U.1.4
SEL-421/SEL-421-1 Relay User’s Guide Date Code 20020501
Introduction and Specifications
Features
Digital Relay-to-Relay Communication. Use MIRRORED BITS
communications to monitor internal element conditions between
relays within a substation and between substations using
communication channels (SEL fiber-optic transceivers, for example).
Ethernet Communications Capability. Add the optional plug-in SEL-2701
Ethernet Processor to implement control and data gathering
capabilities via substation local-area-networks (LANs) and company
wide-area-networks (WANs). Employ UCA and FTP protocols for
system data acquisition and control.
Increased Security. The SEL-421 Relay divides control and settings into
seven relay access levels; the relay has separate breaker, protection,
automation, and output access levels, among others. Set unique
passwords for each access level.
Computer Software. Use the rules-based settings editor, the
ACSELERATOR software, to develop settings off-line. View a graphical
human machine interface (HMI) for metering and control.
Settings Reduction. Internal relay programming shows only the settings
for the functions and elements you have enabled.
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