Symmetrical Components for Unbalanced 3 Phase Power System Analysis

Online /
Mar 5, 2019 /
Course Code: 0305-WEB19

  • Overview
  • Syllabus
  • Instructor



This course is part of a web series entitled 'Web Series: System Fault Analysis' which includes three webinars:

You save 20% when you enroll for the series.

After Participating in this course, you will be able to:

  • Define Symmetrical Components and their Use
  • Understand the Advantages of using Symmetrical Components
  • Recognise an Unbalanced System and When it Occurs
  • Define the a Operator and its Functionality
  • Convert to and from Symmetrical Components

This course is designed to provide a basic understanding of Symmetrical Components used in the analysis of asymmetrical currents and voltages in a three phase system. It will provide the student with the background knowledge on which to model different faults on a three phase circuit. It will include working examples of practical situations and a quick peek into how models are derived for; phase-to-ground, phase-to-phase, phase-to-phase-to-ground and three phase short circuits are derived.

Course Outline:

  • Charles Fortescue Engineer and Founder of Symmetrical Components
  • Defining Symmetrical Components
  • The Positive, Negative and Zero Sequence Components
  • Unbalanced Currents and Voltage in a Three Phase System
  • Phase-to-Ground Unbalanced Currents
  • Phase-to-Phase Unbalanced Currents
  • A Closer Look at the Positive, Negative and Zero Sequence Components
  • Defining the a Operator and Some of its Properties
  • The Process of Converting to and from Symmetrical Components

Who Should Attend:
Those looking to work in the protection and control area of power systems and wish to have a more comprehensive understanding of the basic workings of this area.

  • Students
  • Managers
  • Engineers
  • Technologists
  • Maintenance Workers

Special Features:
Complete reference material will be available in the form of PDF files and direct reference to internet resources.

More Information

Time: 12:00 PM - 2:00 PM Eastern Time

Please note: You can check other time zones here.

System Requirements PC-based attendees
OS: Windows XP, 2003 Server, Vista, 7, 8, 10
Internet Explorer 7.0 or newer
Mozilla Firefox 4.0 or newer
Google Chrome 5.0 or newer

Macintosh based attendees
OS: Mac OS X 10.6 (Snow Leopard), 10.7 (Lion), 10.8 (Mountain Lion) or newer
Safari 3.0 or newer
Mozilla Firefox 4.0 or newer
Google Chrome 5.0 or newer

iPad 1 or newer, iPhone 3GS or newer, iPod Touch (3rd generation) or newer
OS: iOS 6 or newer

OS: Android 2.2 or higher


Daily Schedule
This course is 1 day - 2 hours in duration


Day 1

0-15 Introduction (Charles Fortescue)
15-25 Defining Symmetrical Components (+’ve; -‘ve & Zero Sequence)
25-40 Unbalanced Currents and Voltage
40-60 A Closer Look at Positive, Negative & Zero Sequence Components
60-80 The “a” Operator and its Properties
80-120 Converting to & from Symmetrical Components


Graham Van Brunt

Graham graduated from Queen's University and has spent his entire career in the power sector of engineering, applying his skills in protection and control internationally.

Professional Experience

  • Siemens
  • AECON - Nuclear
  • Wardrop Engineering
  • Churchill Falls Labrador Corp.
  • DST Consulting Engineers
  • Ontario Hydro
  • Confederation College (Thunder Bay)


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Fee & Credits
  • 0.2 Continuing Education Units (CEUs)
  • 2 Professional Development Hours (PDHs)

$175 + taxes


On-Site Training
This course can be customized and delivered to your group of staff at your facility, saving time and money.
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