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

TST 107: SEL Transmission Substation Relay Testing

PDHs: 23

Course Base Fees: $1,500*
* Plus Applicable Tax


TST 107
Course Information

This is a three-day course.

Course Base Fees: $1,500 USD

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.


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


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.

Student Background and Knowledge

Before you attend this class, we recommend that you:

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Course Preparation

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

In addition, you will need a calculator that is capable of performing computations involving rectangular and polar coordinates (i.e., TI-30Xa or similar).

Please ensure that your laptop does not have any installation blocks before you come to class.

Additional information is on the Course Policies and FAQ pages.