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

APP 311L: SEL-311L Line Current Differential 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

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.


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


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 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.

Student Background and Knowledge

Before you attend this class, we recommend that you:

  • Have basic familiarity with protective relaying, SELogic control equations, QuickSet, front-panel controls, and the SEL-4000 Relay Test System.
  • Complete CBT 101: Introduction to SEL Relays.

Available Courses

Request onsite training for your company.

Get Quote

SEL University Training Question



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.