
Introduction
to Power System
Subject Code: 
EPM3046 
Aim of Subject: 
To introduce the basic concepts of electric power systems, in particular discuss the operation, control and protection of power systems. 
Learning Outcome of Subject: 
At the completion of the subject, students should be able to:
 Understand the basics of various types of electric power generation plants.
 Apply the basics of real, reactive and complex powers in singlephase and threephase systems.
 Analyse threephase balanced systems.
 Use the basics of inductance and capacitance and apply them in singlephase and threephase transmission lines.
 Perform power flow calculations for short, medium and long transmission lines.
 Derive bus admittance and bus impedance matrices for a given power system network and perform power flow analysis using GaussSeidal method.
 Calculate symmetrical fault currents in a simple power system.
 Appreciate the basics of power system protection, grounding practice in power systems and the operating principles of overcurrent relays.
 Do simple calculations based on the basics of electrical installation in buildings and the operating principles of various substation components.

Programme Outcomes: 
 Ability to acquire and apply fundamental principles of science and engineering(40%)
 Capability to communicate effectively(5%)
 Acquisition of technical competence in specialised areas of engineering discipline(5%)
 Ability to identify, formulate and model problems and find engineering solutions based on a systems approach(10%)
 Ability to conduct research in chosen fields of engineering(5%)
 Understanding of the importance of sustainability and costeffectiveness in design and development of engineering solutions(5%)
 Understanding and commitment to professional and ethical responsibilities(5%)
 Ability to work independently as well as with others in a team(10%)
 Ability to be a multiskilled engineer with good technical knowledge, management, leadership and entrepreneurship skills(5%)
 Awareness of the social, cultural, global and environmental responsibilities as an engineer(5%)
 Capability and enthusiasm for selfimprovement through continuous professional development and lifelong learning(5%)

Assessment Scheme: 
 Lab Experiments  work in group of 2, lab report writing, oral assessment at the end of lab(10%)
 Tutorial / Assignment  group assignment, focus group discussion at tutorial, to enhance understanding of basic concepts in lecture(15%)
 Test Quiz  written exam(15%)
 Final Exam  written exam(60%)

Teaching and Learning Activities: 
53 hours (lectures, tutorials and laboratory experiments) 
Credit Hours: 
3 
PreRequisite: 
ECT1016: Circuit Theory 
References: 

Hadi Saadat, "Power System Analysis", WCB/McGrawHill, 1999. (Textbook)

T. Wildi, "Electrical Machines, drives and power systems", PrenticeHall,
1997.

J.J. Grainger and W. D. Stevenson, Jr. "Power System Analysis", McGrawHill,
1994.

Subject Contents

Introduction to Power System
Generation of electrical power: Various types of conventional and nonconventional
generation plants. Power, reactive power and complex power. Singlephase
and threephase power calculations. Analysis of threephase balanced circuits.
Perunit quantities, Singleline diagram and impedance diagram of power
systems. Simple models of generators and transformers.

Transmission Lines
Calculation of inductances of singlephase and threephase lines. GMR
and GMD. Bundled conductors. Calculation of capacitance of singlephase
and threephase lines. Current and voltage relations: Short, medium and
long lines. Powerflow through short and medium lines.

Network Equations and Calculations
Representation of power system components. Derivations of bus admittance
and bus impedance matrices.

Introduction to Powerflow Analysis
Powerflow equations. Powerflow solution using Guessseidel method.

Symmetrical Fault Calculations
Types of faults, fault calculations, fault levels. Circuit breaker
ratings. Means of reducing fault currents.

Basic Protection
Objective and approach 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.

Distribution System
Substations: Substation components, circuit breakers, airbreak switches,
disconnect switches, Mediumvoltage and lowvoltage distribution, Grounding
electrical installation, electric shock, electrical installation in buildings.
Laboratory
1. PowerFlow Through Transmission Lines
2. PowerFlow analysis
