html{display:none} PROT 300: Symmetrical Components Theory and Application | Schweitzer Engineering Laboratories

PROT 300: Symmetrical Components Theory and Application

PDHs: 23

Course Base Fees: $1,800*
* Plus Applicable Tax


Course Information

This is a three-day course.

Course Base Fees: $1,800 USD

PROT 300 is designed to help engineers and technicians analyze faults using symmetrical components. Symmetrical components and the per-unit system are two of the most fundamental and necessary types of mathematics for relay engineers and technicians. PROT 300 provides both theoretical and real-world examples to help the student gain experience calculating and using symmetrical components for various types of faults. Students will gain a fundamental understanding of symmetrical components and hands-on experience comparing calculated values to real-world event reports using SEL-5601-2 synchroWAVe Event Software or the event viewer of their choice.


Utility and industrial protection engineers, consultants, and technicians should attend this course.


Day 1

  • Phasors
  • Per Unit
  • Balanced Faults
  • Introduction to Symmetrical Components
  • Sequence Networks
  • Fault Calculations Using Sequence Networks

Day 2

  • Single-Phase Vs. Three-Phase Fault Current
  • Faults on a Radial System
  • Faults on a Nonradial System
  • Changing Bases
  • Phase Rotation
  • Fault Locator

Day 3

  • Transformer Phase-to-Ground Fault
  • Transformer Phase-to-Phase Fault
  • Fault Identification Selection (FIDS) Logic
  • High-Impedance Fault
  • Open Phase
  • Zero-Sequence Currents in an Autotransformer

Note: This course teaches fundamental knowledge but does not provide hands-on experience with SEL relays.

Course Objectives

At the conclusion of this course, students can:

  • Define phasors and perform phasor operations.
  • Define and identify advantages of the per-unit system.
  • Convert systems into per-unit quantities.
  • Define short-circuit (fault) types.
  • Simplify complex circuits using a Thévenin equivalent circuit.
  • Identify the zero-, positive-, and negative-sequence components.
  • Convert between phase and symmetrical component values.
  • Calculate symmetrical components for nontraditional fault types and phase rotations.
  • Determine sequence impedances for transformers, generators, and transmission lines.
  • Connect sequence networks and calculate fault currents for various shunt and series fault types.
  • Analyze various types of faults using symmetrical components and real event reports.
  • Learn how a delta-wye transformer’s phase shift is represented in the symmetrical component networks.
  • Learn how relays use symmetrical components to determine the fault type and location.

Student Background and Knowledge

Before you attend this class, we recommend that you:

  • Have a basic knowledge of power systems.
  • Have a working knowledge of phasor math and trigonometry, per-unit calculations, and synchroWAVe Event Software.

Click here to view our recommended reading on these topics:

  • Electric circuit analysis
  • Power systems that cover symmetrical components and fault analysis

Available Courses

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Course Preparation

Install or update the following software/files on the laptop you are bringing to class:

  • SEL-5601-2 synchroWAVe Event Software.
  • Digital course materials: A link to download the digital course materials will be sent via email 2 weeks prior to the course, and a workbook will be provided on the first day.

In addition, please bring a scientific calculator that is capable of performing computations involving phasor addition, subtraction, multiplication, and division (Casio FX-115ES or equivalent).

Additional information is on the Course Policies and FAQ pages.