Sel 411L - Page 833

P.14.9
Date Code 20151029 Protection Manual SEL-411L Relay
SELOGIC Control Equation Programming
Multiple Setting Groups
Setting Groups:
Application Ideas
Setting groups can be used for such applications as:
➤ Environmental conditions such as winter storms, periods of
high summer heat, etc.
➤ Hot-line tag that disables closing and sensitizes protection
➤ Commissioning and operation
Active Setting Group
Indication
Only one setting group can be active at a time. Relay Word bits SG1–SG6
indicate the active setting group, as shown in Table 14.3.
For example, if setting Group 4 is the active setting group, Relay Word bit
SG4 asserts to logical 1, and the other Relay Word bits SG1, SG2, SG3, SG5,
and SG6 are all deasserted to logical 0.
Active Setting Group
Selection
The Global settings class contains the SELOGIC control equation settings
SS1–SS6, as shown in Table 14.4.
The operation of these settings is explained with the following example.
Assume the active setting group starts out as setting Group 3. Corresponding
Relay Word bit SG3 is asserted to logical 1 as an indication that setting
Group 3 is the active setting group.
With setting Group 3 as the active setting group, setting SS3 has priority. If
setting SS3 is asserted to logical 1, setting Group 3 remains the active setting
group, regardless of the activity of settings SS1, SS2, SS4, SS5, and SS6. With
settings SS1–SS6 all deasserted to logical 0, setting Group 3 still remains the
active setting group.
Table 14.3 Definitions for Active Setting Group Indication Relay Word Bits
SG1–SG6
Relay Word Bit Definition
CHSG Indication that a group switch timer is operating, or a group switch
change is underway.
SG1 Indication that setting Group 1 is the active setting group
SG2 Indication that setting Group 2 is the active setting group
SG3 Indication that setting Group 3 is the active setting group
SG4 Indication that setting Group 4 is the active setting group
SG5 Indication that setting Group 5 is the active setting group
SG6 Indication that setting Group 6 is the active setting group
Table 14.4 Definitions for Active Setting Group Switching SELOGIC Control
Equation Settings SS1–SS6
Setting Definition
SS1 go to (or remain in) setting Group 1
SS2 go to (or remain in) setting Group 2
SS3 go to (or remain in) setting Group 3
SS4 go to (or remain in) setting Group 4
SS5 go to (or remain in) setting Group 5
SS6 go to (or remain in) setting Group 6
NOTE: The settings group switching
settings are checked once per cycle.
When setting TGR := 0, in order for a
transient assertion to be recognized,
it should be conditioned to remain
asserted for at least one cycle.