This is the server.
If you mean to be using the Production ("Live") site, please go to
This server is used for reviewing content or features before they go live. The content, data, and functionality on this site may not match the live production website.

TST 103: SEL Feeder Relay Testing


This course is intended for relay technicians or protection engineers and system consultants with an interest in relay testing.

In TST 103, students will learn the skills required to enter settings, test, commission, and troubleshoot SEL relays.

Students will:

  • Review skills required to work with SEL relays
  • Learn about specific distribution relay testing considerations
  • Practice the acquired skills by working with different relays throughout the course
  • Gain familiarity with the operating principles of each type of relay
  • Explore the features of SEL relay technology to make appropriate choices when designing test routines

A variety of SEL relays are used during TST 103, including feeder protection (SEL-751A), transformer protection (SEL-787), and directional overcurrent (SEL-351S) relays.


Day 1
  • Introduction to Relay Testing
  • Overview of acSELerator QuickSet SEL-5030 Software
  • SEL-751A Relay Overview
  • Introduction to SELogic Control Equations
  • SEL-751A Hands-On Testing
  • Event Report Analysis
Day 2
  • SEL-787 Relay Overview
  • Introduction to Differential Testing
  • SEL-787 Hands-On Testing
  • SEL-787 Hands-On Analysis
Day 3
  • SEL-351S Relay Overview (includes a hands-on exercise)
  • SEL-351S Hands-On Testing: Part 2
  • Negative-Sequence Impedance Directional Element (includes a hands-on exercise)
  • SEL-351S Hands-On Analysis

Course Objectives

At the conclusion of this course, students can:

  • Establish communications with an SEL relay using acSELerator QuickSet SEL-5030 Software
  • Enter settings into an SEL relay
  • Equate Relay Word bits and SELogic control equations to traditional relay element outputs and discrete contact logic
  • Test, commission, and troubleshoot using metering, sequential events recording, and event reporting features of SEL relays
  • Calculate relay test points based on relay settings
  • Analyze relay response with information recorded by the relay using SEL software
  • Find information in the SEL relay instruction manuals
  • Understand differential relay concepts and determine appropriate test values

Course Requirements


Before you attend this class, you must meet the following requirements:

  • Completed TST 101: SEL Relay Testing Basics or have prior experience testing protective relays
  • Completed CBT 101: Introduction to SEL Relays
  • OR
  • Have basic familiarity with protective relaying, SELogic control equations, front-panel controls, and the SEL-4000 Relay Test System
  • Have the ability to operate a personal computer and set up a communications session

Course Preparation

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

  • acSELerator QuickSet SEL-5030 Software with the SEL-787, SEL-751A, and SEL-351S drivers and instruction manuals, installed and updated through SEL Compass
  • SEL-5601-2 synchroWAVe Event Software 
  • SEL-5401 Test Software
  • SEL USB Driver
  • A calculator capable of performing computations involving complex numbers (i.e., TI 30xa or similar)

Course Information
Course Base Fees: 1,275 USD*
CEUs: 2.1
  • Power System Protection for Technicians Track - Required
Available Courses

There are currently no courses available. Request to be notified when this course is added to the schedule.



Request a quote for on-demand training for your company.

Get Quote

SELU Training Question