html{display:none} TST 107: SEL Transmission Substation Relay Testing | Schweitzer Engineering Laboratories

TST 107: SEL Transmission Substation Relay Testing


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

TST 107 covers skills required to enter settings, test, commission, and troubleshoot this class of SEL relays. Students will:

  • Review skills required to work with SEL relays
  • Learn about specific transmission relay testing considerations
  • Practice skills through 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

SEL equipment will be used during the training, including transformer protection (SEL-487E), distance and directional (SEL-421), and advanced line current differential (SEL-411L) relays.


Day 1

  • Introduction to Relay Testing
  • SELogic Control Equations
  • Using acSELerator QuickSet SEL-5030 Software
  • Introduction to the SEL-411L
  • Using the SEL-5401 Test System Software
  • SEL-411L: 500 kV Example Transmission Line (includes a class exercise)
  • SEL-411L Overcurrent, Time-Overcurrent, and Directional Element Testing: Overcurrent and Directional (includes class exercises)
  • SEL-411L Distance Element Testing (includes a class exercise)
  • Data Capture and Event Reports
  • Enhanced Mirrored Bits Communications 

Day 2

  • 87L Functions in the SEL-411L Relay: Introduction
  • SEL-411L Channel Requirements: Logic, Master, Slave, and Loss of Protection
  • SEL-411L: Communications Channel Verification Hands-On Exercise
  • SEL-411L 87L Element Logic
  • Testing the SEL-411L: 87L Test Modes
  • SEL-411L: Hands-On Testing Exercise
  • SEL-411L: Commissioning an 87L Relay System
  • SEL-411L Internal Faults Hands-On Exercise (optional)
  • SEL-411L External Fault Hands-On Exercise (optional)

Day 3

  • SEL-487E Relay Introduction
  • SEL-487E Metering Exercise
  • Introduction to Differential Testing
  • Single-Phase Testing of the SEL-487E Differential Element Without State Simulation (includes a class exercise)
  • Single-Phase Testing of the SEL-487E Restricted Earth Fault (REF) Element (includes a class exercise)
  • Commissioning Assistant (includes a class exercise)


Course Objectives

At the conclusion of this course, students can:

  • Establish a serial communications link with an SEL relay using HyperTerminal and SEL 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
  • Analyze information recorded by the relay using SEL software
  • Calculate relay test points to verify response
  • Find information in the SEL relay instruction manuals
  • Understand differential relay concepts and determine appropriate test values
Course Information
Course Base Fees: $USD1,425*

CEUs: 2.1
Available Courses

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


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Course Requirements


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

  • Completion of TST 101: SEL Relay Testing Basics
  • Experience testing protective relays
  • Completion of CBT 101: Introduction to SEL Relays
  • Familiarity with protective relaying, SELogic control equations, front-panel controls, and the SEL-4000 Relay Test System 
  • Ability to operate a personal computer and set up a communications session using HyperTerminal 

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, including the SEL-487E, SEL-421, and SEL-411L drivers and instruction manuals, installed and updated through SEL Compass
  • SEL-5401 Software
  • SEL-C662 USB Driver
  • A calculator that is capable of performing computations involving rectangular and polar coordinates (i.e., TI-30Xa or similar)