P.14.10
SEL-411L Relay Protection Manual Date Code 20151029
SELOGIC Control Equation Programming
SEL
OGIC Control Equation Capacity
With setting Group 3 as the active setting group, if setting SS3 is deasserted to
logical 0 and one of the other settings (e.g., setting SS5) asserts to logical 1,
the relay switches from setting Group 3 as the active setting group to another
setting group (e.g., setting Group 5) as the active setting group, after
qualifying time setting TGR (Global settings):
In this example, TGR qualifies the assertion of setting SS5 before it can
change the active setting group. Relay Word bit CHSG asserts when the TGR
timer is picked-up and timing, and also when a setting group change has been
initiated.
Active Setting Group
Changes
The relay is disabled for less than 1 second while in the process of changing
active setting groups. Relay elements, timers, and logic are reset, unless
indicated otherwise in the specific logic description. For example, local bit
(LB01–LB32), remote bit (RB01–RB32), and latch bit (PLT01–PLT32) states
are retained during an active setting group change. The output contacts do not
change state until the relay enables in the new settings group and the SEL
OGIC
control equations are processed to determine the output contact status for the
new group.
After a group change, an automatic message will be sent to any serial port that
has setting AUTO := Y. See Table 2.4
Active Setting:
Nonvolatile State
Power Loss
The active setting group is retained if power to the relay is lost and then
restored. If a particular setting group is active (e.g., setting Group 5) when
power is lost, the same setting group is active when power is restored.
Settings Change
If individual settings are changed for the active setting group or one of the
other setting groups, the active setting group is retained, much like in the
preceding explanation.
If individual settings are changed for a setting group other than the active
setting group, there is no interruption of the active setting group, so the relay
is not momentarily disabled.
If the individual settings change causes a change in one or more SEL
OGIC
control equation settings SS1–SS6, the active setting group can be changed,
subject to the newly enabled SS1–SS6 settings.
SELOGIC Control Equation Capacity
SELOGIC control equation capacity is a measure of how much remaining
space you have available for programming. In both protection and automation,
SEL
OGIC control equation capacity includes execution capacity and settings
storage capacity.
TGR Group Change
Delay Setting
(settable from 0 to 54000 cycles)
NOTE: The CHSG Relay Word bit
does not operate for settings changes
initiated by the serial port or front-
panel methods.
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