.
1. Title of subject
Introduction to Machines and Power Systems
2. Subject code
EPM1076
3. Credit Hour
3
4. Pre-Requisite
ECT1016 Circuit Theory
5. Aim of Subject
To introduce the basic concepts and working principles of electrical
machines.
To introduce the basic concepts of the electrical power system and its
protection.
6. Learning Outcomes
and Program
Outcomes of Subject
At the completion of the subject, students should be able to :
Learning Outcomes:
• LO1 – Distinguish the characteristics and mechanisms of
transformers and other rotating electrical machines
(Cognitive–Analyzing–Level 4)
• LO2 – Analyze three-phase circuits in electrical machines and
power systems (Cognitive–Analyzing–Level 4 )
• LO3 – Explain the principles of operation and constructional
features of transformers, DC machines, induction machines
and synchronous machines (Cognitive–Understanding–Level
2)
• LO4 – Analyse the behaviour and performances of electrical
machines and power systems (Cognitive–Analyzing–Level 4)
• LO5 – Describe the components of electrical power systems
(Cognitive–Understanding–Level 2)
• LO6 – Interpret the feasibility of various fault detecting
methods and protective devices in the basic protection
schemes of electrical power systems (Cognitive–Applying–
Level 3)
Programme Outcomes:
• PO1 – Acquire and apply knowledge of mathematics, science
and engineering fundamentals
7. Assessment
Scheme
Lab
Experiments
Tutorial /
Assignment
•
•
•
•
•
•
Work in group
Lab report writing
Oral assessment at the end of
lab
Group assignment
Focus group discussion
To enhance understanding of
basic concepts in lecture
10%
15%
.
8. Details of Subject
Test
•
Written exam
15%
Final Exam
•
Written exam
60%
Topics
Hours
Introduction to Machinery Principles
Introduction to electrical machines and transformers.
Rotational motion, Newton's law, and power
relationships. Magnetic field, Faraday’s law, induced
voltage on a conductor moving in a magnetic field,
production of force on a wire in a magnetic field.
3
Three-phase Circuits
Three-phase systems. Relation between line and
phase quantities. Analysis of balanced three-phase
circuits. Y-∆ transformation. Power, reactive power
and complex power calculations.
5
Transformers
Single-phase transformers: Construction, principle of
operation and equivalent circuit, phasor diagram,
efficiency and regulation. Short and open circuit
tests. Parallel operation.
Three-phase transformers: Construction and
connections. Introduction to autotransformers and
instrument transformers.
6
D.C. and A.C. Machines
D.C. Machines
Principles of operation and construction of DC
machines, Emf equation and principle of
commutation. Types of DC generators. DC motors:
Torque equation, characteristics of shunt, series and
compound motors. Starting and speed control.
Losses and efficiencies of DC machines.
Induction Machines
Principles of operation and basic construction of
three-phase induction motor. Slip equation,
equivalent circuit, determination of equivalent circuit
parameters by no-load and blocked-rotor tests.
Torque-speed characteristics.. Starting methods.
Introduction to single-phase induction motors.
Synchronous Machines
Principle of operation of Synchronous generators,
Synchronous impedance and simple equivalent
circuit.. Voltage regulation. Synchronizing procedures
and parallel operation of synchronous machines.
12
.
Introduction to Power System
Generation of electrical power: Various types of
conventional and non-conventional generation plants
Single-line diagram and impedance diagram of
power systems. Per-unit quantities. Components of a
power system: Generation, Transmission and
Distribution
6
Basic Protection
Objective of power system protection. Basic
principles and components of protection including
fuses. Operating principles of overcurrent relays.
Instantaneous and time grading relays. Safety
grounding, Grounding practice in power systems and
electrical installations
4
9. Teaching and
Learning Activities
The subject will be delivered using the following means:
• Lecture hours = 36
• Supervised Tutorial Hours = 8
• Laboratory Hours = 6
Total Contact Hours = 50
10. Laboratory
1.
2.
11. Reading Material
Equivalent circuit determination and load test on single-phase
transformer
Load test on induction motor
Textbook
1. S.J. Chapman, “ Electric Machinery and Power
System Fundamentals”, 1st edition McGraw Hill
Higher Education, 2002
Reference
Materials
1. T. Wildi, “Electrical Machines, Drives, and
Power Systems”, Sixth edition, Prentice-Hall,
Inc., 2005
2. B.S. Guru and H.R. Hiziroglu, “Elecgrcial
Machinery and Transformers”, 3rd edition,
Oxford University Press, 2001
3. J.J. Grainger and W.D. Stevenson, Jr. “Power
System Analysis”, McGraw-Hill, 2004
4. B.M. Weedy and B.J. Cory, “Electric Power
Systems”, Fifth edition, John Wiley & Sons,
2012