Documentation

Featured

Instruction Manual

SEL-321-0, -1 Phase and Ground Distance Relay

Literature

Documents sorted by newest first.

Literature

Flyers

SEL-9220 Fiber-Optic Adapter for SEL-300 Series Relays

Instruction Manuals

SEL-321-0, -1 Phase and Ground Distance Relay

SEL-321-2 Phase and Ground Distance Relay

SEL-321-3, -4 Phase and Ground Distance Relay

Settings Sheets

SEL-321-0,-1 1A Nominal Relay Settings Sheet

SEL-321-0,-1 5A Nominal Relay Settings Sheet

SEL-321-2 1A Nominal Relay Settings Sheet

SEL-321-2 5A Nominal Relay Settings Sheet

SEL-321-3, -4 1A Nominal Relay Settings Sheet

SEL-321-3, -4 5A Nominal Relay Settings Sheet

Publications

Application Guides

Applying SEL Relays in Systems With Inverter-Based Resources

Maintaining Switched-Mode Relay Responsiveness in an RSTP Network

Introduction to SEL Relays for New Users

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

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

Using an SEL-321 and an SEL-311 Series Relay to Set Up POTT and DCB Schemes

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

Applying the SEL-321 Relay to Permissive Overreaching Transfer Trip (POTT) Schemes

The SEL-321 Relay Load-Encroachment Function Setting Guidelines

Using the SEL-2126 Fiber-Optic Transfer Switch and the SEL-321-1 in Bypass-Breaker Mirrored Bits Communications-Assisted Tripping Schemes

Recommended Ways to Detect Loss-of-Potential (LOP) Conditions in the SEL-321, SEL-421, and SEL-311 Series Relays

SEL-321-1/SEL-321-2 Configuration and Fast Meter Messages

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

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

Three-Terminal Line Protection Using SEL-321-1 Relays With Mirrored Bits Communications

Using SEL Relays to Provide Primary or Backup Bus Protection

Applying the SEL-321 Relay on Series-Compensated Systems

Improvements to the Loss-of-Potential (LOP) Function in the SEL-321

SEL-221F/SEL-321 Relay Setting Equivalency Sheet

SEL-221G-5/SEL-321 Relay Setting Equivalency Sheet

Multiple Reclosing Functions in the SEL-321 Relay Using SELogic Control Equations

Testing the SEL-321-1 Relay-to-Relay Digital Logic Communication Time Delay

Single-Pole/Three-Pole Autoreclose Function for Single Breaker Applications in the SEL-321 Relay Using SELogic Control Equations

Setting the Zero-Sequence Compensation Factors in SEL-321 Relays to Avoid Overreach in Mutual Coupled Lines

Using SELogic Control Equations to Provide Separate Trip Coil Monitor (TCM) Alarm Outputs in the SEL-321 Relay When Applied to Two-Breaker Line Terminals

Using the SEL-321 Relay and SEL-221F Relay for Primary and Backup Transmission Protection

Three Terminal POTT Protection Using the SEL-321 Relay

SEL-321-1 Compressed ASCII Commands

Using the SEL-321 Relay and SEL-221G Relay as Primary and Backup Transmission Protection

REJO Application Guidelines

SEL-321-2 Relay Compressed ASCII Commands

Applying SEL Distance Relays on Lines with Power Transformers or Open Delta VTs

Implementation of a New Communication-Aided Tripping Scheme Using the SEL-321 Relay Mirrored Bit Function

Applying the SEL-321 Relay to Directional Comparison Unblocking (DCUB)Schemes

A Breaker Simulator in the SEL-321 Relay for Three-Pole Tripping Applications

SEL-321 Zone 1 Extension Logic Description

SEL-221B/121B, SEL-221C/121C, SEL-221G/121G, SEL-221H/121H, SEL-221S/121S, SEL-121-10, SEL-2PG10/PG10, SEL-321-1 Fast Meter Command Processing

Testing Frequency Shift Carrier From a Single End Using the SEL-321 Relay

SEL-321 Relay Breaker Failure Protection

Select the Best Reclosing Method for Your Application

Fast Operate Command Processing

SEL-221G-3/SEL-321 Relay Setting Equivalency Sheet

SEL-221H/SEL-321 Relay Setting Equivalency Sheet

Applying the SEL-321 Relay to Directional Comparison Blocking (DCB) Schemes

Case Studies

Paper Mill Pioneers Power Protection Using Optical Fiber Skywire Supported by Digital Relay Protection

Technical Papers

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

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

Drawings