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SEL-421 Relay Instruction Manual Date Code 20171021
Preface
Safety Information
Section 19: Remote Data Acquisition
. Describes the basic concepts of remote
data acquisition systems. This includes both the Time-Domain Link
(TiDL) remote data acquisition system, which uses SEL-2440 Axion
modules to provide remote data acquisition and I/O communication, and
UCA 61850-9-2LE Sampled Values.
Appendix A: Manual Versions
. Lists the current manual version and details dif-
ferences between the current and previous versions.
Appendix B: Firmware Upgrade Instructions
. Describes the procedure to update
the firmware stored in Flash memory.
Appendix C: Cybersecurity Features
. Describes the various features of the relay
that impact cybersecurity.
Glossary
. Definitions of various technical terms used in the SEL-400 series
instruction manuals.
Safety Information
Dangers, Warnings, and Cautions
This manual uses three kinds of hazard statements, defined as follows:
Safety Symbols
The following symbols are often marked on SEL products.
Indicates an imminently hazardous situation that, if
not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation that, if
not avoided, could result in death or serious injury.
Indicates a potentially hazardous situation that, if
not avoided, may result in minor or moderate injury
or equipment damage.
Refer to accompanying documents.
Se reporter à la documentation.
Earth (ground) Terre
Protective earth (ground) Terre de protection
Direct current Courant continu
Alternating current Courant alternatif
Both direct and alternating current Courant continu et alternatif
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