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Literature

Flyers

Featured SEL-421 Protection, Automation, and Control System

SEL Digital Secondary System Solutions

SEL Time-Domain Link (TiDL) Technology

Data Sheets

SEL-421-4, -5 Protection and Automation System

SEL-421-7 Protection, Automation, and Control System With Sampled Values or TiDL Technology

Guideform Specifications

SEL-421-7 Relay with Sampled Values or TiDL Technology

SEL-421-4, -5 Protection, Automation, and Control System

Installation Guides

SEL-400 Series TiDL Quick-Start Guide

Installing IP52 Dust Protection for SEL-400 Series Panel-Mount Relays

Instruction Manuals

SEL-421-4, -5 Protection, Automation, and Control System

SEL-421-4, -5 Protection, Automation, and Control System and SEL-400 Series Relays

SEL-421-7 Protection, Automation, and Control System With Sampled Values or TiDL Technology

SEL-421-7 Protection, Automation, and Control System With Sampled Values or TiDL Technology and SEL-400 Series Relays

Configurable Labels

SEL-400 Series Configurable Label Template (Vertical)

SEL-400 Series Configurable Label Template (Vertical; A4)

SEL-400 Series Enhanced HMI Configurable Label Template (Horizontal)

SEL-400 Series Enhanced HMI Configurable Label Template (Horizontal; A4)

SEL-400 Series Configurable Label Template (Horizontal)

SEL-400 Series Configurable Label Template (Horizontal; A4)

SEL-400 Series Enhanced HMI Configurable Label Template (Vertical)

SEL-400 Series Enhanced HMI Configurable Label Template (Vertical; A4)

SEL 400 Series Configurable Label Instructions

Ordering Information

SEL-421-7 With Sampled Values or TiDL Technology

SEL-421-4, -5 Protection, Automation, and Control System

Wiring Harness for Connectorized SEL-421

Related Downloads

SEL-421-4, -5 DNP3 Device Profile Information

SEL-421-7 DNP3 Device Profile Information

Certificates

SEL-421-4,5 IEC 61850 Edition 2 Conformance Certificate

SEL-421-7 IEC 61850 Edition 2 Conformance Certificate

SEL-421-4,5 IEC 61850 Edition 2 MICS

SEL-421-4,5 IEC 61850 Edition 2 PICS

SEL-421-4,5 IEC 61850 Edition 2 PIXIT

SEL-421-4,5 IEC 61850 Edition 2 TICS

SEL-421-7 IEC 61850 Edition 2 MICS

SEL-421-7 IEC 61850 Edition 2 PICS

SEL-421-7 IEC 61850 Edition 2 PIXIT

SEL-421-7 IEC 61850 Edition 2 TICS

Publications

Application Guides

Programming Non-Directional Distance Elements in the SEL-411L and SEL-421

Related Material

AG2023-10

Applying SEL Relays in Systems With Inverter-Based Resources

Healthy Voltage Supervision for Manual Alternate Voltage (ALTV) Activation in SEL-400 Line Relays

Maintaining Switched-Mode Relay Responsiveness in an RSTP Network

Implementation of the SEL-49 Relay Line Thermal Protection in the SEL-421 Relays Using SELogic Equations

Basic Configuration of Sampled Values Using SEL-401 Merging Unit and SEL-421-7 SV Subscriber Relay

Testing Power Elements in the SEL-351S, SEL-421, and SEL-700G

Related Material

Testing Power Elements

Testing the Conventional Out-of-Step Element Using Multistate Tests for Line Protection Relays

Related Material

OOS Testing

Applying SEL-411L and SEL-421 Relays to Permissive Underreaching Transfer Trip (PUTT) Schemes

Defining DCE and DTE: Null Modem Cable and Straight-Through Cable Applications

Implementing Inverse-Time Frequency Elements Using SEL-400 Series Relays to Comply With NERC Standard PRC-024-3

Use SEL-300 and SEL-400 Series Relays to Set Up POTT and DCB Schemes

Understanding and Effectively Using the SEL Mirrored Bits Protocol

Testing the High-Speed Mho Elements in the SEL-411L and SEL-421

Related Material

High-Speed Mho Distance Testing

Maintaining IEC 61850 Configuration While Upgrading Firmware in SEL-400 Series Relays

Mapping Analog Inputs to a SCADA Protocol for Remote Indication of Fault Location in SEL-311, SEL-321, SEL-421, and SEL-411L Relays

Revised Setting Guidelines for E32 in SEL Relays

Circuit Breaker Monitoring Using the SEL-421 Relay

Testing the SEL-421-4-5 Quadrilateral Phase Element for a Balanced Three-Phase Fault

Related Material

Quadrilateral Phase Testing Calculator Spreadsheet

Using the SEL-421 to Functionally Replace the SEL-68

Related Material

acSELerator QuickSet SEL-5030 Software example file(1)

Implementing Memory Register Functions Using Advanced SELogic Control Equation Math Functions in SEL-400 Series Relays

Applying the SEL-421 Relay to Permissive Overreaching Transfer Trip Schemes

Setting the SEL-421 Relay With Sub-Cycle Elements in a Directional Comparison Blocking Scheme

Reclosing in the SEL-421 for Different Reclose Supervision Conditions

Implementation of Inverse-Time Over- and Undervoltage Elements in SEL-451 and SEL-421 Relays

Applying the SEL-421 Protection, Automation, and Control System Recloser on Adjacent Lines With Breaker-and-a-Half Bus Arrangement

Setting an SEL-421-1 Relay to Obtain SEL-287V-0 Relay Functions

Related Material

Setting Mask Conversion 287V0 to 421-1 (.xls)

SEL-287V0 to SEL-421-1 Application Example (.rdb)

Using SEL-421 Relay Synchrophasors in Basic Applications

LOG Input Considerations When Implementing a DCUB Scheme Using Mirrored Bits Communications in the SEL-321, SEL-311C, SEL-311L, and SEL-421 Relays

SEL-421 Relay Fast Messages

Programming a LOCK Pushbutton in the SEL-421 Relay

Use SEL-421, SEL-321, and SEL-311 Relays Where Different Systems Are Required for Primary and Backup Line Protection

Application Notes

Changing Metering Direction in SEL-400 Series Relays for SCADA Applications

Archive Wide-Area Information With Synchrophasors

Detecting Power System Islanding With Time Error Measurement

Estimating Power System Frequency With Synchronized Measurement

Generator Black-Start Restoration Using Synchronized Measurement

Technical Papers

Challenges and Solutions for Distance Elements Protecting Transmission Lines With Tapped Loads

Complete Monitoring Solution to Improve Reliability and Performance of Digital Secondary Systems

Catastrophic Breaker Failures Due to Missing Current Zero-Crossings in Highly Shunt-Compensated 500 kV Lines—Point-on-Wave, Reclosing, and Protection Considerations

Improving Ground Fault Sensitivity for Transmission Lines Near Inverter-Based Resources

Getting the Lines Crossed—How a Three-Phase Series Fault Caused a Sequence of Relay Operations

Security Criterion for Distance Zone 1 Applications in High SIR Systems With CCVTs

Evaluating Phasor-Based and Time-Domain Elements for Short Line Applications

Applying Dependable and Secure Protection With Quadrilateral Distance Elements

Ground Fault Protection for Resistance-Grounded Collector Feeders With Inverter-Based Resources

Performance of IEC 61850 Sampled Values Relays for a Real-World Fault

Attack Tree Analysis of a Digital Secondary System in an Electrical Substation

Improve Protection Communications Network Reliability Through Software-Defined Process Bus

Voltage and Current Inversion Challenges When Protecting Series-Compensated Lines – A Case Study

Zero-Setting Power-Swing Blocking Protection

Line Protection: Redundancy, Reliability, and Affordability

Experience With Subcycle Operating Time Distance Elements in Transmission Line Digital Relays

Transmission Line Protection System for Increasing Power System Requirements

Application Guidelines for Power Swing Detection on Transmission Systems

Relay-to-Relay Digital Logic Communication for Line Protection, Monitoring, and Control

White Papers

Best Practices for Implementing PTP in the Power Industry

Fly Safe and Level: Customer Examples in Implementing Dual Primary Protection Systems

SEL-421 Performance As Both a Protective Relay and a Phasor Measurement Unit

Drawings

PDF

SEL-421 Front- and Rear-Panel Diagrams