Documentation

Featured

Instruction Manual

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

Literature

Documents sorted by newest first.

Literature

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

Drawings