3.21
Date Code 20171006 Instruction Manual SEL-400 Series Relays
Basic Relay Operations
Making Simple Settings Changes
c. Type 2AC <Enter>.
d. Type the correct password to go to Access Level 2.
You will see the Access Level 2 =>> prompt.
Step 2. Type SET G NFREQ <Enter> (this sets the nominal system frequency
using the NFREQ setting, which has options of 50 Hz and 60 Hz).
The relay responds with a terminal screen display similar to that
shown in Figure 3.16.
Step 3. Accept the default settings.
a. For a 60 Hz system, press <Enter> to accept the NFREQ exist-
ing value of 60 (Hz).
The relay presents the next setting, which is the PHROT (phase
rotation) setting.
b. Type <Enter> to accept the ABC phase rotation default.
Step 4. Set the date format:
The relay can report dates in three formats: MDY, YMD, and DMY
(where M = month, D = date, and Y = year).
a. For this procedure, type YMD <Enter>.
At each setting in turn, the relay presents the settings prompt,
name, present value, and action prompt.
Note that SEL
OGIC control equation settings, such as FAULT in
Figure 3.16, can appear on multiple lines.
b. If you make a mistake or want to go backward through the
settings, type the ^ character (on most computer keyboards, this
is a shifted numeral 6) and <Enter>.
Refer to Table 3.5 for this and other navigational aids.
Step 5. End the settings session.
a. Type END <Enter> at the
FAULT action prompt.
(The Fault SEL
OGIC control equation remains unchanged.)
The relay next scrolls a readback of all the Global settings,
eventually displaying the following prompt:
Save settings (Y,N) ?
(In Figure 3.16, a vertical ellipsis represents the relay
information during readback.)
b. Examine the settings readback to verify your new settings.
c. Answer Y <Enter> to save your new settings.
=>>SET G NFREQ <Enter>
Global
General Global Settings
Nominal System Frequency (50,60 Hz) NFREQ := 60 ? <Enter>
System Phase Rotation (ABC,ACB) PHROT := ABC ? <Enter>
Date Format (MDY,YMD,DMY) DATE_F := MDY ? YMD <Enter>
Fault Condition Equation (SELogic Equation)
FAULT := 51S1 OR 51S2 OR 50P1
? END <Enter>
•
•
•
Save settings (Y,N) ? Y <Enter>
Saving Settings, Please Wait...........
Settings Saved
=>>
Figure 3.16 Example Global Settings
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