3-20 Communications Date Code 20011026
SEL-321/321-1 Instruction Manual
While entering settings, press <ENTER> to retain an existing setting, and to move to the next
setting. Press ^ <ENTER> to retain an existing setting and to move to the previous setting.
Press < <ENTER> to move to the first setting of the previous family. Press > <ENTER> to
move to the first setting of the next family. To flag a setting as Not Applicable, type OFF
<ENTER>.
The relay checks each entry to ensure that it is within the allowable input range. If it is not, an
"Out of Range" message is generated, and the relay prompts for the setting.
When you finish a setting, it is not necessary to scroll through the remaining settings. Type END
<ENTER> after your last change to display the new settings and enable prompt.
After you enter all data, the relay displays the new settings and prompts for approval to enable
them. Answer Y <ENTER> to approve the new settings. If you violate a rule for setting
relationships, a fail message in Table 3.7 is displayed, and the settings prompt moves to the first
setting that affects the failure. If settings are acceptable, the relay saves them. If a logic scheme
was enabled which requires inputs assigned, a warning message in Table 3.8 is displayed. Assign
the inputs with the SET G command. While the active settings are updated, the relay is disabled
and the ALARM output contacts close and all timers and relay elements reset.
Table 3.7: Group SET Fail Messages
SET (Groups) Comment
UBEND must be less than UBDURD. Settings for UBEND or UBDURD timers
improperly set.
Z2F must be less than Z2R by at least 0.1
ohms.
Z2F and/or Z2R are improperly set in setting
procedure.
OSTD must be less than OSBD. OSTD or OSBD entered wrong in setting
procedure.
DIR3 must be R since POTT, DCUB, or DCB
is enabled.
DIR3 not set to R in setting procedure.
DIR2 must be F since POTT, DCUB, or DCB
is enabled.
DIR2 not set to F in setting procedure.
PLAR must be less than or equal to NLAR. PLAR or NLAR set incorrectly in setting
procedure.
PLAF must be greater than or equal to NLAF. PLAF or NLAF set incorrectly in setting
procedure.
Time dial setting out of range for selected
curve family.
Curve family changed without updating time
dial.
X1T must be at least 0.1 Ω greater than X1B. X1T not set at least 0.1 Ω greater than X1B.
R1R must be at least 0.1 Ω greater than R1L. R1R must be at least 0.1 Ω greater than R1L.
Enabled distance element must not be OFF. Previously disabled distance element must be
given a value.
Enabled supervisory element must not be
OFF.
Previously disabled supervisory element must
be given a value.
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