Electric System and Machines

Course Objective:
After completion of this course the student will be able to understand the fundamentals of electrical supply, measurement, safety, protection and machines. 

  1. Introduction to supply and distribution  (6 hours)
    1.  Introduction to electrical supply & distribution
    2. Introduction to electrical installation
    3. Wiring material and accessories
    4. Control & protection
    5. Earthing of installation
  1.  Electrical measurements  (2 hours)
    1. Introduction
    2. Electrical measuring instruments
  1. Electrical maintenance & safety  ( 4 hours)
    1. Electric shocks, effect & precaution
    2. Electrical maintenance and care
    3. Safe use of electricity
  1. Electromagnetism  (4  hours)
    1. Introduction
    2. Magnetic field due to electric current
    3. Force on current carrying conductor
    4. Force between parallel conductor
    5. Torque experienced by the coil
    6. Electromagnetic induction
    7. Statically &  Dynamically induced EMF
  1. Magnetic circuits  (3 hours)
    1. Introduction
    2. Magneto motive force
    3. Magnetic circuit theory
    4. Self & mutual inductance
  1. Transformer  (7 hours)
    1. Introduction
    2. Working principle of transformer
    3. Transformer construction
    4. Types of transformer
    5. Transformer at load and no load condition
    6. Voltage regulation of a transformer
    7. Types of losses and Efficiency of a transformer
    8. Three-phase transformer
  1. Generators  (6 hours)
    1. Introduction
    2. Construction of generator
    3. Operating principle of generator
    4. EMF equation
    5. Types of generator
    6. Uses of different types of generator
    7. Generator ratings
    8. Diesel generator set use and maintenance
  1. D.C. motors  (4 hours)
    1. Introduction
    2. Working principle of d.c. motor
    3. Construction of d.c. motor
    4. Types of d.c. motor and their uses
    5. D.C. motor connection
  1. A.C. motors  (5 hours)
    1. Introduction
    2. Operating principle of induction motor
    3. Construction of induction motor
    4. Connection for starting, reversing and speed changing of 3-phase induction motor
    5. Methods of power factor improvement
    6. Synchronous motors
  2. Single phase motors  (2 hours)
    1. introduction
    2. AC series motor
    3. Universal motor
    4. Stepper motor
    5. Application of single phase motors
  1. Selection of Electric motors  (2 hours)
    1. Electric Characteristics
    2. Types of Enclosures
    3. Size and Ratings
    4. Estimation of Motor Ratings

Practical:

  1.  Load test on a single phase transformer
    1. To determine the polarity of the primary and secondary winding
    2. To find the turns-ratio
    3. To determine the efficiency at different loads
    4. To determine the voltage regulation
  2. Open circuit and short circuit test on a single phase tansformer
    1. To find efficiency at various load
    2. To find the load at which efficiency is maximum
    3. To calculate the voltage regulation at full load at p.f. i) 0.85 lagg and ii) 0.85 lead.
  3. Study of constructional details and starting of  d.c. machine
    1. To study the constructional features of a d.c. machine
    2. To measure winding resistance
    3. To start and reverse the direction of the rotation of a d.c. motor
  4. Speed control of a d.c. shunt motor
    1. To plot the speed versus field current characteristics curve for a d.c shunt motor
    2. To plot the speed versus armature voltage characteristics curve for a d.c. shunt motor
  5. Three-phase induction motor starter
    1. To study the various types of three-phase induction motor starter
      1. Auto-transformer starter
      2. Star-delta starter
      3. DOL starter
  6. Load test on three phase induction motor
    1. Compute, torque, output power, input power, efficiency, input power factor and slip for various load settings
    2. To plot the following curves from the data obtained in part (6.1)
      1. Efficiency vs output power
      2. Torque vs output power
      3. Line current vs output power
      4. Power factor vs output power
      5. Slip vs output power

References

  1. D.C. Kulshreshtha “Basic Electrical Engineering” Tata McGraw Hill Private limited, New Delhi 2010
  2. B.R.Gupta & Vandana Singhal “ Fundamentals of Electric Machines” New age international publishers, New Delhi 2005
  3. Dr. N.K. Jain “ A text book of practical in Electrical Engineering”, Dhanpat Rai Publishing Company,New Delhi 2002

Evaluation Scheme:
The questions will cover all the chapters of the syllabus. The evaluation scheme will be as indicated in the table below:

Chapters

Hours

Marks distribution*

1

6

12

2 & 3

6

12

4 & 5

7

12

6

7

12

7

6

8

8

4

8

9

5

8

10 & 11

4

8

Total

45

80


*Note: There may be minor deviation in marks distribution.

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