P.14.24
SEL-411L Relay Protection Manual Date Code 20151029
SELOGIC Control Equation Programming
SEL
OGIC Control Equation Operators
#
# The counter automatically resets every 1,000 operations
PCN01PV := 1000
PCN01R := PCN01Q
PCN01IN := PSV03 # Count open and close operations
PSV04 := PCN01CV >900 # PSV04 signals impending reset
Aliases
Although the relay provides extensive programming facilities and opportunity
for comments, troubleshooting customized programs is sometimes difficult.
Aliases provide an opportunity to assign more meaningful names to the
generic variable names in order to improve the readability of the program.
Example 14.10 provides examples of assigning aliases.
EXAMPLE 14.10 Assigning and Removing Aliases
The following free-form math SEL
OGIC control equations show you
how to create aliases.
# Assign the alias names with the SET T command.
SET T.
PMV01,THETA # Assign the alias “THETA” to PMV01.
PMV02,TAN # Assign the alias “TAN” to PMV02.
Use the alias names “THETA” and “TAN“ in a free-form SELOGIC
control equation:
# Calculate the tangent of THETA.
TAN := SIN(THETA)/COS(THETA)
To remove the alias from the alias setting, issue the SET T command
and press <Enter> until the alias appears; then type DELETE <Enter>:
SET T.
nn: PMV01,THETA # (where nn = line number).
DELETE.
Assign as many as 200 alias names to any Relay Word bit or analog quantity,
using the SET T command. The maximum length of an alias is seven
characters. Valid characters are 0–9, A–Z (only uppercase) and _ (underscore).
Make sure no Relay Word bit or analog quantity appears more than once in the
alias settings. Each alias name must be unique, i.e., you cannot use the name
of an existing Relay Word bit or analog quantity. If you remove the alias
name, all settings that referenced that alias revert to the original name.
SELOGIC Control Equation Operators
There are two types of SELOGIC control equations. Boolean SELOGIC control
equations comprise the first type. These equations are expressions that
evaluate to a Boolean value of 0 or 1. Math SEL
OGIC control equations
constitute the second type. The relay evaluates these equations to yield a result
having a numerical value (for example, 6.25 or 1055).
Left value, LVALUE, determines the type of SEL
OGIC control equation you
need for a setting or for writing free-form programming. If the LVALUE is a
Boolean type (52AA1, ASV001, etc.) then the type of expression you need is
a Boolean SEL
OGIC control equation. If the LVALUE is a numerical (non-
Boolean) value (PMV12, PCT01PV, etc.), the type of expression you need is a
math SEL
OGIC control equation.
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