Documentation

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Instruction Manual

SEL-321-5 Phase and Ground Distance Relay

Literature

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Literature

Flyers

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

Instruction Manuals

SEL-321-5 Phase and Ground Distance Relay

Settings Sheets

SEL-321-5 1A Nominal Relay Settings Sheet

SEL-321-5 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

SEL-321-5 Relay Out-of-Step Logic

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

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

Applying the SEL-321 Relay on Series-Compensated Systems

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

Unit Protection Scheme for the SEL-321-5 Relay

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

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

Drawings