Date Code 20020501 User’s Guide SEL-421/SEL-421-1 Relay
Section 5
UUser’s Guide
Front-Panel Operations
The SEL-421 Relay front panel makes power system data collection and
system control quick and efficient. Using the front panel, you can analyze
power system operating information, view and change relay settings, and
perform relay control functions. The relay features a straightforward menu-
driven control structure presented on the front-panel liquid crystal display
(LCD). Front-panel targets and other LED indicators give a quick look at
SEL-421 Relay operation status. You can perform often-used control actions
rapidly by using the large direct-action pushbuttons. All of these features help
you operate the relay from the front panel and include:
➤ Reading metering
➤ Inspecting targets
➤ Accessing settings
➤ Controlling relay operations
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