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Symmetrical Components for Three Phase Power Analysis
Rating: 4.6 out of 5(62 ratings)
318 students

Symmetrical Components for Three Phase Power Analysis

A tool for the study of asymmetrical three phase voltages and current analysis
Created byGraham Van Brunt P. Eng., B.Sc.
Last updated 9/2017
English
English [Auto],

What you'll learn

  • In this course, you will learn exactly what symmetrical components are, their main advantages, how manufacturers of equipment use it.
  • You will learn how to use symmetrical components to simplify asymmetrical three phase voltages and current and understand fault analysis.
  • Including Positive, Negative and Zero Sequence Components
  • You can later apply this knowledge to single phase to ground, two phase to ground, phase-to-phase, and three phase fault conditions.
  • This course may be considered a prerequisite to the course "short circuit analysis for high-voltage three-phase systems".

Course content

1 section • 7 lectures • 1h 30m total length

  • Introduction9:14

    Explore the system of symmetrical components, a method that decouples an unbalanced three phase set into balanced sequences for fault analysis and protection in power systems.

  • Ch 01 Symmetrical Components Overview18:06

    Explore symmetrical components, pioneered by Fortescue, to express unbalanced three-phase phasors as a sum of zero, positive, and negative sequence components, enabling simple analysis of faults and balanced systems.

  • Ch 02 The Components3:14

    Explore positive, negative, and zero sequence components in three-phase analysis, where positive sequence phasors share magnitude with 120-degree counter-clockwise shifts, negative sequence rotates clockwise, and zero sequence remains in phase.

  • Ch 03 The "a" Operator6:27

    Learn the A operator for three-phase power analysis, rotating a phasor by 120 degrees, and explore A^2, inverse, and the identity 1+a+a^2=0.

  • Ch 04 Working with the a Operator3:57

    Apply the a operator to express all three-phase phasors from positive, negative, and zero sequence components, replacing B and C phases in terms of a phase and sequence operators.

  • Ch 05 Synthesis Equations18:49

    Describe how asymmetric phasors can be expressed as positive, negative, and zero sequence components using Fortescue's symmetric components, enabling simple analysis and back-translation for unbalanced circuits.

  • Ch 06 Problems & Solutions30:49

    Explore symmetrical components for three-phase power analysis by calculating zero, positive, and negative sequence currents and voltages. Verify results analytically and graphically using ABC rotation and phasor addition.

Requirements

  • The student should have an understanding of the laws and theorems related to three phase electrical power systems.

Description

The method of symmetrical components is used to simplify asymmetrical three phase voltages and current analysis by converting the unbalanced system into two sets of balanced phasors and a set of single-phase phasors, or symmetrical components. These sets of phasors are called the positive, negative, and zero sequence components.

An understanding of this method is essential for the understanding of fault analysis and modern day protection schemes. This course will provide you with the knowledge to comprehend the concept and how it is applied

Who this course is for:

  • The targeted audience is Managers, Engineers, Technologists, Maintenance Personnel working in the electrical power protection industry.

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