R.3.9
Date Code 20111215 Reference Manual SEL-421 Relay
SELOGIC Control Equation Programming
Multiple Setting Groups
➤ Selected with SELOGIC control equation settings SS1 through
SS6. Settings SS1 through SS6 have priority over all other
selection methods. Use remote bits in these equations to select
setting groups with Fast Operate commands as described in
SEL Fast Meter, Fast Operate, and Fast SER Messages on
page R.5.8.
➤ Shown with DNP3 Objects 20 and 22 as described in
Table 6.10 on page R.6.17 and selected with Objects 40 and 41.
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 through
SG6 indicate the active setting group, as shown in Table 3 .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
through SS6, as shown in Table 3.4.
Table 3.3 Definitions for Active Setting Group Indication Relay Word Bits
SG1 Through 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 3.4 Definitions for Active Setting Group Switching SELOGIC Control
Equation Settings SS1 Through 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.
NOTE: The SEL-421-1 and the
SEL-421-2 have only one 100-line
automation programming block.
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