APP 351: SEL-351 Protection System

Course Length: 2 Days (PDHs: 15)
Course Based Fees: $1,000*
* Plus Applicable Tax


APP 351 provides comprehensive application training for the SEL-351 Protection System, an extremely flexible protective relay used by utilities worldwide, in multiple applications. Working in groups of two, students gain hands-on experience in communicating, setting, metering, monitoring, retrieving event reports, and performing control functions by working directly with the SEL-351S Relay.


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


Day 1

  • SEL-351 Relay Family Overview
  • SEL-4000 Relay Test System: SEL-AMS and SEL-5401 Software
  • Using acSELerator QuickSet SEL-5030 Software With the SEL-351S
  • Front-Panel Targets and Display
  • SELogic Control Equations (includes a hands-on exercise)
  • Relay Settings Overview
  • Overcurrent Elements
  • Best Choice Ground Directional Element
  • Voltage and Frequency Elements
  • Relay Logic and Settings

Day 2

  • SEL-351S Front-Panel Large Operator Controls (includes a hands-on exercise)
  • Hands-On Exercise: Part 1
  • Breaker Monitor
  • Retrieving, Understanding, and Analyzing Event Report Information
  • Optional:
    • Mirrored Bits Communications (includes a hands-on exercise)
    • Data Acquisition and Control Via Distributed Network Protocol (DNP)
    • SEL-351R Recloser Control
    • Hands-On Exercise: Part 2

Learning Outcomes

At the conclusion of this course, students can:

  • Apply the SEL-351S Relay protection, monitoring, and control features.
  • Communicate with the relay through the front panel and serial port.
  • Use QuickSet to apply relay settings, program SELogic control equations, and analyze fault records and the relay element response.
  • Analyze Sequential Events Recorder (SER) reports.
  • Implement relay-to-relay logic communications via the Mirrored Bits communications protocol.
  • Identify multiple applications for the SEL-351 Relay family.
  • Differentiate between SEL-351, SEL-351A, and SEL-351S Relay features.

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.
  • Have the ability to set up relay communications using acSELerator QuickSet SEL-5030 Software.
  • Complete CBT 101: Introduction to SEL Relays (highly recommended).

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.

Available Courses

Request onsite training for your company.