3.20
SEL-400 Series Relays Instruction Manual Date Code 20171006
Basic Relay Operations
Making Simple Settings Changes
When you exit settings entry from the SET commands, the relay responds with
Save settings (Y,N)?. If you answer Y <Enter>, the relay writes the new set-
tings to nonvolatile storage. If you answer N <Enter>, the relay discards any set-
tings changes you have made.
Making Settings Changes in Initial Global Settings
You must configure SEL-400 series relays for specific conditions found in the
power system where you are connecting the relay. For example, in most SEL-400
series relays you must set the nominal frequency and phase rotation.
The procedure in the following steps assumes that you have successfully estab-
lished communication with the relay; see Making an EIA-232 Serial Port Con-
nection on page 3.4 for a step-by-step procedure. In addition, you must be
familiar with relay access levels and passwords. See Changing the Default Pass-
words in the Terminal on page 3.10 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 set-
tings name.
Step 1. Prepare to control the relay at Access Level 2.
a. Using a communications terminal, type ACC <Enter>.
b. Type the Access Level 1 password and press <Enter>.
You will see the Access Level 1 => prompt.
Figure 3.15 Components of SET Commands
Table 3.5 Actions at Settings Prompts
Action Relay Response
<Enter> Accept setting and move to the next setting; if at the last setting, exit settings.
[value] <Enter> Enter the given value and move to the next setting if valid; if at the last set-
ting, exit settings.
^ <Enter> Move to the previous setting; if at the top of settings, stay at the present setting.
< <Enter> Move to the top of the previous settings category; if at the top of settings,
stay at the present setting.
> <Enter> Move to the top of the next settings category; if in the last category, exit settings.
END <Enter> Go to the end of the present settings session. Prepare to exit settings via
the
Save settings (Y,N) ? prompt.
<Ctrl+X> Abort the editing session without saving changes.
==>SET G <Enter>
Global
General Global Settings
Station Identifier (40 characters)
SID := "Station A"
? <Enter>
Relay Identifier (40 characters)
RID := "Relay 1"
? <Enter>
Number of Breakers in Scheme (1,2) NUMBK := 1 ? <Enter>
Category
Prompt
Present Value
Action Prompt
Present
Value
Prompt Action
Prompt
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