html{display:none} APP 87: SEL-387 and SEL-587 Percentage-Restrained Differential Relays | Schweitzer Engineering Laboratories

APP 87: SEL-387 and SEL-587 Percentage-Restrained Differential Relays

PDHs: 15

Course Base Fees: $1,000*
* Plus Applicable Tax


Course Information

This is a two-day course.

Course Base Fees: $1,000 USD

APP 87 provides comprehensive application training for the SEL-387 and the SEL‑587 percentage-restrained differential relays, which offer sensitive, high-speed protection for transformer, machine, and bus differential applications. Students (in groups of two) gain hands-on experience in communicating, setting, metering, monitoring, retrieving and analyzing event reports, and performing control functions by working directly with SEL-387 and SEL-587 Relays. Course topics include:

  • Three-phase, dual-slope percentage-restrained differential elements.
  • Tap, phase, and zero-sequence compensation for transformer differential applications.
  • Harmonic restraint or blocking for transformer inrush and overexcitation.
  • Unrestrained differential element.
  • Multiple phase, negative-sequence, and zero-sequence overcurrent elements.
  • Restricted earth fault ground differential.
  • SELogic control equations.


This course is intended for utility and industrial protection engineers and power system consultants.


Day 1

  • Introduction to Transformer Differential Protection
  • SEL-587 Relay Overview
  • Introduction to SELogic Control Equations
  • Introduction to acSELerator QuickSet SEL-5030 Software and SEL-AMS
  • SEL-587 Differential Settings (includes a class exercise)
  • SEL-587 Differential Element Testing Introduction
  • Hands-On Differential Element Testing
  • SEL-587 Hands-On Analysis

Day 2

  • SEL-387 Relay Overview
  • SEL-387 Front-Panel Targets and Display
  • SEL-387 Hands-On Meter Checks
  • SEL-387 Differential Element Settings (includes a class exercise)
  • SEL-387E Hands-On Differential Elements
  • SEL-387 Hands-On Analysis
  • Introduction to Volts/Hertz Element (includes class exercises)
  • Additional SEL-387E Hands-On Testing

Course Objectives

At the conclusion of this course, students can:

  • Explain the application considerations of differential protection.
  • Apply internal or external phase shift and zero-sequence compensation using two different setting methods in both relays.
  • Use SELogic control equations to customize the relay logic to meet your application requirements.
  • Analyze Sequential Events Recorder (SER) reports and generate COMTRADE files from event reports.
  • Explain testing considerations.

Student Background and Knowledge

Before you attend this class, we recommend that you:

  • Complete 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 set up a communications session.

Available Courses

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Course Preparation

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

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.