Sel SEL-421 - Table 4.6 Actions at Settings Prompts

U.4.19
Date Code 20020501 User’s Guide SEL-421/SEL-421-1 Relay
Basic Relay Operations
Making Simple Settings Changes
When you exit settings entry from the SET commands, the relay responds,
“Save settings (Y,N) ?”. If you answer Y<Enter> (Yes), the relay writes the
new settings to nonvolatile storage. If you answer N <Enter> (No), the relay
discards any settings changes you have made.
Making Settings Changes: Initial Global Settings
You must configure the SEL-421 Relay for specific conditions found in the
power system where you are connecting the relay. In particular, you must set
the nominal frequency and phase rotation.
The procedure in the following steps assumes that you have successfully
established communication with the relay; see Making an EIA-232 Serial Port
Connection on page 4.6 for a step-by-step procedure. In addition, you must be
familiar with relay access levels and passwords. See Changing the Default
Passwords: Terminal on page 4.10 to change the default access level
passwords.
This example jumps to a Global setting that is not at the beginning of the
Global settings list. Thus, you enter SET G, the setting name, and <Enter>.
To start at the beginning of the Global settings, simply type SET G<Enter>
without a settings name.
Step 1. Prepare to control the relay at Access Level 2. Using a
communications terminal, type ACC<Enter>. Type the Access
Level 1 password and press <Enter>. You will see the =>
action prompt. Type the 2AC<Enter> command, and then type
the correct password to go to Access Level 2. You will see the
=>> action prompt.
Step 2. Set the nominal system frequency. Use the NFREQ setting,
which has options of 50 Hz and 60 Hz. Type SET G
NFREQ<Enter>. The relay responds with a terminal screen
display similar to the beginning of Figure 4.13.
Table 4.6 Actions at Settings Prompts
a
a
In this table, the ¿ symbol represents the Enter key <Enter>.
Action
a
Relay Response
¿
Accept setting and move to the next setting; if at the last setting, exit
settings.
[value]
¿ Enter the given value and move to the next setting if valid; if at the last
setting, exit settings.
^¿
Move to the previous setting; if at the top of settings, stay at the present
setting.
<¿
Move to the top of the previous settings category; if at the top of set-
tings, stay at the present setting.
>¿
Move to the top of the next settings category; if in the last category,
exit settings.
END¿
Go to the end of the present settings session. Prepare to exit settings
via the “Save settings (Y,N) ?” prompt.
<Ctrl+X>
Abort editing session without saving changes.