html{display:none} APP 787: SEL-787 Transformer Protection Relay | Schweitzer Engineering Laboratories

APP 787: SEL-787 Transformer Protection Relay

PDHs: 15

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


Course Information

This is a two-day course.

Course Base Fees: $1,000 USD

This two-day course provides hands-on application and step-by-step settings guidance for the SEL‑787 Transformer Protection Relay. APP 787 includes applying simplified calculation methods and recommendations and using data from real-world transformers to develop protection settings. Students (in groups of two) will work directly with an SEL-787 Relay to configure system data and determine protection settings.


APP 787 is intended for utility and industrial protection engineers and power system consultants.


Day 1

  • Product Overview
  • Differential (87) Element Settings
  • Commissioning Assistant
  • Relay Logic Settings
  • Through-Fault Event Monitor

Day 2

  • Restricted Earth Fault (REF) Element Settings
  • Overcurrent Elements
  • Overexcitation Volts/Hertz (24C) Element Settings
  • Over- and Undervoltage (59, 27) Protection
  • Frequency (81) Protection Settings
  • Event Report Retrieval and Analysis

Course Objectives

At the conclusion of this course, students can:

  • Use acSELerator QuickSet SEL-5030 Software to read and send settings to the relay.
  • Determine system and transformer winding data and configuration settings.
  • Calculate CT compensation, operate and restraint, and harmonic blocking settings.
  • Test high- and low-voltage CT configuration settings using Commissioning Assistant.
  • Determine settings for through-fault element protection and monitoring.
  • Apply effective protection for REF, overexcitation, undervoltage, and underfrequency.
  • Test settings by observing relay operation after current/voltage is applied.

Student Background and Knowledge

Before you attend this class, we recommend that you:

Available Courses

Charlotte, NC, USA
February 6–7, 2024

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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.