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

PROT 300: Symmetrical Components Theory and Application


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

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.


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
Course Information
Course Base Fees: $USD1,800*

CEUs: 2.1
Available Courses
Pullman, Washington, USA
April 28–30, 2020

SEL Event Center
1825 Schweitzer Dr
Pullman, Washington 99163

Additional Information:

8:00 a.m. - 5:00 p.m. each day

Recommended Accommodations:

Residence Inn by Marriott Pullman
1255 NE North Fairway Rd
Pullman, WA 99163 

Holiday Inn Express & Suites Pullman
1190 SE Bishop Blvd 
Pullman, WA 99163 

Best Western Plus University Inn 
1516 W Pullman Rd 
Moscow, ID 83843 

Charlotte, North Carolina, USA
October 20–22, 2020

Schweitzer Engineering Laboratories
901 Center Park Dr
Charlotte, North Carolina 28217

Additional Information:

8:00 a.m. - 5:00 p.m. each day

Recommended Accommodations:

Homewood Suites by Hilton Charlotte/Ayrsley
1921 Ayrsley Town Blvd 
Charlotte, NC 28273 

Hampton Inn & Suites Charlotte-Arrowood Rd
9110 Southern Pine Blvd 
Charlotte, NC 28273 

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Course Requirements


Students should have basic knowledge of power systems. This course also requires working knowledge of the following:

  • Phasor math and trigonometry
  • Per-unit calculations
  • synchroWAVe Event Software

Course Preparation

Please check the General Course Information page for course preparation details. In addition, please make sure that the laptop you bring to class has the following software/features:

    synchroWAVe Event Software

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