html{display:none} APP 311L: SEL-311L Line Current Differential Relay | Schweitzer Engineering Laboratories

APP 311L: SEL-311L Line Current Differential Relay


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

APP 311L provides comprehensive application training for the SEL-311L Line Current Differential Relay, which offers complete line current differential protection with full scheme distance backup. In groups of two, students gain hands-on experience in communicating, metering, monitoring, commissioning, analyzing event reports, and performing control functions by working directly with the SEL-311L Relay.


Day 1
  • Applying Line Current Differential Protection With the SEL-311L
  • SEL-311L Line Current Differential Settings
  • SEL-311L Current Differential Channel Monitoring and Settings
  • Differential Protection Relay Word Elements
  • SELogic Control Equations: Ways to Implement and Document Relay Control Schemes
  • SEL-311L Relay Communications
  • Using acSELerator QuickSet SEL-5030 Software With the SEL-311L Relay
  • SEL-311L Trip Logic and Communications-Assisted Tripping Schemes
  • SEL-311L Relay Setting Example: Two-Terminal Line
Day 2
  • Metering and Monitoring Functions
  • SEL-311L Line Current Differential Relay Simplifies Commissioning Tests
  • SEL-311L Hands-On Training
  • Event Reporting
  • Frequently Asked Questions
  • SEL-311L Relay Backup Protection
  • SEL Mirrored Bits Communications

Course Objectives

At the conclusion of this course, students can:

  • Calculate and apply settings for line current differential protection
  • Set the SEL-311L Relay using HyperTerminal and acSELerator QuickSet
  • Use SELogic control equations to customize the relay logic
  • Apply backup protection, reclosing, and synchronism-check features of the SEL-311L Relay
  • Analyze Sequential Events Recorder (SER) reports
  • Implement relay-to-relay logic communications via the Mirrored Bits communications protocol
Course Information
Course Base Fees: $USD950*

CEUs: 1.4
Available Courses

There are currently no courses available. Request to be notified when this course is added to the schedule.


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Course Requirements


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

  • Basic familiarity with protective relaying, SELogic control equations, acSELerator QuickSet Software, front-panel controls, and SEL-4000 Relay Test System
  • Ability to operate a personal computer and set up a communication session using HyperTerminal
  • Completion of CBT 101: Introduction to SEL Relays (highly recommended)

Course Preparation

Please check the General Course Information page for what you should bring to class. In addition, please make sure that the laptop you bring to class has the following software/features:

  • acSELerator QuickSet SEL-5030 Software with the SEL-311L driver and instruction manual, installed and updated through SEL Compass
  • SEL-5401 Software
  • SEL-C662 USB Driver