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.
- Introduction to supply and distribution (6 hours)
- Introduction to electrical supply & distribution
- Introduction to electrical installation
- Wiring material and accessories
- Control & protection
- Earthing of installation
- Electrical measurements (2 hours)
- Introduction
- Electrical measuring instruments
- Electrical maintenance & safety ( 4 hours)
- Electric shocks, effect & precaution
- Electrical maintenance and care
- Safe use of electricity
- Electromagnetism (4 hours)
- Introduction
- Magnetic field due to electric current
- Force on current carrying conductor
- Force between parallel conductor
- Torque experienced by the coil
- Electromagnetic induction
- Statically & Dynamically induced EMF
- Magnetic circuits (3 hours)
- Introduction
- Magneto motive force
- Magnetic circuit theory
- Self & mutual inductance
- Transformer (7 hours)
- Introduction
- Working principle of transformer
- Transformer construction
- Types of transformer
- Transformer at load and no load condition
- Voltage regulation of a transformer
- Types of losses and Efficiency of a transformer
- Three-phase transformer
- Generators (6 hours)
- Introduction
- Construction of generator
- Operating principle of generator
- EMF equation
- Types of generator
- Uses of different types of generator
- Generator ratings
- Diesel generator set use and maintenance
- D.C. motors (4 hours)
- Introduction
- Working principle of d.c. motor
- Construction of d.c. motor
- Types of d.c. motor and their uses
- D.C. motor connection
- A.C. motors (5 hours)
- Introduction
- Operating principle of induction motor
- Construction of induction motor
- Connection for starting, reversing and speed changing of 3-phase induction motor
- Methods of power factor improvement
- Synchronous motors
- Single phase motors (2 hours)
- introduction
- AC series motor
- Universal motor
- Stepper motor
- Application of single phase motors
- Selection of Electric motors (2 hours)
- Electric Characteristics
- Types of Enclosures
- Size and Ratings
- Estimation of Motor Ratings
Practical:
- Load test on a single phase transformer
- To determine the polarity of the primary and secondary winding
- To find the turns-ratio
- To determine the efficiency at different loads
- To determine the voltage regulation
- Open circuit and short circuit test on a single phase tansformer
- To find efficiency at various load
- To find the load at which efficiency is maximum
- To calculate the voltage regulation at full load at p.f. i) 0.85 lagg and ii) 0.85 lead.
- Study of constructional details and starting of d.c. machine
- To study the constructional features of a d.c. machine
- To measure winding resistance
- To start and reverse the direction of the rotation of a d.c. motor
- Speed control of a d.c. shunt motor
- To plot the speed versus field current characteristics curve for a d.c shunt motor
- To plot the speed versus armature voltage characteristics curve for a d.c. shunt motor
- Three-phase induction motor starter
- To study the various types of three-phase induction motor starter
- Auto-transformer starter
- Star-delta starter
- DOL starter
- Load test on three phase induction motor
- Compute, torque, output power, input power, efficiency, input power factor and slip for various load settings
- To plot the following curves from the data obtained in part (6.1)
- Efficiency vs output power
- Torque vs output power
- Line current vs output power
- Power factor vs output power
- Slip vs output power
References
- D.C. Kulshreshtha “Basic Electrical Engineering” Tata McGraw Hill Private limited, New Delhi 2010
- B.R.Gupta & Vandana Singhal “ Fundamentals of Electric Machines” New age international publishers, New Delhi 2005
- 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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