Date Code 20171021 Instruction Manual SEL-421 Relay
Instruction ManualInstruction Manual
SECTION 8
Settings
Section 12: Settings in the SEL-400 Series Relays Instruction Manual describes
common platform settings. This section contains tables of relay settings for the
SEL-421 Relay.
The relay hides some settings based upon other settings. If you set an enable set-
ting to OFF, for example, the relay hides all settings associated with that enable
setting. This section does not explain rules for hiding settings; these rules are dis-
cussed in the applications sections of the instruction manual where appropriate.
The settings prompts in this section are similar to the ASCII terminal and
ACSELERATOR QuickSet SEL-5030 software prompts. The prompts in this sec-
tion are unabbreviated and show all possible setting options.
For information on using settings in protection and automation, see the examples
in Section 6: Protection Applications Examples. The section contains informa-
tion on the following settings classes.
➤ Alias Settings on page 8.1
➤ Automation Freeform SELOGIC Control Equations on page 8.34
➤ Bay Settings on page 8.39
➤ Breaker Monitor Settings on page 8.9
➤ DNP3 Settings—Custom Maps on page 8.39
➤ Front-Panel Settings on page 8.35
➤ Global Settings on page 8.2
➤ Group Settings on page 8.12
➤ Notes Settings on page 8.34
➤ Output Settings on page 8.35
➤ Port Settings on page 8.38
➤ Protection Freeform SELOGIC Control Equations on page 8.34
➤ Report Settings on page 8.38
Alias Settings
See Alias Settings on page 12.20 in the SEL-400 Series Relays Instruction Man-
ual for a complete description of alias settings. Table 8.1 lists the default alias
settings for the SEL-421.
Isolate the relay trip circuits while
changing settings. When changing
settings for multiple classes, it is pos-
sible to be in an intermediate state
that will cause an unexpected trip.
Table 8.1 Global Settings Changes
Setting Default Value
EN RLY_EN
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