P.14.11
Date Code 20151029 Protection Manual SEL-411L Relay
SELOGIC Control Equation Programming
SEL
OGIC Control Equation Elements
The relay will reject any setting that exceeds the available settings storage
capacity and execution capacity. You can then accept the previous settings you
have entered and examine your settings.
Protection
The relay provides storage space for as many as 250 lines of protection free-
form programming. Because the relay executes protection fixed and free-form
logic at a deterministic interval, there is a limit to the amount of SEL
OGIC
control equation programming that the relay can execute. The relay calculates
total capacity in terms of settings capacity and execution capacity.
Rather than limit parameters to guarantee that your application not exceed the
maximum processing requirements, the relay measures and calculates the
available capacity when you enter SEL
OGIC control equations. The relay will
not allow you to enter programming that will cause the relay to be unable to
complete all protection SEL
OGIC control equations each protection processing
interval.
There are six protection settings groups that can be active. When a protection
settings group is active, the relay executes SEL
OGIC control equations in the
Global Settings, Protection Group Settings, Protection Free-Form Settings,
Output Settings, and several other settings areas. The relay calculates
protection capacities based on the total amount of SEL
OGIC control equation
programming executed when the protection settings group is active. Use the
STATUS S command to display the remaining settings capacity and execution
capacity for protection fixed and free-form logic.
Automation
The relay provides storage space for 10 blocks of as many as 100 lines of
automation free-form programming each. The relay executes automation
programming differently than protection logic programming. The result is that
automation free-form logic execution time varies with the amount of free-
form logic expressions that you enter. As you enter more expressions, the time
required for the relay to execute all expressions increases. You can display the
peak and average execution time using the STATUS S command.
Because automation runs at a slower rate than protection, you must be careful
when using protection bits within automation equations. Protection bits can
assert and deassert again too fast for automation to equations to consistently
see them. Therefore, you may need to hold protection bits asserted for a
second, by using conditioning timers, before using them in SEL
OGIC
equations.
There is a maximum execution capacity and settings storage capacity. If you
enter a setting that exceeds maximum capacity, the relay will reject the setting.
You will have the opportunity to reenter the setting or save any other settings
you entered during that session.
SELOGIC Control Equation Elements
SELOGIC control equation elements are a collection of storage locations,
timers, and counters that you can use to customize the operation of your relay
and use the relay to automate substation operation. The elements that you can
use in SEL
OGIC control equations are summarized in Table 14.5.
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