Per-Unit System Analysis of Electrical Power Systems

Online /
Mar 4, 2019 /
Course Code: 0304-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:

  • Recognize Per Unit Values
  • Understand the Advantages of using Per-Unit Values
  • Derive the Base Quantities of a System
  • Define the Basic Steps to the Per Unit Conversion Process
  • Work Out Practical Single and Three Phase Examples

This course is designed to provide a basic understanding of Per Unit System used in the calculations and analysis of single and three phase power circuits. It will provide the student with the background knowledge on which the modern day computer software programs are based. It will include working examples of practical situations and the way manufacturers use per unit and percent impedances when describing the ratings of their products.

Course Outline:

  • Defining Per Unit Values
  • Defining the Base Quantities
  • Converting to/from Per Unit Values
  • Per Unit Values in a Three Phase System
  • Understanding Transformer Ratios in the Per Unit System
  • Understanding “Y” and “Delta” Loads in the Per Unit System
  • Working Single and Three Phase Examples
  • “Base” Conversion
  • The Per-Unit System Advantages

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
15-25     Defining Per Unit Values & Their Base Quantities
25-40     Converting to/from Per Unit Values Using Examples
40-60     Transformer Ratios in the Per Unit System
60-80     Per Unit Values in a 3 Phase System with “Y” & “Delta” Loads
80-120   Converting Base Values


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)


We always want to improve the quality of our courses. Please select any reasons why you feel this course is inadequate (check all that apply).

Please check this box:
Course Rating

We currently do not have enough attendee responses to generate a rating for this course.

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.
EPIC's email newsletter is a great source of information for:

  • course updates
  • surveys
  • informative articles/papers
  • exclusive discounts