html{display:none} APP 487B: SEL-487B Bus Differential and Breaker Failure Relay (United Arab Emirates) | Schweitzer Engineering Laboratories

APP 487B: SEL-487B Bus Differential and Breaker Failure Relay (United Arab Emirates)


APP 487B is designed for utility and industrial protection engineers and power system consultants. This course explores the implementation of station-wide, low-impedance current differential protection and integrated circuit breaker failure detection using the SEL-487B.

You will learn about single- and three-relay applications for basic and complex busbar arrangements. We will discuss backup overcurrent protection, event recording, automation, and time-synchronization capabilities. During the course, you will work directly with the SEL-487B to perform hands-on communications, settings, and testing.

Course topics include:

  • Busbar differential protection.
  • Bus coupler configurations and settings.
    • Coupler security logic.
    • Bus coupler faults and accelerated tripping.
  • Advanced zone selection logic and CT requirements.
  • Open-phase detection and breaker failure protection.
  • Phase, negative-sequence, and zero-sequence voltage supervision.
  • Disconnect and breaker status monitoring.
  • Multiple event report analysis and high-resolution Sequential Events Recorder (SER) reports.
  • Settings management and event analysis using acSELerator QuickSet SEL-5030 Software.
  • Direct transfer trip with Mirrored Bits communications.


  • Relay Overview
  • Front-Panel HMI and Hardware Overview
  • Relay Communications
  • SELogic Control Equations
  • Single-Zone Application Example
  • Alias Settings
  • Global Settings
  • Zone Configuration Settings
  • Protection Settings
  • Output Configuration and Settings
  • Front-Panel Settings
  • Event Report Retrieval and Analysis
  • Dual-Zone Application Example
  • Breaker Failure Protection

Course Objectives

At the conclusion of this course, students can:

  • Determine busbar classifications and interpret station diagrams.
  • Establish a busbar protection philosophy.
  • Describe differential bus protection schemes, principles, and performance standards.
  • Determine input information needed for protection zone selection.
  • Assign relay inputs using SELogic control equations and alias names.
  • Develop settings for different busbar configurations.
  • Program front-panel LEDs to indicate latch bit status.
  • Access relay status and event history for multiple relays.

For additional information and to register, please contact:

Ali Omran
Regional Business Manager
Phone: +973.1752.7700

Course Information
Course Base Fees: $950 USD*

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


Course Requirements


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

  • Completion of CBT 101: Introduction to SEL Relays (highly recommended)
  • OR
  • Basic familiarity with protective relaying, SELogic control equations, acSELerator QuickSet SEL-5030 Software, front-panel controls, and relay testing.
  • Ability to operate a personal computer and set up a communications session using HyperTerminal.

Course Preparation

Please check the General Course Information page for what you should bring to class. In addition, use SEL Compass to download and install the following on the laptop you bring to class:

  • acSELerator QuickSet SEL-5030 Software with the SEL-487B driver and instruction manual