html{display:none} WBT 421: Applying Dual-Breaker Reclosing With the SEL-421 Relay | Schweitzer Engineering Laboratories

WBT 421: Applying Dual-Breaker Reclosing With the SEL-421 Relay


Course Information

This is a two-day course.

Course Base Fees: $470 USD

In WBT 421, receive live instruction from an industry expert and practical, step-by-step tutorials without leaving your office. WBT 421 is a web-delivered workshop designed to teach you how to apply dual-breaker reclosing protection with the SEL‑421 Relay for ring-bus and breaker-and-a-half transmission line configurations.


This course is for transmission protection engineers who have a basic understanding of power systems and/or experience with SEL-421 Relays.


Day 1

  • Introduction to WBT 421 Workshop
  • Multi-Breaker Reclosing Practices
  • Dual-Breaker Reclosing Application

Day 2

  • SEL-421 Recloser Scenarios (homework review)
  • SEL-421 Recloser Settings

Course Objectives

At the conclusion of this course, students can:

  • Integrate complete breaker protection and control for two breakers for ring-bus and breaker-and-a-half line configurations.
  • Evaluate fault scenarios to determine how the relay will respond based on the applied dual-breaker protection design.
  • Apply dynamic leader/follower breaker logic.
  • Define and implement reclosing timing based on the requirements of your protection scheme.
  • Evaluate line reclosing and independent reclosing practices.

Student Background and Knowledge

Before you attend this class, we recommend that you:

  • Understand power system protection theory and application.
  • Have experience with SEL relays.

Course Information
Course Base Fees: $USD470*

CEUs: 0.5
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Course Preparation

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.

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

Additional information is on the Course Policies page.