operating characteristics of synchronous machine

Review of Synchronizing to infinite bus bar, operating characteristics, power angle characteristics, operation at constant load with variable excitation, compounding curves, synchronous condensor, armature resistance

8.7 to 8.8 of T1

21-22

To learn about Power transfer in a synchronous generator

Power flow equation, capability curve

8.9-8.10 of T1

23-25

Two reaction theory in salient pole synchronous machine

Two reaction model, phasor diagram, power angle characteristics and slip test

8.11 of T1

26-29

Parallel operation and dynamics

Parallel operation, hunting phenomena, short circuit transients.

8.12-8.14 of T1

30-31

To learn basic principle of phase Induction Machines

3-

Construction, MMF wave, Slip and frequency of rotor currents

9.1 to 9.3 of T1

32-33

To learn modeling of 3phase Induction Motor

Circuit model, Power across air gap, Torque and power output, Torque slip characteristics

9.4, 9.5 of T1

34-36

To learn about testing of 3-phase Induction motor

No-Load and short circuit tests, determination of parameters, circle diagram, starting, speed control

9.6 to 9.10 of T1/ 6.10 to 6.11 of R2

37-38

To review basics of induction motor

Operation & characteristics of single phase induction motor

10.1 to 10.2 of T1/ 6.1 to 6.2 of R3

39-40

Special Machines

Types and their applications

Class Notes

evaluation

special

of

DC

single phase

Sumpner’s test, transformer

frequency

response,

6. LABORATORY COMPONENT: The list of experiments to be performed is as follows 1. Open circuit & Short circuit tests on a single phase transformer. 2. No load tests on a DC shunt motor 3. Open circuit and Short circuit tests on a Synchronous machine 4. No load tests on a DC Shunt generator 5. Load test on a DC shunt generator 6. Sumpner’s test & Scott connection 7. Hopkinson’s test


pulse

3.7 of T1, Appendix III of T1

BIRLA INSTITUTE OF TECHNOLOGY AND SCIENCE, Pilani Pilani Campus 8. load test on a Synchronous machine (motor) 9. No load and load test on a three phase induction motor 10. Test on a single phase induction motor Each experiment (performance & evaluation) is of 2.5 marks. In the end there will be a lab test of 40 marks. Other working details will be provided in the lab. 7. Evaluation Scheme: Component

Duration

Weightage

Date & Time

Remarks

Midsem Test

90 Min

75(25%)

30/9 4:00 - 5:30 PM

CB

Quiz Experiments Lab Test

50 Min

To be announced

2 Hrs

40(13.33%) 10x2.5=25 (8.33%) 40(13.33%)

To be announced

CB OB OB

Comprehensive Exam.

3 hours

120 (40%)

7/12 AN

OB and CB

8. Chamber Consultation Hour: To be announced in the class. 9. Notices: Notices concerning this course will be displayed on CMT/EEE Notice Board. Instructor-in-charge EEEC371/INSTR C371
