Date Code 20020501 SEL-421/SEL-421-1 Relay
Manual Change Information
The date code at the bottom of each page of this manual reflects the creation or revision date.
Changes in this manual are summarized below (most recent revisions listed at top).
Release Date Summary of Changes in this Release (Sheet 1 of 2)
This Manual Change Information section is provided as a record of all changes made to this manual since the initial release.
20020501 Reference Manual Section 6: DNP 3.0 Communications
Updated Table 6.17 on page R6.29.
Reference Manual Appendix C: GOMSFE Tables
All UCA2 control points were made readable. Default data was set for the UCA2 FAULT model.
20020417 User’s Guide Appendix A: Firmware Versions
Firmware updated. Spurious Quart interrupts caused by varying character spacing will cause the relay to dis-
able. This condition occurs when a communications processor is automatically retrieving data from the relay
simultaneously with a serial port terminal session.
20020403 Initial Release with Synchrophasor Measurement capability to SEL-421.
Added VAZ, VBZ, VCZ settings options to SYNCP.
Added VAY, VBY, VCY settings options to SYNCS1, SYNCS2 and ASYNCS2.
Added ACOS, ASIN, CEIL, FLOOR and LOG math functions to SEL
OGIC control equations.
Added new analog quantities for use in SEL
OGIC control equations:
Terminal W and X current magnitudes
Terminal Y and Z voltage magnitudes
Instantaneous sequence quantities
Contact inputs
Modified CHI output for SEL-2030 compatibility.
20020108 SEL-421-1 Relay introduction.
Configurable front-panel labels.
I and V Source Selection settings clarifications.
Preface
Added Notes explanation.
User’s Guide Section 1: Introduction and Specifications
Added description of SEL-421-1 Relay.
Added Notes to flag the differences in the SEL-421-1 Relay.
Added Humidity to Specifications.
Added SEL-421-1 Relay Maximum Operating Time to Specifications.
Revised Power and Energy in Specifications.
User’s Guide Section 2: Installation
Added subsection Front-Panel Labels on page U2.26 to describe configurable front-panel labels.
User’s Guide Section 3: PC Software
Added description of SEL-5030
ACSELERATOR
®
Software Analysis function keys F2, F3, and F4.
Revised Relay Editor settings tree view operation.
User's Guide Section 4: Basic Relay Operations
Included front-panel label kit in shipped items list.
Added Notes to flag the differences in the SEL-421-1 Relay.
Fixed Figure 4.45 on page U4.50 and setting SER example procedure.
Fixed Figure 4.55 on page U4.61 and setting control input/52A example procedure.
User’s Guide Section 5: Front-Panel Operations
Added descriptions of configurable front-panel labels.
User’s Guide Section 6: Testing and Troubleshooting
Updated
ACSELERATOR software screen captures.
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