APP 421: SEL-421 Protection, Automation, and Control System

APP 421 provides comprehensive application instruction for the SEL-421 Protection, Automation, and Control System, an extremely flexible, high-speed relay for dual-breaker control applications used in multiple functions. Students (in groups of two) will gain hands-on experience in communicating, setting, metering, monitoring, reading event reports, retrieving event reports, and performing control functions working directly with the SEL-421 Relay.

Audience

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

Agenda

Day 1

• Introduction to the SEL-421
• Introduction to the Example Protection Scheme
• Introduction to SEL-421 Relay Communications and ACSELERATOR QuickSet SEL-5030 Software
• SELOGIC Control Equations
• Global Settings
• Breaker Monitor
• Line Configuration, Relay Configuration, and Distance Element Settings

Day 2

• Switch-Onto-Fault, Out-of-Step, and Load-Encroachment Settings
• Time-Overcurrent Elements
• Directional Elements
• Pole-Open Detection
• Communications-Assisted Tripping Schemes
• Breaker Failure
• Synchronism-Check Element
• Reclosing

Day 3

• Trip Logic
• Output Settings
• Front-Panel Settings
• Data Capture and Event Reports
• Communication Protocols
• Metering
• Time Synchronization and Synchrophasors

Course Objectives

At the conclusion of this course, students can:

• Apply the SEL-421 Relay protection, monitoring, metering, and control features, including current and voltage selection logic.
• Use the SELOGIC control equations with math and comparison variables in the independent protection and automation areas.
• Apply relay settings, program SELogic control equations, and analyze fault records and relay element responses using QuickSet.
• Analyze Sequential Events Recorder (SER) reports and use COMTRADE files.
• Implement relay-to-relay logic via MIRRORED BITS communications.
• Map and retrieve critical analog and digital information in DNP3 Level 2.
• Select the appropriate Enable Source Selection (ESS) setting for required applications.
• Communicate with the relay via the front panel and HMI interface, including pushbuttons and associated LEDs, display points, targeting LEDs, and front-panel metering.

Student Background and Knowledge

Before you attend this class, we recommend that you:

• Complete CBT 101: Introduction to SEL Relays OR have familiarity with protective relaying, SELOGIC control equations, QuickSet, front-panel controls, and the SEL-4000 Relay Test System.
• Have the ability to set up a communications session.